Exhibit 99.1

PRELIMINARY NOTES

In this Annual Information Form (“ AIF ”), Alexco Resource Corp. is referred to as the “ Corporation ” or “ Alexco ”. All information contained herein is as at and for the year ended December 31, 2017, unless otherwise specified. All dollar amounts in this AIF are expressed in Canadian dollars unless otherwise indicated.

Cautionary Statement Regarding Forward-Looking Statements

This AIF contains forward-looking statements within the meaning of the United States Private Securities Litigation Reform Act of 1995 and forward-looking information within the meaning of applicable Canadian securities laws (together, “ forward-looking statements ”) concerning the Corporation's business plans, including but not limited to anticipated results and developments in the Corporation’s operations in future periods, planned exploration and development of its mineral properties, plans related to its business and other matters that may occur in the future, made as of the date of this AIF. Forward-looking statements may include, but are not limited to, statements with respect to amendments to the silver purchase agreement (“ SPA ” or the “ Silver Purchase Agreement ”) with Wheaton Precious Metals Corp. (“ Wheaton ”) and its impact on the Corporation, the resulting effect on pricing and other terms of the SPA, additional capital requirements to fund further exploration and development work on the Corporation's properties, future remediation and reclamation activities, future mineral exploration, the estimation of mineral reserves and mineral resources, the realization of mineral reserve and mineral resource estimates, future mine construction and development activities, future mine operation and production, the timing of activities, the amount of estimated revenues and expenses, the success of exploration activities, permitting time lines, requirements for additional capital and sources and uses of funds. Any statements that express or involve discussions with respect to predictions, expectations, beliefs, plans, projections, objectives, assumptions or future events or performance (often, but not always, using words or phrases such as “expects”, “anticipates”, “plans”, “estimates”, “intends”, “strategy”, “goals”, “objectives” or stating that certain actions, events or results “may”, “could”, “would”, “might” or “will” be taken, occur or be achieved, or the negative of any of these terms and similar expressions) are not statements of historical fact and may be “forward-looking statements”.

Forward-looking statements are subject to a variety of known and unknown risks, uncertainties and other factors which could cause actual events or results to differ from those expressed or implied by the forward-looking statements. Such factors include, but are not limited to, risks related to actual results and timing of exploration and development activities; actual results and timing of mining activities; actual results and timing of environmental services operations; actual results and timing of remediation and reclamation activities; conclusions of economic evaluations; changes in project parameters as plans continue to be refined; future prices of silver, gold, lead, zinc and other commodities; possible variations in resources, grade or recovery rates; failure of plant, equipment or processes to operate as anticipated; accidents, labour disputes and other risks of the mining industry; First Nation rights and title; continued capitalization and commercial viability; global economic conditions; competition; delays in obtaining governmental approvals or financing or in the completion of development activities, and inability of the Company to obtain additional financing needed to fund certain contingent payment obligations on reasonable terms or at all . Furthermore, forward-looking statements are statements about the future and are inherently uncertain, and actual achievements of the Corporation or other future events or conditions may differ materially from those reflected in the forward-looking statements due to a variety of risks, uncertainties and other factors, including but not limited to those referred to in this AIF under the heading “Risk Factors” and elsewhere.

Forward-looking statements are based on certain assumptions that management believes are reasonable at the time they are made. In making the forward-looking statements included in this AIF, the Corporation has applied several material assumptions, including, but not limited to, the assumption that: (1) additional financing needed to fund certain contingent payment obligations to Wheaton; (2) additional financing needed for the capacity related refund under the SPA with Wheaton will be available on reasonable terms; (3) additional financing needed for further exploration and development work on the Corporation's properties will be available on reasonable terms; (4) the proposed development of its mineral projects will be viable operationally and economically and proceed as planned; (5) market fundamentals will result in sustained silver, gold, lead and zinc demand and prices, and such prices will not be materially lower than those estimated by management in preparing the annual financial statements for the year ended December 31, 2017; (6) market fundamentals will result in sustained silver, gold, lead and zinc demand and prices, and such prices will be materially consistent with or more favourable than those anticipated in the Preliminary Economic Assessment (“ PEA ”) (as defined under "Description of the Business – KHSD Property"); (7) the actual nature, size and grade of its mineral resources are materially consistent with the resource estimates reported in the supporting technical reports; (8) labor and other industry services will be available to the Corporation at prices consistent with internal estimates; (9) the continuances of existing and, in certain circumstances, proposed tax and royalty regimes; and (10) that other parties will continue to meet and satisfy their contractual obligations to the Corporation. Statements concerning mineral reserve and resource estimates may also be deemed to constitute forward-looking information to the extent that they involve estimates of the mineralization that will be encountered if the property is developed. Other material factors and assumptions are discussed throughout this AIF and, in particular, under the heading “Risk Factors” .

The Corporation's forward-looking statements are based on the beliefs, expectations and opinions of management on the date the statements are made and should not be relied on as representing the Corporation's views on any subsequent date. While the Corporation anticipates that subsequent events may cause its views to change, the Corporation specifically disclaims any intention or any obligation to update forward-looking statements if circumstances or management's beliefs, expectations or opinions should change, except as required by applicable law. For the reasons set forth above, investors should not place undue reliance on forward-looking statements.

Cautionary Note to U.S. Investors – Information Concerning Preparation of Resource Estimates

This AIF has been prepared in accordance with the requirements of the securities laws in effect in Canada, which differ from the requirements of United States securities laws. The terms “mineral reserve”, “proven mineral reserve” and “probable mineral reserve” are Canadian mining terms as defined in accordance with Canadian National Instrument 43-101 – Standards of Disclosure for Mineral Projects (“ NI 43-101 ”) and the Canadian Institute of Mining, Metallurgy and Petroleum (the “ CIM ”) – CIM Definition Standards on Mineral Resources and Mineral Reserves , adopted by the CIM Council, as amended. These definitions differ materially from the definitions in the United States Securities and Exchange Commission’s (“ SEC ”) Industry Guide 7 under the United States Securities Act of 1933, as amended. Under SEC Industry Guide 7 standards, mineralization cannot be classified as a “reserve” unless the determination has been made that the mineralization could be economically and legally extracted at the time the reserve determination is made. As applied under SEC Industry Guide 7, a “final” or “bankable” feasibility study is required to report reserves, the three-year historical average price is used in any reserve or cash flow analysis to designate reserves, and the primary environmental analysis or report must be filed with the appropriate governmental authority.

In addition, the terms “mineral resource”, “measured mineral resource”, “indicated mineral resource” and “inferred mineral resource” are defined in and required to be disclosed by NI 43-101; however, these terms are not defined terms under SEC Industry Guide 7 and are normally not permitted to be used in reports and registration statements filed with the SEC. Investors are cautioned not to assume that all or any part of a mineral deposit in these categories will ever be converted into SEC Industry Guide 7 reserves. “Inferred mineral resources” have a great amount of uncertainty as to their existence, and great uncertainty as to their economic and legal feasibility. It cannot be assumed that all or any part of an inferred mineral resource will ever be upgraded to a higher category. Under Canadian rules, estimates of inferred mineral resources may not form the basis of feasibility or pre-feasibility studies, except in rare cases. Investors are cautioned not to assume that all or any part of an inferred mineral resource exists or is economically or legally mineable. It is reasonably expected that the majority of inferred mineral resources could be upgraded to indicated mineral resources with continued exploration. Disclosure of “contained ounces” in a resource is permitted disclosure under Canadian regulations; however, the SEC normally only permits issuers to report mineralization that does not constitute “reserves” by SEC Industry Guide 7 standards as in place tonnage and grade without reference to unit measures.

Accordingly, information concerning mineral deposits contained in this AIF may not be comparable to similar information made public by U.S. companies subject to the reporting and disclosure requirements under the United States federal securities laws and the rules and regulations thereunder, including SEC Industry Guide 7.

Qualified Person Under NI 43-101

Except where specifically indicated otherwise, the disclosure in this AIF of scientific and technical information regarding exploration projects on Alexco’s mineral properties has been reviewed and approved by Alan McOnie, FAusIMM, Vice President, Exploration, while that regarding mine development and operations has been reviewed and approved by Neil Chambers, P.Eng., Mine Superintendent , both of whom are Qualified Persons as defined by NI 43-101.

CORPORATE STRUCTURE

The Corporation was incorporated under the Business Corporations Act (Yukon) on December 3, 2004 under the name “Alexco Resource Corp.” Effective December 28, 2007, it was continued under the Business Corporations Act (British Columbia).

The Corporation's head office is located at Suite 1225, Two Bentall Centre, 555 Burrard Street, Box 216, Vancouver, British Columbia, V7X 1M9, Canada, and its registered and records office is located at 10th Floor, 595 Howe Street, Vancouver, British Columbia, V6C 2T5, Canada.

At the end of its most recently completed financial year, the Corporation had the following wholly-owned subsidiaries:

Unless otherwise indicated or the context otherwise requires, reference to the term the “Corporation” or “Alexco” in this AIF includes Alexco Resource Corp. and its subsidiaries.

GENERAL DEVELOPMENT OF THE BUSINESS

Formation of the Corporation

In 2005, the Corporation completed a series of transactions pursuant to which it acquired a number of mineral property interests and rights to certain operating contracts in Yukon Territory and British Columbia, the most significant of which properties are located in Yukon Territory’s Keno Hill Silver District.

Alexco operates two principal businesses: (i) a mining business, comprised of mineral exploration and mine development and operation in Canada, primarily in Yukon Territory; and (ii) through its Alexco Environmental Group Division (through AEG Canada and AWE), provision of a variety of mine and industrial site related environmental services including management of the regulatory and environmental permitting process, environmental assessments, and reclamation and closure planning in Canada, the United States and elsewhere.

Three Year History and Significant Acquisitions

In June 2005, the Corporation was selected as the preferred purchaser of the assets of United Keno Hill Mines Limited and UKH Minerals Limited (collectively, “ UKHM ”) by a court appointed interim receiver and receiver-manager of UKHM. In February 2006, following negotiation of a subsidiary agreement (the “ Subsidiary Agreement ”) between the Government of Canada, the Government of Yukon (collectively, the “ Government Group ”) and the Corporation, the Supreme Court of Yukon conditionally approved the purchase of the assets of UKHM by Alexco through its wholly-owned subsidiary, ERDC, final closing of which acquisition was effected in December 2007. Under the terms of the Subsidiary Agreement, the Corporation is indemnified by the Government of Canada for all liabilities, including environmental liabilities, arising directly or indirectly as a result of the pre-existing condition of the Keno Hill mineral rights and other assets acquired from UKHM. The Subsidiary Agreement provides that ERDC may bring any mine into production on the UKHM Mineral Rights (as hereinafter defined) by designating a production unit from the mineral rights relevant to that purpose and then assuming responsibility for all costs of the production unit’s water related care and maintenance and water related components of closure reclamation. The Subsidiary Agreement further requires ERDC to pay into a separate reclamation trust a 1.5% net smelter return royalty, up to an aggregate maximum of $4 million for all production units, from any future production from the UKHM Mineral Rights, commencing once earnings from mining before interest, taxes and depreciation exceed actual exploration costs, up to a maximum of $6.2 million, plus actual development and construction capital.

Also under the Subsidiary Agreement, ERDC is retained through the Government Group as a paid contractor responsible on a continuing basis for the environmental care and maintenance and ultimate closure reclamation of the former UKHM Mineral Rights. The original Subsidiary Agreement provided that ERDC was responsible for the development of the ultimate closure reclamation plan for fees of 65% of agreed commercial contractor rates, and this plan development is currently ongoing. Upon acceptance and regulatory approval, the closure reclamation plan will be implemented by ERDC at full agreed commercial contractor rates. During the period required to develop the plan, the original Subsidiary Agreement also provided that ERDC was responsible for carrying out the environmental care and maintenance of the UKHM Mineral Rights for a reducing fixed annual fee adjusted each year for certain operating and inflationary factors.

In July 2013, an amended and restated Subsidiary Agreement (the “ ARSA ”) was executed with the Government of Canada. Recognizing that developing the closure reclamation plan is more complicated than originally anticipated, the ARSA provides for the Government of Canada to contribute a higher proportion of closure plan development costs than provided for under the Subsidiary Agreement, retroactive to 2009. Going forward, ERDC will receive 95% of agreed commercial contractor rates for ongoing development of the closure reclamation plan. Furthermore, with respect to care and maintenance activity during the closure reclamation planning phase, the original reducing fee scale is replaced by a fixed fee of $850,000 per year, representing approximately 50% of estimated fully-billable care and maintenance fees.

Since 2006, the Corporation has carried out exploration activities on several of its properties within the Keno Hill District, with a significant component of that activity having been focused on the Bellekeno property and the Bellekeno mine, which commenced commercial production effective January 1, 2011.

Under terms of the original Silver Purchase Agreement (entered into on October 2, 2008 and subsequently amended on October 20, 2008, December 10, 2008, December 22, 2009, March 31, 2010, January 15, 2013, March 11, 2014 and June 16, 2014, respectively):

In light of a sharply reduced silver price environment, Bellekeno mining operations were suspended as of September 30, 2013.

On March 29, 2017 the Corporation and certain of its subsidiaries and Wheaton entered into an amendment agreement to the Silver Purchase Agreement (the “Amended SPA”) pursuant to which, among other things, the following amendments were made to the Silver Purchase Agreement:

In consideration of the foregoing amendments, the Corporation issued 3,000,000 shares to Wheaton with a fair value of US$4,934,948 .

In addition to the mining business described above, the Corporation also operates an environmental services business through its Alexco Environmental Group division (“ AEG ”). Primarily through AEG Canada, AWE and ERDC, AEG provides a variety of mine and industrial site related environmental services including management of the regulatory and environmental permitting process, environmental assessments and reclamation and closure planning. AEG operations also include the care and maintenance and closure reclamation activities being conducted by the Corporation in the Keno Hill District under the Subsidiary Agreement. Alexco also owns certain patents (the “ Patents ”) registered or in the process of being registered in the U.S., Canada and various other countries around the world, with terms that expire variously between 2017 and 2020. The Patents generally pertain to the in-situ immobilization of metals, and are specifically suited to mine closure related remediation.

Further particulars relating to the business of AEG, including activities being conducted under the Subsidiary Agreement, are described below under “Description of the Business – Environmental Services”.

On December 8, 2015, the Corporation completed an underwritten private placement of 5,662,500 flow-through common shares at a price of C$0.53 per share for gross proceeds of $3,001,125. The underwriter, Canaccord Genuity Corp., received a cash commission of $195,073 representing 6.5% of the gross proceeds, as well as 368,062 underwriter’s warrants, with each underwriter’s warrant entitling the holder to purchase one common share at a price of C$0.53 until December 8, 2017. These warrants were exercised in full prior to expiry.

On December 8, 2015, the Corporation also completed a concurrent non-brokered private placement of 2,000,000 common shares at a price of $0.48 per share for gross proceeds of $960,000, for which the Corporation paid a finder’s fee of $57,600.

On May 17, 2016, the Corporation completed a non-brokered private placement of 10,839,972 units at a price of $1.20 per unit for aggregate gross proceeds of $13,007,966. Each unit consisted of one common share and one-half of one non-transferable common share purchase warrant, each whole such warrant entitling the holder to purchase one additional common share of the Corporation at a price of $1.75 per share until May 17, 2018. If, following September 18, 2016, the closing price of Corporation’s common shares on the Toronto Stock Exchange is higher than $2.50 for a period of 10 consecutive trading days (the “ Trigger Date ”), the expiry date of these warrants may be accelerated to the date that is 10 trading days after the Trigger Date by the issuance of a news release within two trading days of the Trigger Date announcing such acceleration (the “ Acceleration Provision ”). The Corporation paid Sprott Private Wealth LP and certain of its affiliates a cash commission equal to the 5% of the gross proceeds from the sale of 7.51 million units and issued an aggregate of 225,300 finder’s warrants, each of which is exercisable for one common share of the Corporation at a price of $1.49 until May 17, 2018, subject to the Acceleration Provision. The Corporation also paid finder’s fees in the aggregate amount of $176,110 to other arm’s length finders, representing a cash commission equal to 5% of the gross proceeds received in respect of the sale of 2.94 million units to purchasers introduced to the Corporation by such finders.

On May 30, 2017, the Corporation completed an underwritten private placement of 4,205,820 “flow-through” common shares at a price of $2.15 per share for gross proceeds of $9,042,513. The underwriter, Canaccord Genuity Corp., received a cash commission of $542,550 representing 6% of the gross proceeds, as well as 126,174 underwriter’s warrants, with each underwriter’s warrant entitling the holder to purchase one common share at a price of $2.15 until May 30, 2019.

On February 26, 2018, the Corporation announced that it had entered into a credit agreement with Sprott Private Resource Lending (Collector), L.P. to provide a US$15,000,000 credit facility to be used for the development of the Keno Hill Project. The facility is available for drawdown for a period of 12 months and matures February 23, 2021 and bears an interest rate on the funds drawn down equal to the greater of (a) a fixed rate of 8% per annum, calculated daily and compounded monthly; and (b) a floating rate equal to 7% per annum plus LIBOR, calculated and compounded monthly. In consideration for providing the credit facility, the Corporation issued to the lender 1,000,000 warrants, each warrant exercisable for one common share of the Corporation at an exercise price of $2.25 until February 23, 2023, subject to the Corporation’s right to accelerate the expiry date of the warrants on not less than 30 days’ notice in the event that the closing price of the Corporation’s common shares on the Toronto Stock Exchange is greater than $5.625 for a period of more than 20 consecutive trading days.

DESCRIPTION OF THE BUSINESS

The Corporation operates two principal businesses: a mining business, comprised of mineral exploration and mine development and operation in Canada, primarily in Yukon Territory; and through AEG an environmental services business, providing consulting, remediation solutions and project management services in respect of environmental permitting and compliance and site remediation, in Canada, the United States and elsewhere.

At December 31, 2017, the Corporation had 79 permanent and seasonal employees. A total of 31 were employed in the care and maintenance of the Bellekeno mine and mill site care and maintenance, a further 8 were employed in mineral exploration and evaluation activities. A total of 31 were employed in the environmental services business, with the remaining 9 employed in respect of executive management and administrative support. Significant aspects of both the mining business and the environmental services business require specialized skills and knowledge in areas that include geology, mining, metallurgy, engineering, environmental contamination treatment, permitting and regulatory compliance, as well as environmental and social policy issues. Any re-start of Alexco’s mining operations will necessitate the hiring of additional mine and mill personnel.

Mining Business

The Corporation's principal mining business activities are currently being carried out within the Keno Hill District in Yukon Territory. The Keno Hill District (the " District ") is a storied silver mining region in Canada, encompassing over 35 former mines that produced variously from approximately 1918 through 1988, with published information from the Yukon Government’s Minfile database reporting more than 217 million ounces of silver produced at average grades of 44.7 ounces per tonne silver, 5.6% lead and 3.1% zinc.

The Corporation’s mineral property holdings within the Keno Hill district cover the most prospective geological areas to host silver mineralization, including all of the significant historic producing former mines and most of the other mineral occurrences. In addition to the deposits described below that are within the Keno Hill Silver District (“KHSD”) as detailed in the PEA, the Corporation holds several other less advanced property interests within the District, including but not limited to the Silver King, Elsa, Husky, Sadie Ladue and McQuesten properties, which potentially could become material properties depending on the results of exploration programs the Corporation may carry out on them in the future, as well as the separate Elsa Tailings Property (see technical report dated June 16, 2010, entitled “Mineral Resource Estimation, Elsa Tailings Project ,Yukon, Canada”) .  In aggregate, Alexco’s mineral rights and holdings within the Keno Hill District currently comprise 725 surveyed quartz mining leases, 846 unsurveyed quartz mining claims, eight (8) placer claims and two (2) crown grants, in addition to five (5) fee simple lots and seven (7) surface leases.  Of those, the mineral rights acquired from UKHM (the “ UKHM Mineral Rights ”) and therefore subject to the capped 1.5% net smelter return royalty provided for under the Subsidiary Agreement (see “General Development of the Business – Three Year History and Significant Acquisitions”) total 676 quartz mining leases, 121 quartz mining claims and two crown grants.

Other non-material mineral property interests of the Corporation include Harlan properties in the Yukon, and certain net smelter return royalties in respect of the Brewery Creek, Ida-Oro (formerly Klondike) and Sprogge properties in the Yukon and the Telegraph Creek, Iskut River, Kiniskan Lake and Manson Creek properties in British Columbia.

KHSD Property

The Corporation’s KHSD property (as detailed in the PEA) encompasses the Flame & Moth, Bermingham, Lucky Queen, Bellekeno and Onek deposits and comprises 703 surveyed quartz mining leases and 866 unsurveyed quartz mining claims and two Crown Grants, of which about half of the tenements are UKHM derived rights.

An independent technical report dated March 29, 2017 with an effective date of January 3, 2017as amended on September 14, 2018 prepared by Roscoe Postle Associates Inc. (" RPA ") entitled "Preliminary Economic Assessment of the Keno Hill Silver District Project, Yukon, Canada" (the " PEA ") was filed and is available on SEDAR under the Corporation's profile at www.sedar.com .

Attached as Schedule "A" to this AIF is the summary contained in the PEA , which summary has been updated and conformed to be consistent with other disclosure within this AIF.

The detailed disclosure contained in the PEA is hereby incorporated by reference. It is noted that the PEA contains references and/or assumptions relating to the dates for re-starting or continuing mining operations or development work at certain of Alexco's mineral properties. Notwithstanding the incorporation by reference herein of the PEA and reproduction of the summary section in Schedule “A” hereto, such dates were projections made at the time the PEA was prepared and are not necessarily reflective of Alexco's current plans. Re-start of mining operations and/or development work is dependent on a number of factors, including sustained improvements in silver markets and the effectiveness of cost structure reduction measures. Accordingly, there is no certainty as to when these factors will be achieved.

Environmental Services

General

The Corporation’s environmental services division, AEG, is in the business of managing risk and unlocking value at mature, closed or abandoned sites through integration and implementation of the Corporation's core competencies, which include management of environmental services, implementation of innovative treatment technologies, execution of site reclamation and closure operations, and, if appropriate, rejuvenation of exploration and development activity. The Corporation’s principal markets for these services are in Canada, the United States and the Americas, with the Canadian market serviced primarily through AEG Canada and ERDC, the U.S. market through AWE, and the balance of the Americas through either AEG Canada or AWE. The Corporation provides its services to a range of industrial sectors, but with a particular focus on current and former mine sites.

The Corporation offers its clients a unique combination of environmental remediation expertise in the area of site reclamation and closure, an ability to manage complex permitting and regulatory programs on a turnkey basis, and strong operations management. In addition, the Corporation seeks to strategically leverage off its environmental services group, accessing opportunities to enhance asset value through effective liability risk management and efficient site operations. This is accomplished through unlocking potential exploration and development opportunities at contaminated or abandoned sites through cost effective and responsible environmental remediation and liability transfer.

The Corporation executes its environmental services business plan by using and applying the intellectual property assets, including the Patents, and the specialized skill sets and knowledge it maintains in-house. While there are a significant number of firms providing environmental services in North America, these assets, skill sets and knowledge provide Alexco with a strong competitive advantage. Consolidated revenue from environmental services for the year ended December 31, 2017 totaled $10,732,000, compared to $11,361,000 in 2016, all of which was derived from sales to external unrelated parties. During the year ended December 31, 2017, the Corporation recorded revenues from three customers representing 10% or more of total environmental services revenue, in the amounts of $3,419,000, $1,702,000 and $1,473,000. During 2016, AEG had three customers representing 10% or more of total revenue, in the amounts of $3,220,000, 3,044,000 and $1,746,000. AEG’s largest single customer is the Government of Canada, with a substantial component of Government revenues earned from the Government of Canada’s Indian and Northern Affairs Canada.

Keno Hill Project

As described above (see “General Development of the Business – Three Year History and Significant Acquisitions”), under the Subsidiary Agreement, Alexco’s subsidiary ERDC was retained through the Government Group as a paid contractor responsible on a continuing basis for the environmental care and maintenance and ultimate closure reclamation of the former UKHM Mineral Rights.

Pursuant to the Subsidiary Agreement, ERDC shares the responsibility for the development of the ultimate closure reclamation plan with the Government of Canada, for which it would receive fees of 65% of agreed commercial contractor rates, and this plan development is currently ongoing. Upon acceptance and regulatory approval, the closure reclamation plan will be implemented by ERDC at full agreed contractor rates. During the period required to develop the plan and until the closure plan is executed, ERDC is also responsible for carrying out the environmental care and maintenance at various sites within the UKHM Mineral Rights, for a fixed annual fee adjusted each year for certain operating and inflationary factors and determined on a site-by-site basis. Under the Subsidiary Agreement, the portion of the annual fee amount so determined which was billable by ERDC in respect of each site reduced by 15% each year until all site-specific care and maintenance activities were replaced by closure reclamation activities; provided however that should a closure reclamation plan be prepared but not accepted and approved, the portion of annual fees billable by ERDC would revert to 85% until the Subsidiary Agreement was either amended or terminated. ERDC receives agreed commercial contractor rates when retained by the Government Group to provide environmental services in the Keno Hill District outside the scope of care and maintenance and closure reclamation planning under the Subsidiary Agreement. As a result of these terms, the Corporation has previously recognized an environmental services contract loss provision to reflect aggregate future losses estimated to be realized with respect to care and maintenance activity during the closure planning phase.

In July 2013, the Corporation executed an amended and restated Subsidiary Agreement, the ARSA, with the Government of Canada. Recognizing that developing the closure reclamation plan is more complicated than originally anticipated, the ARSA provides for the Government of Canada to contribute a higher proportion of those costs than provided for under the Subsidiary Agreement. Going forward, ERDC receives 95% of agreed commercial contractor rates for ongoing development of the closure reclamation plan. Furthermore, with respect to care and maintenance activity during the closure planning phase, the original reducing fee scale was replaced by a fixed fee of $850,000 per year, representing approximately 50% of estimated fully-billable fees.

Social and Environmental Policies

The Corporation maintains a written Code of Business Conduct and Ethics (the “ Code ”), compliance with which is mandatory for all directors, officers and employees, and the full text of which may be viewed at the Corporation’s web site. Included within the Code is a requirement that all directors, officers and employees comply with all laws and governmental regulations applicable to Alexco’s activities, including but not limited to maintaining a safe and healthy work environment, promoting a workplace that is free from discrimination or harassment and conducting all activities in full compliance with all applicable environmental laws. All directors, officers and employees are required to certify in writing their acknowledgement of and compliance with the Code, at the time of hiring and at least annually thereafter. A senior executive of the Corporation is formally appointed the role of Company Ethics Officer, responsible for ensuring adherence to the Code, investigating any reported violations, and ensuring appropriate responses, including corrective action and preventative measures, are taken when required.

Risk Factors

The following are major risk factors management has identified which relate to the Corporation’s business activities. Such risk factors could materially affect the Corporation's future financial results, and could cause events to differ materially from those described in forward-looking statements relating to the Corporation. Though the following are major risk factors identified by management, they do not comprise a definitive list of all risk factors related to the Corporation's business and operations. Other specific risk factors are discussed elsewhere in this AIF, as well as in the Corporation’s consolidated financial statements (under the headings “Description of Business and Nature of Operations”, “Significant Accounting Policies” and “Financial Instruments” and elsewhere within that document) and in management’s discussion and analysis (under the headings “Critical Accounting Estimates” and “Risk Factors” and elsewhere within that document) for its most recently completed financial year, being the year ended December 31, 2017, and its other disclosure documents, all as filed on the SEDAR website at www.sedar.com .

Negative Cash Flow From Operating Activities

The Corporation has not yet consistently achieved positive operating cash flow, and there are no assurances that the Corporation will not experience negative cash flow from operations in the future. The Corporation has incurred net losses in the past and may incur losses in the future and will continue to incur losses until and unless it can derive sufficient revenues from its mineral projects. Such future losses could have an adverse effect on the market price of the Corporation's common shares, which could cause investors to lose part or all of their investment.

Forward-Looking Statements May Prove Inaccurate

Readers are cautioned not to place undue reliance on forward-looking statements. By their nature, forward-looking statements involve numerous assumptions, known and unknown risks and uncertainties, of both a general and specific nature, that could cause actual results to differ materially from those suggested by the forward-looking statements. See "Preliminary Notes – Cautionary Statement Regarding Forward-Looking Statements".

Dilution

The Corporation expects to require additional funds to finance its growth and development strategy. If the Corporation elects to raise additional funds by issuing additional equity securities, such financing may substantially dilute the interests of the Corporation's shareholders. The Corporation may also issue additional securities in the future pursuant to existing and new agreements in respect of its projects or other acquisitions and pursuant to existing securities of the Corporation.

Exploration, Evaluation and Development

Mineral exploration, evaluation and development involves a high degree of risk and few properties which are explored are ultimately developed into producing mines. With respect to the Corporation’s properties, should any ore reserves exist, substantial expenditures will be required to confirm ore reserves which are sufficient to commercially mine, and to obtain the required environmental approvals and permitting required to commence commercial operations. Should any mineral resource be defined on such properties there can be no assurance that the mineral resource on such properties can be commercially mined or that the metallurgical processing will produce economically viable and saleable products. The decision as to whether a property contains a commercial mineral deposit and should be brought into production will depend upon the results of exploration programs and/or technical studies, and the recommendations of duly qualified engineers and/or geologists, all of which involves significant expense. This decision will involve consideration and evaluation of several significant factors including, but not limited to: (1) costs of bringing a property into production, including exploration and development work, preparation of appropriate technical studies and construction of production facilities; (2) availability and costs of financing; (3) ongoing costs of production; (4) market prices for the minerals to be produced; (5) environmental compliance regulations and restraints (including potential environmental liabilities associated with historical exploration activities); and (6) political climate and/or governmental regulation and control.

The ability of the Corporation to sell, and profit from the sale of any eventual production from any of the Corporation’s properties will be subject to the prevailing conditions in the marketplace at the time of sale. Many of these factors are beyond the control of the Corporation and therefore represent a market risk which could impact the long term viability of the Corporation and its operations.

Figures for the Corporation's Resources are Estimates Based on Interpretation and Assumptions and May Yield Less Mineral Production Under Actual Conditions than is Currently Estimated

In making determinations about whether to advance any of its projects to development, the Corporation must rely upon estimated calculations as to the mineral resources and grades of mineralization on its properties. Until ore is actually mined and processed, mineral resources and grades of mineralization must be considered as estimates only. Mineral resource estimates are imprecise and depend upon geological interpretation and statistical inferences drawn from drilling and sampling which may prove to be unreliable. Alexco cannot be certain that:

Any material changes in mineral resource estimates and grades of mineralization will affect the economic viability of placing a property into production and a property’s return on capital. The Corporation's resource estimates have been determined and valued based on assumed future prices, cut-off grades and operating costs that may prove to be inaccurate. Extended declines in market prices for silver, gold, lead, zinc and other commodities may render portions of the Corporation’s mineralization uneconomic and result in reduced reported mineral resources.

Amendments to Share Purchase Agreement with Wheaton

The March 29, 2017 amendments to the SPA with Wheaton, requires that to satisfy the completion test under the Amended SPA, the Corporation will need to recommence operations on the KHSD Property and operate the mine and mill at 400 tonnes per day on or before December 31, 2019. If the completion test is not satisfied by December 31, 2019, the outcome could materially adversely affect the Corporation as it would be required to pay a capacity related refund to Wheaton in the maximum amount of US$8.8 million. The Corporation would need to raise additional capital to finance the capacity related refund and there is no guarantee that the Corporation will be able to raise such additional capital. In the event that the Corporation cannot raise such additional capital, the Corporation will default under the terms of the Amended SPA.

Keno Hill District

While the Corporation has conducted exploration activities in the Keno Hill District, further review of historical records and/or additional exploration and geological testing will be required to determine whether any of the mineral deposits it contains are economically recoverable. There is no assurance that such exploration and testing will result in favourable results. The history of the Keno Hill District has been one of fluctuating fortunes, with new technologies and concepts reviving the District numerous times from probable closure until 1989, when it did ultimately close down for a variety of economic and technical reasons. Many or all of these economic and technical issues will need to be addressed prior to the commencement of any future production on the Keno Hill properties.

Mining Operations

Decisions by the Corporation to proceed with the construction and development of mines, including Bellekeno, are based on development plans which include estimates for metal production and capital and operating costs. Until completely mined and processed, no assurance can be given that such estimates will be achieved. Failure to achieve such production and capital and operating cost estimates or material increases in costs could have an adverse impact on the Corporation’s future cash flows, profitability, results of operations and financial condition. The Corporation’s actual production and capital and operating costs may vary from estimates for a variety of reasons, including: actual resources mined varying from estimates of grade, tonnage, dilution and metallurgical and other characteristics; short-term operating factors, such as the need for sequential development of resource bodies and the processing of new or different resource grades; revisions to mine plans; risks and hazards associated with mining; natural phenomena, such as inclement weather conditions, water availability, floods fire, rock falls and earthquakes, equipment failure and failure of retaining dams around tailings disposal areas which may result in, among other adverse effects, environmental pollution and consequent liability; and unexpected labour shortages or strikes. Costs of production may also be affected by a variety of factors, including changing waste ratios, metallurgical recoveries, labour costs, commodity costs, general inflationary pressures and currency rates. In addition, the risks arising from these factors are further increased while any such mine is progressing through the ramp-up phase of its operations and has not yet established a consistent production track record.

Furthermore, mining operations at the Bellekeno mine project were suspended as of early September 2013 as a result of sharp and significant declines in precious metals prices during the second quarter of 2013. Re-start of mining operations is dependent on a number of factors, including sustained improvements in silver markets and the effectiveness of cost structure reduction measures, and the uncertainties around the achievement of these factors are significant.

Employee Recruitment and Retention

Recruitment and retention of skilled and experienced employees is a challenge facing the mining sector as a whole. During the late 1990s and early 2000s, with unprecedented growth in the technology sector and an extended cyclical downturn in the mining sector, the number of new workers entering the mining sector was depressed and significant number of existing workers departed, leading to a so-called “generational gap” within the industry. Since the mid-2000s, this factor was exacerbated by competitive pressures as the mining sector experienced an extended cyclical upturn. Additional exacerbating factors specific to Alexco include competitive pressures in labour force demand from the oil sands sector in northern Alberta and the mining and oil & gas sectors in British Columbia, and the fact that Alexco’s Keno Hill District is a fly-in/fly-out operation. Alexco has experienced employee recruitment and retention challenges, particularly with respect to mill operators in 2011 and through the first three quarters of 2012. There can be no assurance that such challenges won’t continue or resurface, not only with respect to the mill but in other District operational areas as well including mining and exploration. Furthermore, any re-start of mining operations will necessitate the re-hiring of mine and mill personnel.

Permitting and Environmental Risks and Other Regulatory Requirements

The current or future operations of the Corporation, including development activities, commencement of production on its properties and activities associated with the Corporation's mine reclamation and remediation business, require permits or licenses from various federal, territorial and other governmental authorities, and such operations are and will be governed by laws, regulations and agreements governing prospecting, development, mining, production, taxes, labour standards, occupational health, waste disposal, toxic substances, land use, environmental protection, mine safety and other matters. Companies engaged in the development and operation of mines and related facilities and in mine reclamation and remediation activities generally experience increased costs and delays as a result of the need to comply with the applicable laws, regulations and permits. There can be no assurance that all permits and permit modifications which the Corporation may require for the conduct of its operations will be obtainable on reasonable terms or that such laws and regulations would not have an adverse effect on any project which the Corporation might undertake.

Any failure by the Corporation to comply with applicable laws, regulations and permitting requirements may result in enforcement actions including orders issued by regulatory or judicial authorities causing operations to cease or be curtailed, and may include corrective measures requiring capital expenditures, installation of additional equipment or remedial actions against the Corporation. The Corporation may be required to compensate those suffering loss or damage by reason of the Corporation’s mining operations or mine reclamation and remediation activities and may have civil or criminal fines or penalties imposed upon it for violation of applicable laws or regulations.

Amendments to current laws, regulations and permits governing operations and activities of mining companies and mine reclamation and remediation activities could have a material adverse impact on the Corporation. As well, policy changes and political pressures within and on federal, territorial and First Nation governments having jurisdiction over or dealings with the Corporation could change the implementation and interpretation of such laws, regulations and permits, also having a material adverse impact on the Corporation. Such impacts could result in one or more of increases in capital expenditures or production costs, reductions in levels of production at producing properties or abandonment or delays in the development of new mining properties.

Environmental Services

A material decline in the level of activity or reduction in industry willingness to spend capital on mine reclamation, remediation or environmental services could adversely affect demand for AEG's environmental services. Likewise, a material change in mining product commodity prices, the ability of mining companies to raise capital or changes in domestic or international political, regulatory and economic conditions could adversely affect demand for AEG's services.

One of AEG’s customers accounted for 32% of environmental services revenues in the 2017 fiscal year. The loss of, or a significant reduction in the volume of business conducted with this customer could have a significant detrimental effect on AEG’s environmental services business and the Corporation.

The patents which the Corporation owns or has access to or other proprietary technology may not prevent AEG's competitors from developing substantially similar technology, which may reduce AEG's competitive advantage. Similarly, the loss of access to any of such patents or other proprietary technology or claims from third parties that such patents or other proprietary technology infringe upon proprietary rights which they may claim or hold would be detrimental to AEG's reclamation and remediation business and a material adverse impact on the Corporation.

AEG may not be able to keep pace with continual and rapid technological developments that characterize the market for AEG's environmental services, and AEG’s failure to do so may result in a loss of its market share. Similarly, changes in existing regulations relating to mine reclamation and remediation activities could require AEG to change the way it conducts its business.

AEG is dependent on the professional skill sets of its employees, some of whom would be difficult to replace. The loss of any such employees could significantly affect AEG’s ability to service existing clients, its profitability and its ability to grow its business.

Potential Profitability of Mineral Properties Depends Upon Factors Beyond the Control of the Corporation

The potential profitability of mineral properties is dependent upon many factors beyond the Corporation’s control. For instance, world prices of and markets for gold, silver, lead and zinc are unpredictable, highly volatile, potentially subject to governmental fixing, pegging and/or controls and respond to changes in domestic, international, political, social and economic environments. Another factor is that rates of recovery may vary from the rate experienced in tests and a reduction in the recovery rate will adversely affect profitability and, possibly, the economic viability of a property. Profitability also depends on the costs of operations, including costs of labour, materials, equipment, electricity, environmental compliance or other production inputs. Such costs will fluctuate in ways the Corporation cannot predict and are beyond the Corporation’s control, and such fluctuations will impact on profitability and may eliminate profitability altogether. Additionally, due to worldwide economic uncertainty, the availability and cost of funds for development and other costs have become increasingly difficult, if not impossible, to project. These changes and events may materially affect the financial performance of the Corporation.

First Nation Rights and Title

The nature and extent of First Nation rights and title remains the subject of active debate, claims and litigation in Canada, including in the Yukon and including with respect to intergovernmental relations between First Nation authorities and federal, provincial and territorial authorities. There can be no guarantee that such claims will not cause permitting delays, unexpected interruptions or additional costs for the Corporation’s projects. These risks may have increased after the Supreme Court of Canada decision of June 26, 2014 in Tsilhqot'in Nation v. British Columbia .

Title to Mineral Properties

The acquisition of title to mineral properties is a complicated and uncertain process. The properties may be subject to prior unregistered agreements of transfer or land claims, and title may be affected by undetected defects. Although the Corporation has made efforts to ensure that legal title to its properties is properly recorded in the name of the Corporation, there can be no assurance that such title will ultimately be secured. As a result, the Corporation be constrained in its ability to operate its mineral properties or unable to enforce its rights with respect to its mineral properties. An impairment to or defect in the Corporation’s title to its mineral properties would adversely affect the Corporation’ business and financial condition.

Capitalization and Commercial Viability

The Corporation will require additional funds to further explore, develop and mine its properties. The Corporation has limited financial resources, and there is no assurance that additional funding will be available to the Corporation to carry out the completion of all proposed activities, for additional exploration or for the substantial capital that is typically required in order to place a property into commercial production. Although the Corporation has been successful in the past in obtaining financing through the sale of equity securities, there can be no assurance that the Corporation will be able to obtain adequate financing in the future or that the terms of such financing will be favourable. Failure to obtain such additional financing could result in the delay or indefinite postponement of further exploration and development of its properties.

General Economic Conditions May Adversely Affect the Corporation’s Growth and Profitability

The unprecedented events in global financial markets since 2008 have had a profound impact on the global economy and led to increased levels of volatility. Many industries, including the mining industry, are impacted by these market conditions. Some of the impacts of the current financial market turmoil include contraction in credit markets resulting in a widening of credit risk, devaluations and high volatility in global equity, commodity, foreign currency exchange and precious metal markets, and a lack of market liquidity. If the current turmoil and volatility levels continue they may adversely affect the Corporation's growth and profitability. Specifically:

These factors could have a material adverse effect on Alexco’s financial condition and results of operations.

Operating Hazards and Risks

In the course of exploration, development and production of mineral properties, certain risks, particularly including but not limited to unexpected or unusual geological operating conditions including rock bursts, cave-ins, fires, flooding and earthquakes, may occur. It is not always possible to fully insure against such risks and the Corporation may decide not to insure against such risks as a result of high premiums or other reasons. Should such liabilities arise, they could reduce or eliminate any future profitability and result in increasing costs and a decline in the value of the securities of the Corporation.

Adverse weather conditions could also disrupt the Corporation’s environmental services business and/or reduce demand for the Corporation’s services.

Competition

Significant and increasing competition exists for mining opportunities internationally. There are a number of large established mining companies with substantial capabilities and far greater financial and technical resources than the Corporation. The Corporation may be unable to acquire additional attractive mining properties on terms it considers acceptable and there can be no assurance that the Corporation’s exploration and acquisition programs will yield any reserves or result in any commercial mining operation.

Certain of the Corporation’s Directors and Officers are Involved with Other Natural Resource Companies, Which May Create Conflicts of Interest from Time to Time

Some of the Corporation’s directors and officers are directors or officers of other natural resource or mining-related companies. These associations may give rise to conflicts of interest from time to time. As a result of these conflicts of interest, the Corporation may miss the opportunity to participate in certain transactions.

The Corporation May Fail to Maintain Adequate Internal Control Over Financial Reporting Pursuant to the Requirements of the Sarbanes-Oxley Act

Section 404 of the Sarbanes-Oxley Act (“ SOX ”) requires an annual assessment by management of the effectiveness of the Corporation’s internal control over financial reporting. The Corporation may fail to maintain the adequacy of its internal control over financial reporting as such standards are modified, supplemented or amended from time to time, and the Corporation may not be able to ensure that it can conclude, on an ongoing basis, that it has effective internal control over financial reporting in accordance with Section 404 of SOX. The Corporation’s failure to satisfy the requirements of Section 404 of SOX on an ongoing, timely basis could result in the loss of investor confidence in the reliability of its financial statements, which in turn could harm the Corporation’s business and negatively impact the trading price or the market value of its securities. In addition, any failure to implement required new or improved controls, or difficulties encountered in their implementation, could harm the Corporation’s operating results or cause it to fail to meet its reporting obligations. Future acquisitions of companies, if any, may provide the Corporation with challenges in implementing the required processes, procedures and controls in its acquired operations. No evaluation can provide complete assurance that the Corporation’s internal control over financial reporting will detect or uncover all failures of persons within the Corporation to disclose material information otherwise required to be reported. The effectiveness of the Corporation’s processes, procedures and controls could also be limited by simple errors or faulty judgments. Although the Corporation intends to expend substantial time and incur substantial costs, as necessary, to ensure ongoing compliance, there is no certainty that it will be successful in complying with Section 404 of SOX.

As a “foreign private issuer”, the Corporation is exempt from Section 14 proxy rules and Section 16 of the Securities Exchange Act of 1934

The Corporation is a “foreign private issuer” as defined in Rule 3b-4 under the United States Securities Exchange Act of 1934, as amended (the “U.S. Exchange Act”). Equity securities of the Corporation are accordingly exempt from Sections 14(a), 14(b), 14(c), 14(f) and 16 of the U.S. Exchange Act pursuant to Rule 3a12-3 of the U.S. Exchange Act. Therefore, the Corporation is not required to file a Schedule 14A proxy statement in relation to the annual meeting of shareholders. The submission of proxy and annual meeting of shareholder information on Form 6-K may result in shareholders having less complete and timely information in connection with shareholder actions. The exemption from Section 16 rules regarding reports of beneficial ownership and purchases and sales of common shares by insiders and restrictions on insider trading in our securities may result in shareholders having less data and there being fewer restrictions on insiders’ activities in our securities.

It may be difficult to enforce judgments or bring actions outside the United States against the Corporation and certain of our directors

The Corporation is a Canadian corporation and certain of its directors, officers and experts are neither citizens nor residents of the United States. A substantial part of the assets of the Corporation and of certain of these persons are located outside the United States. As a result, it may be difficult or impossible for an investor:

DIVIDENDS

The Corporation has not paid any dividends on its common shares since its incorporation. Any decision to pay dividends on common shares in the future will be made by the board of directors on the basis of the earnings, financial requirements and other conditions existing at such time.

DESCRIPTION OF CAPITAL STRUCTURE

The authorized capital of the Corporation consists of an unlimited number of common shares, without par value. As at the close of business on March 14, 2018, 101,642,752 common shares of the Corporation were issued and outstanding.

The holders of the common shares are entitled to vote at all meetings of holders of common shares, to receive dividends if, as and when declared by the directors and to participate rateably in any distribution of property or assets upon the liquidation, winding-up or other dissolution of the Corporation. The common shares carry no pre-emptive rights, conversion or exchange rights, or redemption, retraction, repurchase, sinking fund or purchase fund provisions. There are no provisions requiring a holder of common shares to contribute additional capital and no restrictions on the issuance of additional securities by the Corporation. There are no restrictions on the repurchase or redemption of common shares by the Corporation except to the extent that any such repurchase or redemption would render the Corporation insolvent.

MARKET FOR SECURITIES

Trading Price and Volume

The common shares of the Corporation are listed and posted for trading on the Toronto Stock Exchange (the “ TSX ”) under the symbol “AXR”, and on the NYSE American Equities Exchange (the “ NYSE American ”) under the symbol “AXU”. The following tables set forth the market price range and trading volumes of the Corporation’s common shares on each of the TSX and NYSE American for the periods indicated.

Securities Not Listed or Quoted

The only classes of securities of the Corporation that are not listed or quoted on a marketplace are stock options, restricted shares units (“RSU”) and warrants. During the year ended December 31, 2017, 1,645,500 stock options, 235,000 RSUs and 126,174 warrants were issued.

During the year ended December 31, 2017, the Corporation issued the following warrants and granted the following stock options and RSUs to purchase common shares:

DIRECTORS AND OFFICERS

Name, Occupation and Security Holding

The name, province or state, country of residence, position or office held with the Corporation and principal occupation during the past five years of each director and executive officer of the Corporation as at December 31, 2017 and as at the date hereof are described as follows:

Each of the Corporation’s directors is elected by the Corporation’s shareholders at an annual meeting to serve until the next annual meeting of shareholders or until a successor is elected or appointed. The board of directors appoints the Corporation’s executive officers annually after each annual meeting, to serve at the discretion of the board of directors.

Based on information provided by such persons, as at the date hereof the directors and executive officers of the Corporation as a group beneficially owned, directly or indirectly, or exercised control or direction over, an aggregate of 5,293,508 common shares of the Corporation (including 1,940,299 shares owned by ALM Investments ULC (formerly Asset Liability Management Group ULC), a company controlled by Mr. Nauman), representing 5.2% of the issued and outstanding common shares of the Corporation. The directors and executive officers of the Corporation as a group held warrants for the purchase of an aggregate of 25,000 common shares in the capital of the Corporation, representing 0.41% of all outstanding warrants of the Corporation. In addition, the directors and executive officers of the Corporation as a group also hold stock options for the purchase of an aggregate of 5,872,666 common shares in the capital of the Corporation, representing 72% of all outstanding options of the Corporation. Lastly, the directors and executive officers of the Corporation as a group held RSUs that can be settled by way of shares issued from treasury for a further 263,323 common shares.

Cease Trade Orders, Bankruptcies, Penalties or Sanctions

To the knowledge of the Corporation, none of the Corporation's directors or executive officers is, as at the date of this AIF, or has been, within ten years before the date of this AIF, a director, chief executive officer or chief financial officer of any Corporation (including the Corporation) that:

“ Order ” means a cease trade order, an order similar to a cease trade order, or an order that denied the relevant Corporation access to any exemption under securities legislation and, in each case, that was in effect for a period of more than 30 consecutive days.

None of the Corporation's directors or executive officers or, to the Corporation's knowledge, any shareholder holding a sufficient number of securities of the Corporation to affect materially the control of the Corporation:

Conflicts of Interest

The directors of the Corporation are required by law to act honestly and in good faith with a view to the best interest of the Corporation and to disclose any interests which they may have in any project or opportunity of the Corporation. If a conflict of interest arises at a meeting of the board of directors, any director in a conflict will disclose his interest and abstain from voting on such matter. In determining whether or not the Corporation will participate in any project or opportunity, that director will primarily consider the degree of risk to which the Corporation may be exposed and its financial position at that time.

To the best of the Corporation's knowledge, other than disclosed below, there are no known existing or potential conflicts of interest among the Corporation, its promoters, directors, officers or other members of management of the Corporation as a result of their outside business interests except that certain of the directors, officers, promoters and other members of management serve as directors, officers, promoters and members of management of other public companies, and therefore it is possible that a conflict may arise between their duties as a director, officer, promoter or member of management of such other companies.

James Harrington, MSc., the Senior Vice President and Chief Technical Officer of AEG Canada (a subsidiary of the Corporation), owns a holding company (“ Arete ”) which holds all of the shares of Alexco Environmental Group (US) Inc., a former subsidiary of the Corporation (“ AEG US ”). The sale of AEG US to Mr. Harrington’s holding company is not considered a material transaction and was reviewed and approved by a special committee of independent directors, as well as the board of directors, of the Corporation prior to completion of the transaction. The purpose of the transaction was to enable Arete to complete the purchase of a redevelopment project which involves significant environmental work, which could, if purchased, provide an opportunity for the Corporation’s environmental group with respect to the environmental work without exposing the Corporation to environmental risk from ownership of such project.

The directors and officers of the Corporation are aware of the existence of laws governing accountability of directors and officers for corporate opportunity and requiring disclosures by directors of conflicts of interest and the Corporation relies upon such laws in respect of any directors’ and officers’ conflicts of interest or in respect of any breaches of duty by any of its directors or officers. Such directors or officers in accordance with the Business Corporations Act (British Columbia) are required to disclose all such conflicts and to govern themselves in respect thereof to the best of their ability in accordance with the obligations imposed upon them by law.

AUDIT COMMITTEE INFORMATION

Audit Committee Charter

The following is the text of the Audit Committee’s Charter:

" GENERAL

The primary function of the Audit Committee, under the supervision of the Board, is to assist the Board in fulfilling its oversight responsibilities regarding the integrity of the Company's accounting and financial reporting processes and provision of financial information to the shareholders and others, the systems of internal controls and disclosure controls, the Company's internal and external audit process, the Company's policies with regard to ethics and business practices, and monitoring compliance with the Company's legal and regulatory requirements with respect to its financial statements.

The Audit Committee is accountable to the Board. In the course of fulfilling its specific responsibilities hereunder, the Audit Committee is expected to maintain open communications between the Company's external auditor, senior management and the Board.

The Audit Committee does not plan or perform audits or warrant or attest to the accuracy or completeness of the Company's financial statements or financial disclosure or compliance with generally accepted accounting procedures as these are the responsibilities of management and the external auditor.

COMPOSITION

The Audit Committee shall be comprised of at least three directors, who generally shall be appointed or confirmed by the Board annually. The Chair of the Audit Committee shall be appointed by the Board, failing which the members of the Audit Committee may designate a Chair by a majority vote of the full Audit Committee membership. All members of the Audit Committee shall be directors and shall meet the independence, financial literacy and experience requirements under applicable laws, rules and regulations binding on the Company from time to time, including without limitation the applicable rules of any stock exchanges upon which the Company's shares are listed and the requirements for independence and financial literacy under National Instrument 52-110 Audit Committees (“ NI 52-110 ”) in Canada, Section 803A of the NYSE Company Guide and Rule 10A-3 of the United States Securities Exchange Act of 1934, as amended (the “ Exchange Act ”). Furthermore, at least one member of the Audit Committee shall qualify as a “financial expert” as such term is defined in Item 407 of Regulation S-K under the Exchange Act.

PROCEDURAL MATTERS

The Audit Committee:

RESPONSIBILITIES

Subject to the powers and duties of the Board, the Board hereby delegates to the Audit Committee the following powers and duties to be performed by the Audit Committee on behalf of and for the Board.

Financial Reporting, Accounting and Financial Management

The Audit Committee has primary responsibility for overseeing the actions of management in all aspects of financial management and reporting. The Audit Committee shall:

External Auditor

The Audit Committee has primary responsibility for the selection, appointment, dismissal, compensation and oversight of the external auditor, subject to the overall approval of the Board. For this purpose, the Audit Committee may consult with management, but the external auditor shall report directly to the Audit Committee. The specific responsibilities of the Audit Committee with regard to the external auditor are to:

Audit and Financial Reporting Process

The Audit Committee has a duty to receive, review and make any inquiry regarding the completeness, accuracy and presentation of the Company's financial statements to ensure that the financial statements fairly present the financial position and risks of the organization and are prepared in accordance with the applicable generally accepted accounting principles. To accomplish this, the Audit Committee shall:

Interim Financial Statements

Pursuant to its mandate, the Board shall generally approve the Company's annual and interim financial statements. Notwithstanding the foregoing, on an exceptions basis the Board may from time to time delegate to the Audit Committee the power to approve the Company's interim financial statements.

The Audit Committee shall:

Code of Ethics

The Audit Committee has primary responsibility for overseeing the application of, and compliance with, the Company's Code of Business Conduct and Ethics (the “ Code ”). The Audit Committee shall review at least annually:

COMPLAINTS UNDER WHISTLEBLOWER POLICY

To ensure that the Company has adequate procedures in place for the confidential and anonymous (where permitted by law) receipt, retention, and treatment of complaints received by the Company regarding (a) accounting, internal accounting controls, or auditing matters, and (b) compliance with the Code and all applicable government laws, rules and regulations, the Committee has recommended and the Board has adopted a Company Whistleblower Policy. All such complaints shall be dealt with under the terms of that Policy."

Composition of the Audit Committee

As at December 31, 2017 and the date of this AIF, the members of the Audit Committee are Terry Krepiakevich, Elaine Sanders and Richard Zimmer, with Mr. Krepiakevich serving as the Chair of the Audit Committee. All of these members are financially literate and independent for the purposes of National Instrument 52-110 (“ NI 52-110 ”). During the fiscal year covered by this report, Michael Winn served on the Audit Committee from January 1, 2017 through April 17, 2017 when Richard Zimmer replaced Mr. Winn on the Committee. The Board has determined that Mr. Winn was independent (for the purposes of NI 52-110) during the time he served on the Audit Committee.

Mr. Krepiakevich qualifies as a financial expert and is financially sophisticated, in that he has an understanding of generally accepted accounting principles and financial statements; is able to assess the general application of accounting principles in connection with the accounting for estimates, accruals and reserves; has experience analyzing or evaluating financial statements that entail accounting issues of equal complexity to the Corporation's financial statements (or actively supervising another person who did so); and has a general understanding of internal controls and procedures for financial reporting and an understanding of audit committee functions.

Mr. Krepiakevich is a member of the board of directors of several publicly-listed and private companies since July 2011. From June 2006 to July 2011, Mr. Krepiakevich was the Chief Financial Officer of SouthGobi Resources Ltd., a publicly-listed mining company focused on exploring and developing coal deposits in Mongolia’s South Gobi Region. Previously, Mr. Krepiakevich was Chief Financial Officer for Extreme CCTV Inc., a publicly traded company on the TSX involved in manufacturing high tech surveillance equipment, and Vice-President Finance and Chief Financial Officer of Maynards Industries Ltd., a private firm specializing in retailing, auctioneering, liquidating, and mergers and acquisition services. Prior to his position with Maynards, Mr. Krepiakevich was a senior officer in a number of private and public issuers. He is a Canadian qualified Chartered Professional Accountant and was employed with the international accounting firm Peat Marwick Thorne (KPMG), where he worked with a number of companies in mining and related industries.

Ms. Sanders is the Vice President, Chief Financial Officer and Corporate Secretary for Trilogy Metals Inc. (formerly NovaCopper Inc.). Prior to Trilogy Metals Inc. Ms. Sanders served as Vice President, Chief Financial Officer and Corporate Secretary for NovaGold Resources Inc. Ms. Sanders has over 20 years of experience in audit, finance, and accounting with public and private companies and Bachelor of Commerce degree from the University of Alberta, is a Canadian qualified Chartered Professional Accountant and a Certified Public Accountant in the United States.

Mr. Zimmer is a corporate director and is the former President and Chief Executive Officer of Far West Mining Ltd., which was acquired by Capstone Mining Corp. in 2011. Prior to Far West, Mr. Zimmer worked for Teck Corporation, Teck-Cominco and Teck-Pogo Inc. From 1992 to 2007 he served in various engineering and operating roles and from 1998 to 2007, as Vice President and Project Manager for Teck-Pogo Inc. on the design and construction of the Pogo Mine near Fairbanks, Alaska. Before joining Teck, Mr. Zimmer was employed with Bow Valley Industries as Senior Staff Engineer responsible for evaluation of new mining ventures. Mr. Zimmer has over 40 years of experience in the mining industry and has a B.Sc. degree, B. Eng., MBA and is a P.Eng in the Province of British Columbia.

Reliance on Certain Exemptions

At no time since the commencement of the Corporation's most recently completed financial year has the Corporation relied on the exemption in Section 2.4 of NI 52-110 (De Minimis Non-audit Services), Section 3.2 of NI 52-110 (Initial Public Offerings), Section 3.3(2) of NI 52-110 (Controlled Companies), Section 3.4 of NI 52-110 (Events Outside Control of Member), Section 3.5 of NI 52-110 (Death, Disability or Resignation of Audit Committee Member), Section 3.6 of NI 52-110 (Temporary Exemption for Limited and Exceptional Circumstances) or Section 3.8 of NI 52-110 (Acquisition of Financial Literacy), or an exemption from NI 52-110, in whole or in part, granted under Part 8 of NI 52-110 (Exemptions).

Audit Committee Oversight

At no time since the commencement of the Corporation's most recently completed financial year was a recommendation of the Committee to nominate or compensate an external auditor not adopted by the board of directors.

Pre-Approval Policies and Procedures

The Audit Committee nominates and engages the independent auditors to audit the financial statements, and approves all audit, audit-related services, tax services and other services provided by the Corporation’s independent registered public accounting firm, PricewaterhouseCoopers LLP, Chartered Professional Accountants (“PwC”). Any services provided by PwC that are not specifically included within the scope of the audit must be pre-approved by the audit committee prior to any engagement. The audit committee is permitted to approve certain fees for audit-related services, tax services and other services pursuant to a de minimus exception before the completion of the engagement. No fees paid to PwC in either of the fiscal years ended December 31, 2017 or 2016 were approved pursuant to the de minimus exception.

External Auditor Service Fees (By Category)

PwC, is the independent registered public accounting firm for the Corporation and have acted as the Corporation's independent auditor for the years ended December 31, 2017 and 2016. The chart below sets forth the total amount billed the Corporation by PwC for services performed in these periods and breaks down these amounts by category of service (for audit fees, audit-related fees, tax fees and all other fees):

“Audit Fees” are the aggregate fees billed by PwC for the audits of the Corporation’s consolidated annual financial statements and internal control over financial reporting that are provided in connection with statutory and regulatory filings or engagements.

“Audit-Related Fees” are fees charged by PwC for assurance and related services that are reasonably related to the performance of the audit or review of the Corporation’s financial statements and are not reported under “Audit Fees”. This category includes but is not limited to fees billed for independent accountant review of the interim financial statements, advisory services associated with the Corporation’s financial reporting and fees charged for services rendered in connection with registration statements and other securities offering documents.

“Tax Fees” are fees for professional services rendered by PwC for tax compliance, tax advice on actual or contemplated transactions.

“All Other Fees” include all fees charged by PwC for products or services other than those charged for “Audit Fees”, “Audit-Related Fees” and “Tax Fees”.

LEGAL PROCEEDINGS AND REGULATORY ACTIONS

The Corporation is not a party to any legal proceedings involving a claim for damages in excess of ten percent of the Corporation’s current assets, nor is a party to any regulatory actions, and is not aware of any such proceedings or actions known to be contemplated.

INTEREST OF MANAGEMENT AND OTHERS IN MATERIAL TRANSACTIONS

The directors, executive officers and principal shareholders of the Corporation or any associate or affiliate of the foregoing have had no material interest, direct or indirect, in any transactions in which the Corporation has participated within the three most recently completed financial periods prior to the date of this AIF or in the current financial year, and do not have any material interest in any proposed transaction, which has materially affected or is reasonably expected to materially affect the Corporation, except as set out elsewhere in this AIF or as follows:

Certain directors and/or officers of the Corporation have subscribed for common shares of the Corporation pursuant to the public and private placement financings of the Corporation.

TRANSFER AGENTS AND REGISTRARS

The registrar and transfer agent for the common shares of the Corporation in British Columbia and Ontario is Computershare Investor Services Inc., Vancouver, British Columbia.

MATERIAL CONTRACTS

The Wheaton SPA, as amended (as described under the heading “General Development of the Business – Three Year History and Significant Acquisitions”), is the only material contracts entered into by the Corporation within the year ended December 31, 2017 or before such time that are still in effect, other than in the ordinary course of business. The SPA and subsequent amendments are available on the SEDAR website at www.sedar.com under the Corporation’s profile.

INTERESTS OF EXPERTS

Names of Experts

The following sets forth each person named as having prepared or certified a report, valuation, statement or opinion described or included in a filing (including this AIF), or referred to in a filing, made under National Instrument 51-102 by the Corporation during, or relating to, its most recently completed financial year and whose profession or business gives authority to the report, valuation, statement or opinion made by the person or company:

Interests of Experts

Based on information provided by the experts named above, other than with respect to Alan McOnie, Neil Chambers and PwC as described below, none of the experts named under “Names of Experts”, when or after they prepared the statement, report or valuation, has received any registered or beneficial interests, direct or indirect, in any securities or other property of the Corporation or of one of the Corporation's associates or affiliates (based on information provided to the Corporation by the experts) or is or is expected to be elected, appointed or employed as a director, officer or employee of the Corporation or of any associate or affiliate of the Corporation.

Alan McOnie is currently an executive officer and Neil Chambers is currently an employee of the Corporation, as described above. Both Alan McOnie and Neil Chambers have been granted stock options of the Corporation through the course of their respective employments; however, the individual interests held by each of them throughout their respective employment terms at all times represented less than one percent of the issued and outstanding common shares of the Corporation.

PwC is the Corporation’s independent registered public accounting firm. PwC have advised the Corporation that they are independent with respect to the Corporation within the meaning of the Chartered Professional Accountants of British Columbia Code of Professional Conduct and the rules and standards of the Public Company Accounting Oversight Board and the securities laws and regulations administered by the SEC.

ADDITIONAL INFORMATION

Additional information relating to the Corporation may be found on SEDAR at www.sedar.com , as well as at the Corporation’s web site at www.alexcoresource.com .

Additional information, including directors' and officers' remuneration and indebtedness, principal holders of the Corporation's securities, and securities authorized for issuance under equity compensation plans, where applicable, is contained in the Corporation's information circular for its most recent annual general meeting of securityholders that involved the election of directors.

Additional financial information is provided in the Corporation's consolidated financial statements and management's discussion and analysis for its most recently completed financial period, being the year ended December 31, 2017.

SCHEDULE "A"

Summary from PEA

" 1 Summary

Executive Summary

Roscoe Postle Associates Inc. (RPA) was retained by Alexco Resource Corp. (Alexco) to prepare a Preliminary Economic Assessment (PEA or the Study) on the Keno Hill Silver District Project (the Project), located in the Yukon Territory, Canada. The purpose of this report is to disclose the results of the PEA. This Technical Report conforms to National Instrument 43-101 Standards of Disclosure for Mineral Projects (NI 43-101). RPA carried out a site visit from September 12 to 14, 2016.

Alexco is a public company with its headquarters in Vancouver, B.C. Alexco, through wholly owned subsidiaries, owns the mineral rights for the Keno Hill Silver District (KHSD) following its successful bid for the assets of the bankrupt United Keno Hill Mines Ltd in 2006. Alexco obtained the properties with all pre-existing liabilities subject to indemnification. Alexco also owns an environmental consulting company, Alexco Environmental Group (AEG), which provides environmental services to Alexco and the mining and mineral exploration industry.

The Project comprises:

In 2008, Alexco entered into a Silver Purchase Agreement (SPA) with Silver Wheaton Corp. (Silver Wheaton) whereby 25% of all future silver production from the KHSD properties owned or controlled by Alexco at the time of the consummation of the SPA will be delivered to Silver Wheaton in exchange for a payment of US$3.90 per ounce as well as a payment by Silver Wheaton of US$50 million. The SPA has been renegotiated on several occasions and effective March 29, 2017, the Company entered into an agreement with Silver Wheaton to amend the SPA whereby Silver Wheaton will continue to receive 25% of the LOM payable silver from the KHSD with the production payment (originally US$3.90 per ounce) to be based on monthly silver head grade and monthly silver price. The actual monthly production payment will fall within a defined grade and pricing range governed by upper and lower numeric criteria (ceiling grade/price and floor grade/price) pursuant to the following formula:

Mining at Bellekeno was suspended in September 2013, before all of the conditions of the SPA were met by Alexco.

Alexco used the funds from the SPA for development on the property, the 2010 construction of a 408 tonne per day (tpd) capacity flotation processing plant and the commencement of mining at the Bellekeno deposit. In 2014, a PEA was published for the Bellekeno, Flame & Moth, and Lucky Queen deposits. Since 2013, Alexco has maintained the Project on a care and maintenance status and focussed on additional exploration leading to increases in the Mineral Resources for the Bermingham and Flame & Moth deposits. The revised Bermingham Mineral Resource has been included in this PEA study for a 400 tpd operation including the Flame & Moth, Bellekeno, Bermingham, and Lucky Queen deposits.

In addition to the development of the PEA, the Mineral Resource estimates for the Onek, Lucky Queen, Flame & Moth, and Bermingham deposits have been updated to a single reference date and with the same metal price and foreign exchange rates.

This report is considered by RPA to meet the requirements of a Preliminary Economic Assessment as defined in Canadian NI 43-101 regulations. The economic analysis contained in this report is based, in part, on Inferred Mineral Resources, and is preliminary in nature. Inferred Mineral Resources are considered to be too geologically speculative to have mining and economic considerations applied to them and to be categorized as Mineral Reserves. There is no certainty that economic forecasts on which this PEA is based will be realized.

A summary of the Mineral Resource at the KHSD is shown in Table 1-1.

Notes:

Conclusions

RPA offers the following conclusions:

Recommendations

RPA provides the following recommendations:

Economic Analysis

The economic analysis contained in this report is based, in part, on Inferred Resources, and is preliminary in nature. Inferred Resources are considered too geologically speculative to have mining and economic considerations applied to them and to be categorized as Mineral Reserves. There is no certainty that economic forecasts on which this PEA is based will be realized. Inferred Mineral Resources form the basis of 2% of the Indicated and Inferred Mineral Resources included in the conceptual plant feed schedule of this PEA.

A pre-tax Cash Flow Projection (base case) has been generated from the LOM production schedule and capital and operating cost estimates, and is summarized in Table 1-2. A summary of the key criteria is provided below.

Economic Criteria

Revenue

Costs

RPA has relied upon Alexco and its tax advisors for the calculation of the taxes in the economic model.