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Alexco Provides Keno Hill Operations Update

Press Release

June 22, 2022 ‑ Alexco Resource Corp. (NYSE American/TSX: AXU) (“Alexco” or the “Company”) today provides the following update on operations and exploration at the Company’s wholly owned Keno Hill Silver District (“Keno Hill”) in Yukon Territory, Canada.

Ramp-up of mining activity at Keno Hill continued to progress in May with sustained underground development performance aided by improved equipment availability at both the Flame & Moth and Bermingham mines. Similarly, the district mill saw improved throughput and metallurgical performance in the same period. Underground advance at Bermingham reached the 1120 level, where the upper portion of the high-grade Bear Zone has been cross-cut with two ore faces and predictive block model grades of 1,900 – 2,000 grams per tonne (“g/t”) silver (“Ag”) appearing to be well supported or exceeded in mine based rib and face assays. Additionally, in May, the Company milled approximately 5,750 tonnes of ore, representing an approximate 19% increase over April. The mill operated for 16 days in May, nine of those days operating at throughput above the nameplate capacity of 400 tonnes per day (“tpd”). The metallurgical performance continued to be robust, with over 93% total silver recoveries to concentrate and in excess of 16,300 g/t Ag in the lead concentrate.

While the underground performance improvements are notable, and the demonstrated supply of 150-250 tpd of ore to the mill has been important, it is also apparent from results to date that the rate of improvement in the advance of underground development remains insufficient to achieve the necessary number of production headings to sustain 400 tpd feed to the mill before the end of 2022. To rectify this imbalance, the Company has elected to temporarily suspend milling operations for five to six months and to focus all efforts on advancing underground development. After this development period is complete, the Company anticipates accessing, cross-cutting, and having available a total of approximately 120,000 tonnes of ore inventory grading 1,050 g/t Ag at the Bermingham and Flame & Moth mines by year end 2022. Ore extraction and milling operations will be restarted in January 2023, and with our anticipated production, cash self-sufficiency should be achieved within the first quarter of 2023. The Company estimates that more than four million ounces of silver will be delivered as ore feed to the district mill in 2023.

“As previously indicated in May, our operations ramp-up plan is running well behind schedule,” said Clynton Nauman Chairman and CEO of Alexco, “and at this juncture we have enough information to determine that the rate of improvement in underground performance is not sufficient to reach a sustainable 400 tpd and cash self sufficiency in 2022. We need to get further ahead with underground development, and that requires five to six months of focused underground advance to ensure we have available, and can maintain, two to three levels of development ahead of primary production levels in each mine. This refocussing of operations is the right decision and it is unquestionably in the best interest of the mine and the Company as a whole. The alternative of continuing to operate under the status quo with slowly improving ore deliveries to the mill for the balance of 2022, only serves to diminish the benefit of extremely high-grade ore, instead of using that benefit to generate free cash flow and hence returns for our shareholders early in 2023.”

With transition of operations activities to an interim development focused plan, additional financing will be required. As of the date of this press release, the cash position of Alexco is approximately $14 million with negative working capital of approximately $4.5 million. The final scope, cost, and timing of the interim development-only plan and the subsequent transition back to full mill operations with concentrate shipments in January 2023 remains under review and will be communicated once completed. Additionally, the Company will continue to evaluate all financing and strategic options available to enhance the value of Keno Hill.

In other activities at Keno Hill, surface exploration began with two drills in May with focus in the vicinity of the historic Silver King mineand the Coral Wigwam area, approximately 800 meters along structural trend from the Bermingham Mine. Early indications from shallow geology-defining drill holes in the Coral Wigwam area have identified a structural geology framework potentially similar to that which hosts the Bermingham deposit. The next phase of this work will focus on deeper drilling of the targeted structure(s) within permissive stratigraphy, areas which proved highly productive in the adjacent Bermingham deposit.

Qualified Person

The disclosure of all other scientific and technical information in this news release regarding mine development and operations has been reviewed and approved by Sebastien D. Tolgyesi, P.Eng., P.Geo. (Keno Hill Operations Manager, Alexco), who is are Qualified Persons as defined by National Instrument 43-101 – Standards of Disclosure for Mineral Projects.

About Alexco

Alexco is a Canadian primary silver company that owns and operates the majority of the historic Keno Hill Silver District, in Canada’s Yukon Territory, one of the highest-grade silver mines in the world. Alexco started concentrate production and shipments in 2021 and is currently advancing Keno Hill toward steady state production. Upon reaching commercial production, Keno Hill is expected to produce an average of approximately 4.4 million ounces of silver per year contained in high quality lead/silver and zinc concentrates. Keno Hill retains significant potential to grow and Alexco has a long history of expanding the operation’s mineral resources through successful exploration.

Contact

Clynton R. Nauman, Chairman and Chief Executive Officer
Rajni Bala, Investor Relations and Communications Lead
Phone: (778) 945-6577
Email: [email protected]

Website: www.alexcoresource.com

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