Artemis Gold Announces Expanded Phase 2 Development at Blackwater Mine

Press Release

December 15, 2025

• Capital-efficient, $1.44 billion expanded Phase 2 (“EP2”) development of processing capacity to 21 Mtpa expected to be funded from operating cash flow

• Over 500,000 ounces of annual gold production expected for first 10 full years, transforming Blackwater into one of the three largest single gold mines in Canada (all amounts in Canadian dollars unless otherwise stated)

Vancouver, British Columbia – Artemis Gold Inc. (TSX-V: ARTG) (“Artemis Gold” or the “Company”) announces board approval for an expanded Phase 2 (“EP2”) development of the Blackwater Mine located in central British Columbia. EP2 represents a significant addition to processing plant capacity from the previously announced Phase 1A project, which is currently in construction, growing from an expected 8 million tonnes per annum (“Mtpa”) before the end of 2026 to 21 Mtpa before the end of 2028. Once EP2 is in production, the Blackwater Mine is expected to produce an average of 500,000 to 525,000 ounces of gold for the first 10 full years. The EP2 investment decision is conditional upon receipt of formal confirmation of adequate hydro-electricity supply from BC Hydro, expected in early 2026.

The Company estimates that EP2 will be completed at a capital cost of $1.44 billion which compares favourably with prior expansion study estimates and industry benchmarks on a per tonne of throughput capacity basis (EP2 capital intensity $110 per tonne of additional annual throughput). EP2 is expected to be funded primarily from operating cash flows and is supported by the Company’s strengthened balance sheet which provides financial flexibility to fund growth.

The EP2 project is consistent with the staged development strategy and plan for the Blackwater Mine as contemplated in the current technical report entitled “Blackwater Gold Mine, British Columbia, NI 43-101 Technical Report on 2024 Expansion Study” with an effective date of February 21, 2024 (the “2024 Expansion Study”). The strong gold price environment and the previously announced Phase 1A expansion have allowed the Company to optimize EP2 at a larger scale compared to the previous Phase 2 expansion plan in the 2024 Expansion Study. EP2 is based on the Blackwater Mine’s existing Proven and Probable Mineral Reserves as outlined in the 2024 Expansion Study and no changes have been made to the Mineral Reserve and Mineral Resource estimates.

EP2 increases gold production to over 500,000 ounces per year and economies of scale provide for lower unit operating costs, which will cement the Blackwater Mine’s position as one of the lowest-cost and highest-margin gold operations globally and transforms the mine into one of the three largest single gold mines in Canada. All-in sustaining costs¹ (“AISC”) are expected to be in the range of US$800 to US$1,100 per ounce of gold sold in the next 10 years. At current spot gold prices of approximately US$4,200 per ounce, this translates into an AISC margin¹ of over US$3,000 per ounce of gold sold, or approximately 75% margin on revenue.

Early works for EP2 are set to commence in January 2026, with major works construction scheduled to begin in Q3 2026 and continue for approximately two years. At peak construction, EP2 is expected to generate 1,500 direct construction jobs, plus additional indirect jobs and indirect and induced economic activity. This is in addition to the approximately 900 contractors and direct employees currently working at the Blackwater Mine to operate Phase 1. Once EP2 is completed, the Blackwater Mine is expected to employ approximately 1,200 direct employees and contractors.

Artemis Gold CEO Dale Andres commented: “The Blackwater Mine is a world-class, large-scale asset in a tier-one mining jurisdiction that is delivering low-cost production and strong cash flows. Our consistent long-term vision for the Blackwater Mine has been to grow low-cost production to at least 500,000 gold ounces per year through staged, capital-efficient expansions funded primarily by cash flow from operations. EP2 delivers on our long-term vision and now is an opportune time to embark on this next phase of growth. We have a strong and experienced team in place who successfully delivered Phase 1, and we have strong cash flows and a solid balance sheet that will allow us to build EP2 without diluting our equity holders.

“We look forward to continuing to work collaboratively with our Indigenous partners, local communities and the provincial and federal governments to responsibly develop the Blackwater Mine. EP2 will expand the Blackwater Mine to be one of the largest gold mines in Canada and will generate significant economic and other community benefits for many years to come.”

Artemis Gold President Jeremy Langford commented: “The decision to proceed with EP2 is another major milestone for the Company. Since achieving commercial production in May, we have been working diligently on optimizing and right sizing the EP2 plant design to deliver the next stage of growth for the Blackwater Mine, in parallel with advancing Phase 1A design and construction.

“We are being disciplined in our approach to planning for the successful delivery of EP2, allowing for sufficient time through Q3 2026 to advance engineering and procurement together with early works activities which allow us to hit the ground running when major works construction activities are scheduled to commence in Q3 2026.”

Production and Cost Guidance

Based on the Company’s currently approved development plans, including the EP2 project, the following table shows long-term production and cost guidance in relation to previously announced updated guidance for 2025. Annual guidance for 2026 will account for additional downtime expected to tie-in the Phase 1A expansion project and is expected to be provided in January 2026. Gold production in 2026 is expected at the lower end of the three-year range and AISC¹ at the higher end of the three-year range for the expansion period.

1 Refer to Non-IFRS Measures. All-in sustaining costs are presented on an asset level basis and include production costs, selling costs and royalties, sustaining capital costs, equipment finance costs beyond the expansion period, less silver by-product credits and changes in inventory, divided by payable gold ounces.  Except for 2025, they do not include regional and corporate general and administrative expense and other non-cash items which may be included in our annual guidance in early 2026 and beyond.

Processing plant throughput rates are expected to average between 8 and 9 Mtpa for the next three years with 2026 expected to be at an annual rate of about 6.5 Mtpa until Phase 1A is fully ramped up by the end of 2026. After the expansion period, the processing plant is expected to run at the full production rate of 21 Mtpa, not including any further optimization potential or future Phase 3 expansion.  Mill recoveries are expected to average 90% for the next three years and then average 93% after the construction of both the Phase 1A and EP2 circuits.

Expanded Phase 2 Project Update

The EP2 project is consistent with the staged development strategy and plan for the Blackwater Mine as contemplated in the current technical report entitled “Blackwater Gold Mine, British Columbia, NI 43-101 Technical Report on 2024 Expansion Study” with an effective date of February 21, 2024 (the “2024 Expansion Study”).

The processing plant for EP2 has a design throughput capacity of 13 Mtpa, which combined with Phase 1A (8 Mtpa) will increase the total throughput capacity of the Blackwater Mine to 21 Mtpa. This compares to the 2024 Expansion Study which had a 9 Mtpa Phase 2 plant expansion, increasing design capacity to 15 Mtpa from the original Phase 1 design of 6 Mtpa.

The Phase 3 expansion to reach a 25 Mtpa processing rate, referenced in the 2024 Expansion Study, is expected to be largely achieved through continued debottlenecking and optimization of the Phase 1/1A and EP2 processing plants, with only modest further capital requirements anticipated to support these efforts in the future. There is also potential for any Phase 3 expansion to be larger than 25 Mtpa in the future and for mine life extension with re-optimization of the mine plan and potential mineralization expansion. An update to the Mineral Resources and Mineral Reserve estimates is expected in 2026.

The EP2 processing plant is designed as a separate facility located adjacent to the existing Phase 1 processing plant. This will allow for the segregation of Phase 1 operating activities from EP2 construction activities to ensure minimal disruption to current operations during EP2 construction and commissioning.

Front-end engineering and design for EP2 was completed in December 2025, along with detailed project execution plans. Planning activities for early works and construction are well advanced. The Company has already placed orders for several long lead time items, including for the primary grinding mills and construction camps. In September 2025, orders were placed for both an 18 megawatt (“MW”) semi-autogenous grinding (“SAG”) mill and an 18 MW ball mill. The ball mill is already fully fabricated due to cancellation by another customer. These orders, along with the dedicated early works phase through Q3 2026, are expected to significantly de-risk the EP2 schedule.

Early works activities for EP2 are expected to start in January 2026 and will focus on key activities needed to facilitate timely construction, including installation of a new construction camp, additional geotechnical site investigation, earthworks, and further progressing detailed design and procurement activities. Major works construction is expected to commence in Q3 2026 and is anticipated to last approximately two years, with the first gold pour expected in Q3 2028 and full production rates before the end of 2028.

At the EP2 processing rate, the mine life is expected to be through to 2043, with the final five years of processing from stockpiles. There is also potential to further extend the mine life beyond 2043 and to further expand or optimize processing rates as further described below.

The EP2 project and associated production and cost guidance is based on the Blackwater Mine’s existing Proven and Probable Mineral Reserves in the 2024 Expansion Study. Artemis Gold is not aware of any new information or data that materially affects the information included in the 2024 Expansion Study other than changes due to normal mining depletion, and, in relation to the estimates of the Blackwater Mine’s Mineral Reserve and Mineral Resource estimates, that all material assumptions and technical parameters underpinning the estimates in the 2024 Expansion Study continue to apply and have not materially changed.

Expanded Phase 2 Processing Plant Design

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