Arctic Minerals has increased the estimated contained copper-equivalent metal at its Hennes Bay project in southwestern Sweden by 72% to 936,000 tonnes, strengthening prospects for a significant new European copper-silver development.
The updated JORC-compliant resource totals 90.7 million tonnes grading 1.03% copper equivalent, containing approximately 682,000 tonnes of copper and 60.9 million ounces of silver.
The revised estimate covers six deposits across the Dalsland region and introduces 27 million tonnes of Indicated resources, with the remaining 63.7 million tonnes classified as Inferred. The project is advancing towards economic studies, although mineral reserves, construction approval and project financing have not been established.
Six Deposits Expand the Resource Base
The updated resource includes Dingelvik, Asslebyn, Henneviken, Baldersnäs, Åsnebo and Härserud Norra.
Dingelvik remains the largest deposit, with 65.9 million tonnes grading 1.04% copper equivalent, containing approximately 500,000 tonnes of copper and 44.5 million ounces of silver. Its contained copper-equivalent resource increased by 26% compared with the previous estimate.
The five additional deposits contribute 24.8 million tonnes grading 1.01% copper equivalent, containing approximately 183,000 tonnes of copper and 16.3 million ounces of silver.
Henneviken has the highest reported copper-equivalent grade among the satellite deposits, at 1.41%, while Asslebyn contributes another 7.8 million tonnes grading 1.02%.
The multiple-deposit configuration could eventually support an integrated mining and processing operation, although its technical and economic feasibility remains to be demonstrated.
Drilling Strengthens Geological Confidence
The resource update incorporates historical exploration and recent drilling. The project database contains 135 diamond drill holes covering 17,549 metres, including ten new holes totalling 3,459 metres.
At Henneviken, drill hole 2608 intersected 46.87 metres grading 1.36% copper and 28 grams per tonne silver, including 36.13 metres grading 1.62% copper and 31 grams per tonne silver.
Mineralisation at Dingelvik was also extended by up to 465 metres down dip.
The introduction of Indicated resources improves geological confidence, although approximately 70% of the total resource remains Inferred and requires further drilling.
The reported 72% increase also reflects the inclusion of five additional deposits and revised geological and economic assumptions. The latest model uses copper at US$12,000 per tonne, silver at US$60 per ounce, copper recovery of 90% and silver recovery of 75%. Consequently, the previous and updated estimates are not directly comparable.
Further Exploration Could Expand the Swedish Copper Project
The Hennes Bay licence package covers approximately 414 square kilometres, with less than 5% of the prospective geological horizon tested through drilling.
Arctic Minerals interprets the deposits as part of a broader sediment-hosted stratiform copper system, with potential for additional mineralisation beyond the existing resource boundaries. Further exploration will target resource extensions, new prospects and improved geological confidence.
European Copper Supply Adds Strategic Importance
The project is progressing as Europe seeks to strengthen access to copper for electricity networks, renewable energy, electrification and industrial manufacturing.
The EU Critical Raw Materials Act identifies copper as a strategic raw material, supporting efforts to expand European extraction, processing and recycling capacity. Hennes Bay could contribute to Sweden’s established mining industry, with its substantial silver content potentially providing an additional revenue stream.
Economic Assessment and Permitting Ahead
Arctic Minerals is preparing technical work for a preliminary economic assessment, alongside environmental studies and preparations for an exploitation-concession application.
Key issues include mining methods, processing capacity, infrastructure requirements, capital expenditure, operating costs and the potential development sequence for the six deposits.
The project has not yet demonstrated commercial viability, and its reported resources cannot be treated as economically recoverable reserves.
The next milestones include further drilling, metallurgical testing, economic assessment and regulatory progress. The expanded resource establishes Hennes Bay as a promising Swedish copper-silver development, but its commercial potential will depend on technical studies, financing and environmental approvals.
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