Seabridge Gold’s KSM Resources Up by 6.8 Moz Gold and 1.5 Blb Copper

SASA

Seabridge Gold’s revised KSM Project resource estimate, applying US$2,000/oz gold and US$4.00/lb copper prices, expands measured and indicated resources by 6.8 Moz gold and 1.5 Blb copper. Inferred resources grow by 12.9 Moz gold and 4.2 Blb copper under the new price assumptions.

1. Updated Metal Price Assumptions

Seabridge Gold applied higher metal price parameters (US$2,000/oz gold, US$4.00/lb copper, US$25/oz silver, US$22/lb molybdenum) and updated operating costs to recalculate cut-offs for the KSM Project, raising Net Smelter Return thresholds and constraining mining shapes accordingly.

2. Measured and Indicated Resource Increases

Under the new assumptions, measured and indicated mineral resources expand by 6.8 million ounces of gold, 1.5 billion pounds of copper, 42.7 million ounces of silver and 93 million pounds of molybdenum, using the same grade models and geologic domains as prior studies.

3. Inferred Resource Growth

Inferred resources increase by 12.9 million ounces of gold, 4.2 billion pounds of copper, 108.8 million ounces of silver and 140 million pounds of molybdenum, reflecting only price and cost updates rather than changes to the underlying resource model.

4. Strategic Implications

The restated resources align KSM’s disclosure with Tier 1 mining standards, strengthening Seabridge Gold’s position ahead of the planned joint venture and supporting potential improvements in project valuation.

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