Hecla Mining — May 1, 2025 release

Casa Berardi guidance for cost of sales (includes depreciation) is revised up to $180 million from $165.5 million due to increased open pit contractor costs related to extending the work by two months from the prior plan, and other cost increases. Cash cost guidance (after by-product credits, per gold ounce) is unchanged at $1,500-$1,650/oz and AISC (after by-product credits, per gold ounce) guidance is also unchanged at $1,750-$1,950/oz. 3,4 First quarter cash costs and AISC are above the full year guidance ranges on a pro rata basis but are in line with the Company's expectations and should improve in second half 2025 for the reasons noted above, with the fourth quarter expected to benefit the most in terms of cost improvement. Total capital investment guidance for 2025 is unchanged at $58-$63 million. Capital investment at Casa Berardi is expected to increase over the second and third quarters due to seasonal construction period plans, with tailings construction being a major factor in the expected increase during the warmer months of the year. Casa Berardi is expected to have 3-6 days of planned maintenance in the second quarter, which is the historical norm for quarterly maintenance downtime at the mine.   Casa Berardi is expected to produce gold from the 160 pit and associated stockpiles until 2027. At current gold prices, the 160 pit is expected to generate strong free cash flow late third quarter (when the pit's strip ratio is expected to decline) until 2027. Upon completion of mining at the 160 pit, and milling the remaining stockpiles, Casa Berardi is expected to have a production gap commencing in 2027