| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Revenues: |
| Greens Creek | 384.8 | 327.8 | 299.7 | 265.7 | 278.3 | 260.4 | 227.8 | 245.2 |
| Casa Berardi | 245.2 | 209.2 | 192.9 | 210.3 | 192.2 | 177.1 | 149.4 | 165.8 |
| San Sebastian | | | | 50.2 | 85.8 | 113.9 | | |
| Lucky Friday | 131.5 | 63.0 | 16.6 | 9.8 | 21.6 | 94.5 | 66.3 | 89.8 |
| Other | 46.0 | 91.8 | 164.0 | 31.2 | | | | |
| Total revenues [+] | 807.5 | 691.9 | 673.3 | 567.1 | 577.8 | 646.0 | 443.6 | 500.8 |
| Products | 807.5 | 691.9 | 673.3 | | | | 443.6 | 500.8 |
| Revenue growth [+] | 16.7% | 2.8% | 18.7% | -1.8% | -10.6% | 45.6% | -11.4% | 30.9% |
| Greens Creek | 17.4% | 9.4% | 12.8% | -4.5% | 6.9% | 14.3% | -7.1% | -6.9% |
| Casa Berardi | 17.2% | 8.4% | -8.3% | 9.5% | 8.5% | 18.5% | -9.9% | 120.8% |
| San Sebastian | | | | -41.4% | -24.7% | | | |
| Lucky Friday | 108.6% | 279.2% | 70.5% | -54.8% | -77.2% | 42.5% | -26.1% | 103.1% |
| Cost of goods sold [+] | 603.9 | 541.6 | 643.7 | 489.6 | 427.8 | 465.1 | 520.9 | 417.9 |
| Cost of product sales | | | | | | | 405.1 | 304.4 |
| Depreciation and amortization | | | | | | | 112.7 | |
| Gross profit | 203.6 | 150.2 | 29.6 | 77.5 | 149.9 | 180.8 | -77.3 | 82.9 |
| Gross margin | 25.2% | 21.7% | 4.4% | 13.7% | 26.0% | 28.0% | -17.4% | 16.6% |
| Selling, general and administrative [+] | 34.6 | 35.6 | 35.8 | 36.5 | 35.6 | 45.0 | 34.2 | 31.5 |
| General and administrative | 34.6 | 35.6 | 35.8 | 36.5 | 35.6 | 45.0 | 34.2 | 31.5 |
| Research and development | | | | 5.4 | 3.3 | 0.2 | | |
| Other operating expenses | 121.4 | 59.5 | 45.9 | 67.4 | 57.0 | 23.6 | -78.5 | 29.8 |
| EBITDA [+] | 220.3 | 210.2 | 144.3 | 109.0 | 180.6 | 236.9 | 79.5 | 133.8 |
| EBITDA growth | 4.8% | 45.7% | 32.3% | -39.6% | -23.8% | 197.8% | -40.5% | 75.3% |
| EBITDA margin | 27.3% | 30.4% | 21.4% | 19.2% | 31.3% | 36.7% | 17.9% | 26.7% |
| Depreciation and amortization | 172.7 | 155.0 | 196.4 | 140.9 | 126.5 | 124.9 | 112.6 | 112.2 |
| EBIT [+] | 47.6 | 55.2 | -52.1 | -31.9 | 54.1 | 112.0 | -33.0 | 21.6 |
| EBIT growth | -13.7% | -205.9% | 63.5% | -158.9% | -51.7% | -438.9% | -253.0% | -455.8% |
| EBIT margin | 5.9% | 8.0% | -7.7% | -5.6% | 9.4% | 17.3% | -7.4% | 4.3% |
| Non-recurring items [+] | -35.8 | -11.8 | -5.4 | 7.3 | -6.0 | 2.5 | 2.6 | 0.0 |
| Loss (gain) on sale of assets | | | | -2.8 | -6.0 | -0.1 | 0.4 | 0.0 |
| Unusual expense | -35.8 | -11.8 | -5.4 | | | | | |
| Interest expense, net [+] | 41.9 | 49.6 | 48.4 | 40.9 | 38.0 | 21.8 | 24.5 | 26.5 |
| Interest expense | 41.9 | 49.6 | 48.4 | 40.9 | 38.0 | 21.8 | 25.4 | 26.8 |
| Interest income | | | | | | | 0.9 | 0.3 |
| Other income (expense), net [+] | -35.9 | -18.7 | -18.1 | 46.8 | -29.7 | 2.0 | 29.4 | 17.4 |
| Gain (loss) on sale of assets | 0.1 | 0.6 | 4.6 | | | | | |
| Gain (loss) on investments | | | | 0.0 | -0.2 | | 0.0 | |
| Gain (loss) on derivative instruments | | | | 40.3 | -21.3 | 4.4 | 8.3 | |
| Gain (loss) on foreign currency transactions | 0.4 | -4.6 | -8.2 | 10.3 | -9.7 | -2.7 | 24.6 | 11.5 |
| Environmental remediation expense | 14.6 | 3.9 | 4.7 | 6.1 | 6.7 | 5.7 | 12.2 | 10.1 |
| Other | 14.0 | 1.7 | 0.3 | 5.2 | 8.4 | 6.2 | 12.2 | 10.1 |
| Pre-tax income | 5.5 | -1.3 | -113.2 | -33.3 | -7.6 | 89.7 | -30.7 | 12.6 |
| Income taxes | -29.6 | 8.2 | -18.3 | -6.7 | 21.0 | 28.1 | 56.3 | 5.2 |
| Tax rate | | | 16.2% | 20.1% | | 31.3% | | 41.6% |
| Net income | 34.5 | -10.0 | -95.5 | -27.1 | -29.1 | 61.0 | -87.5 | 17.3 |
| Net margin | 4.3% | -1.4% | -14.2% | -4.8% | -5.0% | 9.4% | -19.7% | 3.4% |
| |
| Basic EPS [+] | $0.06 | ($0.02) | ($0.19) | ($0.06) | ($0.07) | $0.16 | ($0.23) | $0.05 |
| Growth | -439.4% | -90.2% | 211.1% | -14.5% | -146.3% | -167.5% | -578.9% | -160.6% |
| Diluted EPS [+] | $0.06 | ($0.02) | ($0.19) | ($0.06) | ($0.07) | $0.16 | ($0.23) | $0.05 |
| Growth | -435.7% | -90.2% | 211.1% | -14.5% | -146.7% | -167.0% | -584.3% | -160.0% |
| |
| Dividends per share [+] | $0.04 | $0.02 | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 |
| Growth | 122.1% | 55.7% | 10.0% | 1.3% | 0.0% | 0.1% | -0.4% | -46.6% |
| |
| Shares outstanding (basic) [+] | 536.2 | 527.3 | 490.4 | 433.4 | 397.4 | 386.4 | 374.0 | 353.4 |
| Growth | 1.7% | 7.5% | 13.2% | 9.1% | 2.8% | 3.3% | 5.8% | 10.9% |
| Shares outstanding (diluted) [+] | 542.2 | 527.3 | 490.4 | 433.4 | 397.4 | 389.3 | 374.0 | 357.4 |
| Growth | 2.8% | 7.5% | 13.2% | 9.1% | 2.1% | 4.1% | 4.6% | 12.2% |
| |
| EBIT is a non-GAAP figure that excludes all non-recurring expenses: restructuring costs, asset impairments, IPR&D writeoffs, and other unusual charges. |