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Mining Properties (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Mining Properties |  |
Operational mining properties: | $ 912,084 | $ 804,845
Accumulated depletion | (533,195) | (485,368)
Operational mining properties, net | 378,889 | 319,477
Mineral interest | 1,096,315 | 969,341
Accumulated depletion | (503,637) | (459,249)
Mineral interest, net | 592,678 | 510,092
Total mining properties | 971,567 | 829,569
Palmarejo [Member] |  |
Mining Properties |  |
Operational mining properties: | 239,780 | 214,383
Accumulated depletion | (163,414) | (146,598)
Operational mining properties, net | 76,366 | 67,785
Mineral interest | 629,303 | 629,303
Accumulated depletion | (472,448) | (435,215)
Mineral interest, net | 156,855 | 194,088
Total mining properties | 233,221 | 261,873
Rochester [Member] |  |
Mining Properties |  |
Operational mining properties: | 200,126 | 193,881
Accumulated depletion | (151,141) | (144,390)
Operational mining properties, net | 48,985 | 49,491
Mineral interest | 18,521 | 0
Accumulated depletion | 0 | 0
Mineral interest, net | 18,521 | 0
Total mining properties | 67,506 | 49,491
Silvertip [Member] |  |
Mining Properties |  |
Operational mining properties: | 101,933 | 57,214
Accumulated depletion | (1,411) | 0
Operational mining properties, net | 100,522 | 57,214
Mineral interest | 252,899 | 245,116
Accumulated depletion | (4,105) | 0
Mineral interest, net | 248,794 | 245,116
Total mining properties | 349,316 | 302,330
Kensington [Member] |  |
Mining Properties |  |
Operational mining properties: | 324,414 | 298,749
Accumulated depletion | (198,456) | (178,632)
Operational mining properties, net | 125,958 | 120,117
Mineral interest | 0 | 0
Accumulated depletion | 0 | 0
Mineral interest, net | 0 | 0
Total mining properties | 125,958 | 120,117
Wharf [Member] |  |
Mining Properties |  |
Operational mining properties: | 41,761 | 40,618
Accumulated depletion | (18,759) | (15,748)
Operational mining properties, net | 23,002 | 24,870
Mineral interest | 45,837 | 45,837
Accumulated depletion | (26,667) | (24,034)
Mineral interest, net | 19,170 | 21,803
Total mining properties | 42,172 | 46,673
Sterling [Member] |  |
Mining Properties |  |
Operational mining properties: | 4,070 |
Accumulated depletion | (14) |
Operational mining properties, net | 4,056 |
Mineral interest | 95,499 |
Accumulated depletion | 0 |
Mineral interest, net | 95,499 |
Total mining properties | 99,555 |
La Preciosa [Member] |  |
Mining Properties |  |
Operational mining properties: | 0 | 0
Accumulated depletion | 0 | 0
Operational mining properties, net | 0 | 0
Mineral interest | 49,085 | 49,085
Accumulated depletion | 0 | 0
Mineral interest, net | 49,085 | 49,085
Total mining properties | 49,085 | $ 49,085
Other Mining Properties [Member] |  |
Mining Properties |  |
Operational mining properties: | 0 |
Accumulated depletion | 0 |
Operational mining properties, net | 0 |
Mineral interest | 5,171 |
Accumulated depletion | (417) |
Mineral interest, net | 4,754 |
Total mining properties | $ 4,754 |

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