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Mining Properties | 3 Months Ended
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Mar. 31, 2018
Mining Properties [Abstract] |
MINING PROPERTIES | MINING PROPERTIES Mining properties consist of the following (in thousands):
March 31, 2018 | Palmarejo |  | Rochester |  | Silvertip |  | Kensington |  | Wharf |  | La Preciosa |  | Other |  | Total
Mine development | $ | 220,141 |  |  | $ | 194,390 |  |  | $ | 70,626 |  |  | $ | 307,996 |  |  | $ | 40,688 |  |  | $ | — |  |  | $ | — |  |  | $ | 833,841 |
Accumulated amortization | (151,102 | ) |  | (146,245 | ) |  | — |  |  | (182,555 | ) |  | (16,456 | ) |  | — |  |  | — |  |  | (496,358 | )
| 69,039 |  |  | 48,145 |  |  | 70,626 |  |  | 125,441 |  |  | 24,232 |  |  | — |  |  | — |  |  | 337,483 |
Mineral interests | 629,303 |  |  | — |  |  | 245,116 |  |  | — |  |  | 45,837 |  |  | 49,085 |  |  | 7,102 |  |  | 976,443 |
Accumulated amortization | (445,327 | ) |  | — |  |  | — |  |  | — |  |  | (24,655 | ) | — |  | — |  |  | (123 | ) |  | (470,105 | )
| 183,976 |  |  | — |  |  | 245,116 |  |  | — |  |  | 21,182 |  |  | 49,085 |  |  | 6,979 |  |  | 506,338 |
Mining properties, net | $ | 253,015 |  |  | $ | 48,145 |  |  | $ | 315,742 |  |  | $ | 125,441 |  |  | $ | 45,414 |  |  | $ | 49,085 |  |  | $ | 6,979 |  |  | $ | 843,821 |
December 31, 2017 | Palmarejo |  | Rochester |  | Silvertip |  | Kensington |  | Wharf |  | La Preciosa |  | Total
Mine development | $ | 214,383 |  |  | $ | 193,881 |  |  | $ | 57,214 |  |  | $ | 298,749 |  |  | $ | 40,618 |  |  | $ | — |  |  | $ | 804,845 |
Accumulated amortization | (146,598 | ) |  | (144,390 | ) |  | — |  |  | (178,632 | ) |  | (15,748 | ) |  | — |  |  | (485,368 | )
| 67,785 |  |  | 49,491 |  |  | 57,214 |  |  | 120,117 |  |  | 24,870 |  |  | — |  |  | 319,477 |
Mineral interests | 629,303 |  |  | — |  |  | 245,116 |  |  | — |  |  | 45,837 |  |  | 49,085 |  |  | 969,341 |
Accumulated amortization | (435,215 | ) |  | — |  |  | — |  |  | — |  |  | (24,034 | ) | — |  | — |  |  | (459,249 | )
| 194,088 |  |  | — |  |  | 245,116 |  |  | — |  |  | 21,803 |  |  | 49,085 |  |  | 510,092 |
Mining properties, net | $ | 261,873 |  |  | $ | 49,491 |  |  | $ | 302,330 |  |  | $ | 120,117 |  |  | $ | 46,673 |  |  | $ | 49,085 |  |  | $ | 829,569 |
In February 2018, the Company completed the sale of Manquiri, which operates the San Bartolomé mine. Pursuant to the terms of the agreement, the Company received, among other things, a 2.0% net smelter returns royalty. Coeur estimates the value of this net smelter returns royalty to be approximately $7.1 million, which is included in Other. See Note 21 -- Discontinued Operations for additional detail. The Silvertip mine is expected to reach commercial production in the second quarter of 2018. The determination of commercial production (or ready for intended use) is based on many factors requiring the exercise of judgment. Factors that are considered when determining if intended use has been achieved include achievement of continuous production or other output, mineral recoveries at or near expected levels, the absence of routine take-downs of the plant to address commissioning issues and fix problems, and the release of the commissioning team. Prior to commercial production, costs related to mine development, construction of long-lived assets, and inventory are capitalized; all other costs are expensed in the period incurred. Amortization of mining properties will commence when the mine has been determined to be in commercial production.

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