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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Products, Properties and Production of Minerals (Details) | 12 Months Ended
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Dec. 31, 2015 oz | Dec. 31, 2014 oz | Dec. 31, 2013 shares
Maximum |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Shares issued | shares |  |  | 2,500,000
Gold and Silver | El Gallo mine |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Option to sell prior to the completion of refining (as a percent) | 90.00% |  |
Period of completion of refining | 15 days |  |
Gold and gold equivalents | El Gallo 1 mine and El Gallo 2 project | NSR royalty agreement |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Net smelter return (as a percent) | 3.50% |  |
Quantity produced (in ounces) |  | 212,200 |
Gold and gold equivalents | El Gallo 1 mine and El Gallo 2 project | Production up to 30000 ounces | NSR royalty agreement |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Net smelter return (as a percent) | 1.00% |  |
Gold and gold equivalents | El Gallo 1 mine and El Gallo 2 project | Production up to 30000 ounces | NSR royalty agreement | Maximum |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Production quantity used to determine net smelter return | 30,000 |  |
Gold and gold equivalents | El Gallo 1 mine and El Gallo 2 project | Production between 30001 to 380000 ounces | NSR royalty agreement |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Net smelter return (as a percent) | 3.50% |  |
Gold and gold equivalents | El Gallo 1 mine and El Gallo 2 project | Production between 30001 to 380000 ounces | NSR royalty agreement | Minimum |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Production quantity used to determine net smelter return | 30,001 |  |
Gold and gold equivalents | El Gallo 1 mine and El Gallo 2 project | Production between 30001 to 380000 ounces | NSR royalty agreement | Maximum |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Production quantity used to determine net smelter return | 380,000 |  |
Gold and gold equivalents | El Gallo 1 mine and El Gallo 2 project | Production above 380000 ounces | NSR royalty agreement |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Net smelter return (as a percent) | 1.00% |  |

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