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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - (Details) | 12 Months Ended
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Dec. 31, 2017 multiple $ / oz $ / bbl | Dec. 31, 2016 multiple $ / oz $ / bbl
Gold |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Estimated price for next twelve months | 1,300 | 1,200
Estimated price second fiscal year | 1,300 | 1,250
Estimated long-term price | 1,300 | 1,250
Silver |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Estimated price for next twelve months | 19.00 | 18.50
Estimated price second fiscal year | 19.00 | 18.70
Estimated long-term price | 19.00 | 20.00
WTI oil |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Estimated short-term and long-term price | $ / bbl | 55 | 60
Minimum |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Useful life of mobile and other equipment | 2 years |
Projected cash flow period | P9Y |
Real discount rate | 4.35% | 5.05%
Net asset value multiple | multiple | 0.8 | 0.7
Maximum |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Maximum measurement period for business combinations | 1 year |
Useful life of mobile and other equipment | 10 years |
Projected cash flow period | P25Y |
Real discount rate | 7.10% | 5.18%
Net asset value multiple | multiple | 1.6 | 1.5

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