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COMMITMENTS AND CONTINGENCIES - Reclamation Bonds (Details) - USD ($) $ in Millions |  | 6 Months Ended
--- | --- | ---
Jun. 23, 2017 | Jun. 30, 2017
Reclamation Bonds |  |
Surety bonds upfront deposit amount |  | $ 0.5
Outstanding surety bonds |  | $ 4.9
Reclamation Bonds |  |
Reclamation Bonds |  |
Face amount | $ 20.0 |
Percentage of annual fees on surety bonds | 2.00% |
Surety bonds upfront deposit amount | $ 0.0 |

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- Details
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