LIQUIDITY - Cash Commitments (Details) $ in Millions	Mar. 31, 2017 USD ($)
Cash commitments under equipment contracts
2017	$ 0.4
2019	1.4
2020	0.4
Total	$ 2.2
Purchase Commitment | Mining and milling equipment | POS-Minerals Corporation
Cash commitments under equipment contracts
Percentage of commitments funded	20.00%
Purchase Commitment | Mining and milling equipment | Nevada Moly LLC
Cash commitments under equipment contracts
Percentage of commitments funded	80.00%