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REVENUE AND COST OF SALES (Details 1) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Production costs $ 724 $ 1,428 $ 724 $ 10,607
Stand-by and ramp-up costs 0 875 800 875
Depreciation and depletion 319 545 1,245 1,692
Cost of sales $ 1,043 $ 2,848 $ 2,769 $ 13,174