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Gold Prepay Loan (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financial Instruments [Abstract]      
Total $ 15,157 $ 6,842 $ 17,380
Less: current portion (6,920) (6,842)  
Gold prepay loan $ 8,237 $ 0