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Loan payable (Details) - Precious Metals Delivery and Purchase Agreement with Macquarie Bank Ltd. [Member] - Relief Canyon [Member] - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jul. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Jan. 16, 2020
Disclosure of detailed information about borrowings [line items]        
Working capital loan       $ 0.5
Monthly fixed cash payments $ 7.2      
Financing expense     $ 1.7  
Loss on derivative option   $ 0.1