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Impairment of Non-Current Assetes (Tables)
12 Months Ended
Dec. 31, 2020
Impairment and Reversal of Impairment and Goodwill [Abstract]  
Sensitivity analysis of metal prices
Metal prices used at December 31, 2019: 
Metal Prices2020-2023 average
Silver price - $/oz.$17.94
Gold price - $/oz.$1,474