Embedded Derivatives (Details)	12 Months Ended
	Dec. 31, 2020 $ / t oz t
Gold
Embedded Derivative [Line Items]
Under contract	4,469
Average forward price	1,872
Silver
Embedded Derivative [Line Items]
Under contract	237,252
Average forward price	24.59
Copper
Embedded Derivative [Line Items]
Under contract | t	398
Average forward price | $ / t	7,307
Lead
Embedded Derivative [Line Items]
Under contract | t	1,909
Average forward price | $ / t	1,874
Zinc
Embedded Derivative [Line Items]
Under contract | t	4,446
Average forward price | $ / t	2,634