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Inventories (Tables)
 3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of inventory The following table provides the components of Inventories and the estimated recoverable gold ounces therein (dollars in thousands):
March 31, 2021December 31, 2020
AmountGold OuncesAmountGold Ounces
Materials and supplies$6,282 — $6,449 — 
Merrill-Crowe process plant5,753 3,300 4,810 2,587 
Carbon-in-column2,750 1,703 299 166 
Finished good (doré and off-site carbon)4,165 2,489 1,309 710 
Total$18,950 7,492 $12,867 3,463 
Schedule of inventory, Ore on leach pads
The following table summarizes Ore on leach pads and the estimated recoverable gold ounces therein (dollars in thousands):
March 31, 2021December 31, 2020
AmountGold OuncesAmountGold Ounces
Ore on leach pads, current$33,090 20,140 $38,041 21,869 
Ore on leach pads, non-current9,243 5,626 7,243 4,164 
Total$42,333 25,766 $45,284 26,033