Revenues - Disaggregation of revenue (Details) $ in Thousands	3 Months Ended
Mar. 31, 2023 USD ($) oz	Mar. 31, 2022 USD ($) oz
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 9,166
Customer concentration risk \| Revenue \| Customer A [Member]
Disaggregation of Revenue [Line Items]
Concentration risk percentage		100.00%
Gold sales
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 8,906
Ounces Sold \| oz	0	4,773
Silver sales
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 260
Ounces Sold \| oz	0	10,934

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details