Revenues - Disaggregation of revenue (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2023 USD ($) oz	Sep. 30, 2022 USD ($) oz	Sep. 30, 2023 USD ($) oz	Sep. 30, 2022 USD ($) oz
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 8,758	$ 0	$ 21,755
Customer concentration risk \| Revenue \| Customer A
Disaggregation of Revenue [Line Items]
Concentration risk percentage		98.90%		51.30%
Gold sales
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 8,456	$ 0	$ 21,057
Ounces Sold \| oz	0	4,817	0	11,557
Silver sales
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 302	$ 0	$ 698
Ounces Sold \| oz	0	15,131	0	32,010

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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+ Details