Contract Liabilities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2023 USD ($) mill sub-stationTransformer	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) sub-stationTransformer	Aug. 31, 2022 mill
Long-Lived Assets Held-for-sale [Line Items]
Assets held for sale	$ 1,150		$ 1,050
Contract liabilities - assets held for sale	0	$ 1,890
Number of transformers | sub-stationTransformer			1
Equipment not in use
Long-Lived Assets Held-for-sale [Line Items]
Assets held for sale	1,150		$ 1,050
SAG Mill And Ball Mill
Long-Lived Assets Held-for-sale [Line Items]
Contract liabilities - assets held for sale	1,200
Non refundable option payments amount due	$ 12,400
SAG Mill
Long-Lived Assets Held-for-sale [Line Items]
Number of mills | mill	1			1
Ball Mill
Long-Lived Assets Held-for-sale [Line Items]
Number of mills | mill	1			1
Sub-Station Transformer
Long-Lived Assets Held-for-sale [Line Items]
Number of transformers | sub-stationTransformer	1