CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets:
Cash and cash equivalents	$ 106,911	$ 141,984
Prepaids and deposits – Note 3	3,674	2,840
Materials and supplies inventories, net – Note 4	2,812	2,808
Income tax receivable	1,530	1,530
Interest receivable	518	459
Accounts receivable	0	2,771
Current assets	115,445	152,392
Property, plant, and equipment, net – Note 5	53,533	54,832
Restricted cash – Note 6	35,087	33,982
Assets held for sale – Note 7	7,148	7,148
Prepaids – Note 3	600	600
Total assets	211,813	248,954
Liabilities:
Accounts payable and accrued expenses – Note 8	2,542	5,644
Debt, net – Notes 9 and 20	2,328	2,328
Contract liabilities – Note 10	1,150	1,050
Other liabilities – Note 11	2,438	3,011
Current liabilities	8,458	12,033
Debt, net – Notes 9 and 20	140,041	132,690
Deferred gain on sale of royalty	29,837	29,837
Asset retirement obligation – Note 12	10,860	10,302
Warrant liabilities – Notes 13 and 20	21	786
Other liabilities – Note 11	17	0
Total liabilities	189,234	185,648
Commitments and contingencies – Note 22
Stockholders’ equity – Note 14
Common stock, $0.0001 par value; 1,400,000,000 shares authorized; 202,132,839 issued and outstanding at September 30, 2023, and 200,270,659 issued and outstanding at December 31, 2022	20	20
Additional paid-in capital	736,220	733,437
Accumulated deficit	(713,661)	(670,151)
Total stockholders’ equity	22,579	63,306
Total liabilities and stockholders’ equity	$ 211,813	$ 248,954