CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets:
Cash and cash equivalents	$ 106,210	$ 141,984
Prepaids and deposits – Note 3	3,326	2,840
Supplies inventories, net – Note 4	1,834	2,808
Income tax receivable	1,530	1,530
Interest receivable	667	459
Accounts receivable	0	2,771
Current assets	113,567	152,392
Property, plant, and equipment, net – Note 5	53,091	54,832
Restricted cash – Note 6	26,340	33,982
Assets held for sale – Note 7	7,148	7,148
Prepaid Expense, Noncurrent	1,547	600
Prepaids – Note 3	600	600
Total assets	201,693	248,954
Liabilities:
Asset retirement obligation – Note 8	3,172	0
Debt, net – Note 9	2,330	2,328
Accounts payable and accrued expenses – Note 10	1,631	5,644
Contract liabilities – Note 11	1,550	1,050
Other liabilities – Note 12	3,063	3,011
Current liabilities	11,746	12,033
Debt, net – Notes 9 and 21	142,617	132,690
Deferred gain on sale of royalty – Note 13	29,839	29,837
Asset retirement obligation – Note 8	4,801	10,302
Warrant liabilities – Notes 14 and 21	26	786
Other liabilities – Note 12	8	0
Total liabilities	189,037	185,648
Commitments and contingencies – Note 23
Stockholders’ equity – Note 15
Common stock, $0.0001 par value; 1,400,000,000 shares authorized; 20,736,612 issued and outstanding at December 31, 2023, and 20,027,060 issued and outstanding at December 31, 2022	21	20
Additional paid-in capital	737,810	733,437
Accumulated deficit	(725,175)	(670,151)
Total stockholders’ equity	12,656	63,306	[1]
Total liabilities and stockholders’ equity	$ 201,693	$ 248,954

[1] The opening balance of shares of common stock outstanding for both periods presented reflects an increase of six shares of common stock for an adjustment made to the Company’s share ledger by its recordkeeper related to a transaction that occurred in May 2020.