CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash flows used in operating activities:
Net loss	$ (88,564)	$ (136,392)
Adjustments to reconcile net loss for the period to net cash used in operating activities:
Non-cash portion of interest expense	16,812	38,843
Non-cash (gain) loss on fair value adjustment for warrant liabilities	(14,426)	3,767
Depreciation and amortization	8,429	5,849
Stock-based compensation	2,264	2,380
Accretion	408	374
Salary continuation and compensation costs - Note 9	0	2,116
Impairment charges and write-downs	17,326	23,255
Loss on sale of equipment	16	0
Phantom share compensation	0	225
Changes in operating assets and liabilities:
Accounts receivable	426	(329)
Income tax receivable	(1,530)	0
Production-related inventories	29,015	(43,756)
Materials and supplies inventories	(6,186)	(3,891)
Prepaids and other assets, net	1,690	(2,946)
Accounts payable and accrued expenses	(2,851)	372
Other liabilities	133	443
Interest payable	0	(818)
Net cash used in operating activities	(37,038)	(110,508)
Cash flows used in investing activities:
Additions to plant, equipment, and mine development	(6,990)	(33,439)
Proceeds from sales of equipment	117	2,315
Net cash used in investing activities	(6,873)	(31,124)
Cash flows (used in) provided by financing activities:
Principal payments on Sprott Credit Agreement	(5,405)	(1,158)
Principal payments on finance leases	(89)	0
Proceeds from Public Offering	0	83,515
Proceeds from sale of royalty to Sprott	0	30,000
Proceeds from Recapitalization Transaction	0	10,419
Proceeds from warrant exercise - Note 12	0	1
Transaction and issuance costs	0	(16,094)
Net cash (used in) provided by financing activities	(5,494)	188,705
Net (decrease) increase in cash and restricted cash	(49,405)	47,073
Cash and restricted cash, beginning of period	96,040	48,967
Cash and restricted cash, end of period	46,635	96,040
Reconciliation of cash and restricted cash:
Cash	12,342	56,363
Restricted cash	34,293	39,677
Total cash and restricted cash	46,635	96,040
Sprott credit agreement, noncurrent portion
Cash flows (used in) provided by financing activities:
Proceeds from issuance of debt	0	68,600
The 1.25 Lien notes
Cash flows (used in) provided by financing activities:
Proceeds from issuance of debt	0	44,841
First Lien Agreement
Cash flows (used in) provided by financing activities:
Repayments of long-term debt	0	(125,468)
Promissory Note
Cash flows (used in) provided by financing activities:
Repayments of long-term debt	0	(6,914)
Private placement
Cash flows (used in) provided by financing activities:
Proceeds from private placement and forward purchase contract	0	75,963
Forward Purchase Agreement
Cash flows (used in) provided by financing activities:
Proceeds from private placement and forward purchase contract	$ 0	$ 25,000