CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net loss	$ (29,114,000)	$ (32,092,000)	$ (113,522,000)	$ (77,479,000)
Adjustments to reconcile net loss for the period to net cash used in operating activities:
Non-cash portion of interest expense - Note 10			34,696,000	39,207,000
Mine site period costs - Note 4			32,024,000	0
Write-down of production inventories - Note 4	0	14,347,000	17,924,000	14,347,000
Impairment on equipment not in use - Note 5	5,331,000	0	5,331,000	0
Depreciation and amortization			4,270,000	1,233,000
Stock-based compensation - Note 14			1,991,000	697,000
Salary continuation and compensation costs			1,940,000	0
Fair value adjustment to Seller Warrants - Note 18	190,000	0	190,000	0
Accretion - Note 11	93,000	106,000	280,000	317,000
Phantom share compensation			225,000	706,000
Amortization reduction of Sprott Royalty Obligation - Note 9	(5,300)		(19,800)	0
Changes in operating assets and liabilities:
Accounts receivable			(500,000)	0
Production-related inventories			(71,787,000)	(25,852,000)
Materials and supplies inventories			(2,094,000)	(1,072,000)
Prepaids and other assets, current and non-current			(2,765,000)	(25,000)
Accounts payable			6,926,000	4,270,000
Other liabilities, current and non-current			497,000	6,000
Interest payable			(818,000)	(450,000)
Net cash used in operating activities			(85,212,000)	(44,095,000)
Cash flows used in investing activities:
Additions to plant, equipment, and mine development			(19,237,000)	(10,809,000)
Net cash used in investing activities			(19,237,000)	(10,809,000)
Cash flows from financing activities:
Proceeds from Sprott Royalty Obligation - Note 3 and 9			30,000,000	0
Proceeds from Recapitalization Transaction - Note 3			10,419,000	0
Proceeds from warrant exercise			1,000	0
Transaction and issuance costs			(15,801,000)	(3,075,000)
Net cash provided by financing activities			106,641,000	48,844,000
Net increase (decrease) in cash and restricted cash			2,192,000	(6,060,000)
Cash and restricted cash, beginning of period			48,967,000	52,861,000
Cash, end of period	51,159,000	46,801,000	51,159,000	46,801,000
Reconciliation of cash and restricted cash:
Cash	11,505,000	4,963,000	11,505,000	4,963,000
Restricted cash - current	0	2,518,000	0	2,518,000
Restricted cash - non-current	39,654,000	39,320,000	39,654,000	39,320,000
Total cash and restricted cash	$ 51,159,000	$ 46,801,000	51,159,000	46,801,000
Sprott Credit Agreement
Cash flows from financing activities:
Proceeds from issuance of debt			68,600,000	0
1.25 Lien Notes
Cash flows from financing activities:
Proceeds from issuance of debt			44,841,000	51,919,000
First Lien Agreement
Cash flows from financing activities:
Repayment of debt			(125,468,000)	0
Promissory Note
Cash flows from financing activities:
Repayment of debt			(6,914,000)	0
Private placement
Cash flows from financing activities:
Proceeds from issuance of equity			75,963,000	0
Forward purchase contract
Cash flows from financing activities:
Proceeds from issuance of equity			$ 25,000,000	$ 0