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RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
	May 23, 2019	Mar. 29, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Aug. 10, 2018
RELATED PARTY TRANSACTIONS
Long-term debt from related party (note 18)			$ 23,997		$ 23,997		$ 19,758
Number of units issued	1,935,484	14,193,548
Net proceeds	$ 2,600	$ 20,300
Robert McEwen | Term Loan
RELATED PARTY TRANSACTIONS
Face amount								$ 50,000
Long-term debt from related party (note 18)								$ 25,000
Affiliate of Robert McEwen
RELATED PARTY TRANSACTIONS
Debt interest expense			600	$ 600	$ 1,800	$ 1,800
Number of units issued					1,045,850
Net proceeds					$ 900
Entity Affiliated With Related Party | Lexam L.P.
RELATED PARTY TRANSACTIONS
Expense				36	87	113
Related party outstanding accounts payable			71		71		65
Entity Affiliated With Related Party | REVlaw
RELATED PARTY TRANSACTIONS
Expense			34	$ 56	122	$ 184
Related party outstanding accounts payable			$ 53		$ 53		$ 12

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