CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
OPERATING EXPENSES:
Exploration and evaluation	$ 527	$ 789
General and administrative expense	3,643	9,553
Loss on Sale of non-core properties and assets	2,885
TOTAL OPERATING EXPENSES	7,055	10,342
(LOSS) FROM OPERATIONS	(7,055)	(10,342)
OTHER INCOME/(EXPENSE):
Interest expense	(845)	(774)
TOTAL OTHER (EXPENSE)/INCOME, NET	(845)	(774)
(LOSS) BEFORE INCOME TAXES	(7,900)	(11,116)
CONSOLIDATED NET (LOSS)	(7,900)	(11,116)
Less: Net loss attributable to CRNCI	22	372
NET LOSS ATTRIBUTABLE TO GMI	$ (7,878)	$ (10,744)
Basic and diluted net loss attributable to GMI per share of common stock (in dollars per share)	$ (0.06)	$ (0.08)
Weighted average number of shares outstanding - basic and diluted (in shares)	138,784	129,421
COMPREHENSIVE (LOSS)	$ (7,878)	$ (10,744)