SHAREHOLDERS' EQUITY (Details) $ / shares in Units, $ in Thousands, $ in Millions					6 Months Ended		12 Months Ended
	Jun. 11, 2018 shares	Dec. 19, 2017 USD ($) $ / shares shares	Sep. 22, 2017 USD ($) item $ / shares shares	Apr. 26, 2017 shares	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($) $ / shares shares	Dec. 31, 2017 CAD ($)	Dec. 31, 2017 USD ($) shares
Shareholders’ distributions					$ 1,685	$ 1,498
Semi-annual shareholders’ distribution | $ / shares					0.005	0.005
Common stock issued | shares					337,268,000			337,051,000
Weighted average exercise price of stock options (in dollars per share) | $ / shares					$ 1.14	$ 2.34
Exercise of stock options					$ 45	$ 47
Flow-through share premium					301			$ 1,643
Restricted cash for exploration activities					6,400
Restricted cash					3,621			10,000
Decrease in flow through premium					1,300
Number of units issued | shares			20,700,000
Number of warrants issued | item			10,350,000
Net proceeds			$ 43,200		39,400
Issuance costs			$ 3,400		$ 3,800
Number of warrants remained outstanding and unexercised | shares					10,350,000
Common Stock
Shareholders’ distributions					$ 1,685	$ 1,498
Shares of common stock issued upon exercise of stock options | shares					39,000	20,000
Exercise of stock options					$ 45	$ 47
Warrants
Number of common share per warrant | shares			1
Price per common share for each warrant | $ / shares			$ 2.70
Flow Through Common Shares
Flow-through share premium		$ 1,600			300
Number of units issued | shares		4,000,000
Price per unit | $ / shares		$ 2.50
Net proceeds		$ 10,000			$ 6,400		$ 12.9	$ 10,000
Share price | $ / shares		$ 2.50
Lexam
Ratio of Company's share for acquired company's share				0.056%
Lexam | Warrants
Number of units issued | shares				12,687,035
Percentage of equity acquired				100.00%
Black Fox
Number of units issued | shares	178,321