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INCOME AND MINING TAXES (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
INCOME AND MINING TAXES      
Current income and mining tax expense   $ 2.6 $ 4.1
Deferred income and mining tax expense $ 1.9 (3.0) (14.5)
Adjustments for deferred tax of prior year   (4.9) 4.7
Total income tax expense (recovery)   (0.4) (10.4)
Canada [Member]      
INCOME AND MINING TAXES      
Current income and mining tax expense   2.2 4.2
Deferred income and mining tax expense   1.9 (19.2)
Foreign [Member]      
INCOME AND MINING TAXES      
Current income and mining tax expense   $ 0.4 $ (0.1)