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SEGMENTED INFORMATION (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
OPERATING SEGMENT RESULTS      
Gold revenues   $ 434.4 $ 368.2
Copper revenues   187.3 226.1
Silver revenues   8.9 10.2
Total revenues   630.6 604.5
Operating expenses   371.9 325.4
Depreciation and depletion   240.6 239.9
Revenue less cost of goods sold   18.1 39.2
Corporate administration   17.6 23.2
Corporate restructuring [1]   1.1 4.1
Share-based payment expenses   1.7 0.7
Asset Impairment $ 671.1 0.0 1,054.8
Exploration and business development   5.6 3.0
(Loss) income from operations   (7.9) (1,046.6)
Rainy River      
OPERATING SEGMENT RESULTS      
Gold revenues   354.2 270.6
Copper revenues   0.0 0.0
Silver revenues   4.7 3.8
Total revenues   358.9 274.4
Operating expenses   258.4 179.9
Depreciation and depletion   93.9 78.3
Revenue less cost of goods sold   6.6 16.2
Corporate administration   0.0 0.0
Corporate restructuring   0.0 0.0
Share-based payment expenses   0.0 0.0
Asset Impairment     836.6
Exploration and business development   1.4 0.5
(Loss) income from operations   5.2 (820.9)
New Afton      
OPERATING SEGMENT RESULTS      
Gold revenues   80.2 83.8
Copper revenues   187.3 226.1
Silver revenues   4.2 4.2
Total revenues   271.7 314.1
Operating expenses   113.5 104.3
Depreciation and depletion   146.7 158.2
Revenue less cost of goods sold   11.5 51.6
Corporate administration   0.0 0.0
Corporate restructuring   0.0 0.0
Share-based payment expenses   0.0 0.0
Asset Impairment     0.0
Exploration and business development   3.1 0.5
(Loss) income from operations   8.4 51.1
Corporate      
OPERATING SEGMENT RESULTS      
Gold revenues   0.0 0.0
Copper revenues   0.0 0.0
Silver revenues   0.0 0.0
Total revenues   0.0 0.0
Operating expenses   0.0 0.0
Depreciation and depletion   0.0 0.0
Revenue less cost of goods sold   0.0 0.0
Corporate administration   17.6 23.2
Corporate restructuring   1.1 4.1
Share-based payment expenses   1.7 0.7
Asset Impairment     0.0
Exploration and business development   1.1 1.9
(Loss) income from operations   (21.5) (29.9)
Other segment [Member]      
OPERATING SEGMENT RESULTS      
Gold revenues   0.0 13.8
Copper revenues   0.0 0.0
Silver revenues   0.0 2.2
Total revenues   0.0 16.0
Operating expenses   0.0 41.2
Depreciation and depletion   0.0 3.4
Revenue less cost of goods sold   0.0 (28.6)
Corporate administration   0.0 0.0
Corporate restructuring   0.0 0.0
Share-based payment expenses   0.0 0.0
Asset Impairment     218.2
Exploration and business development   0.0 0.1
(Loss) income from operations   $ 0.0 $ (246.9)
[1] During 2019 and 2018, the Company recognized restructuring charges of $1.1 million and $4.1million respectively related to severance and other termination benefits.