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IMPAIRMENT OF GOODWILL AND OTHER ASSETS - Assumptions (Details) - Tanzanian Mines
 3 Months Ended
Mar. 31, 2020
USD ($)
Minimum [Member]  
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]  
Net assets value multiple $ 1.1
Weighted average cost of capital, significant unobservable inputs, assets 5.40%
Maximum [Member]  
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]  
Net assets value multiple $ 1.3
Weighted average cost of capital, significant unobservable inputs, assets 6.20%
Short-term [Member]  
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]  
Estimated Mineral Price For Measurement Of Fair Value Less Costs Of Disposal 1,350
Long-term [Member]  
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]  
Estimated Mineral Price For Measurement Of Fair Value Less Costs Of Disposal 1,300