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RECLAMATION AND CLOSURE COST OBLIGATIONS (Details Textual) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reclamation and closure cost obligations [Line Items]    
Percentage of annual fees of the value of outstanding letters of credit 1.50%  
Letters Of Credit [Member]    
Disclosure of reclamation and closure cost obligations [Line Items]    
Exposure to credit risk on loan commitments and financial guarantee contracts $ 110.8 $ 137.8
Bottom of range [member]    
Disclosure of reclamation and closure cost obligations [Line Items]    
Discount rate applied to cash flow projections 1.90% 1.90%
Description of inflation rates applied to cash flow projections 1.40% 1.70%
Top of range [member]    
Disclosure of reclamation and closure cost obligations [Line Items]    
Discount rate applied to cash flow projections 7.10% 6.00%
Description of inflation rates applied to cash flow projections 3.30% 3.30%