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PROPERTY, PLANT AND EQUIPMENT - Additional Information for Rollforward (Details)
 12 Months Ended
Jan. 19, 2018
USD ($)
May 31, 2017
Jan. 16, 2017
USD ($)
installment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Disclosure of detailed information about property, plant and equipment [line items]          
Number of years purchaser allowed to evaluate project per option agreement       3 years  
Puna Operations Inc.          
Disclosure of detailed information about property, plant and equipment [line items]          
Useful life of property, plant and equipment   8 years      
Plant and equipment          
Disclosure of detailed information about property, plant and equipment [line items]          
Construction in progress       $ 44,858,000 $ 17,307,000
Mineral properties subject to depreciation          
Disclosure of detailed information about property, plant and equipment [line items]          
Construction in progress       $ 0 3,715,000
Exploration and evaluation assets | Candelaria project          
Disclosure of detailed information about property, plant and equipment [line items]          
Initial proceeds from sale of productive assets     $ 1,000,000    
Number of annual installments per option agreement | installment     3    
Annual installment amount per option agreement $ 1,000,000   $ 1,000,000    
Pirquitas plant assets          
Disclosure of detailed information about property, plant and equipment [line items]          
Impairment reversal recognized         $ 24,357,000
Seabee Gold Operation          
Disclosure of detailed information about property, plant and equipment [line items]          
Discount rate used for future cash payments       2.30% 2.30%
Gross carrying amount          
Disclosure of detailed information about property, plant and equipment [line items]          
Transfers       $ 0 $ 0
Impairment loss recognised in profit or loss, property, plant and equipment         1,646,000
Gross carrying amount | Plant and equipment          
Disclosure of detailed information about property, plant and equipment [line items]          
Transfers       0 0
Impairment loss recognised in profit or loss, property, plant and equipment         0
Gross carrying amount | Mineral properties subject to depreciation          
Disclosure of detailed information about property, plant and equipment [line items]          
Transfers       33,635,000 45,295,000
Impairment loss recognised in profit or loss, property, plant and equipment         747,000
Gross carrying amount | Mineral properties subject to depreciation, net of assets held-for-sale          
Disclosure of detailed information about property, plant and equipment [line items]          
Transfers         45,295,000
Gross carrying amount | Exploration and evaluation assets          
Disclosure of detailed information about property, plant and equipment [line items]          
Transfers       $ 0 0
Impairment loss recognised in profit or loss, property, plant and equipment         $ 899,000