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PROPERTY, PLANT AND EQUIPMENT - Additional Information for Rollforward (Details)
 12 Months Ended
Jan. 19, 2018
USD ($)
May 31, 2017
USD ($)
Jan. 16, 2017
USD ($)
installment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2017
Feb. 28, 2017
Disclosure of detailed information about property, plant and equipment [line items]              
Number of years purchaser allowed to evaluate project per option agreement       3 years      
Discount rate used for future cash payments           20.00%  
Impairment loss recognised in profit or loss, property, plant and equipment         $ (2,466,000)    
Write-down of held for sale asset       $ 0 2,466,000    
Puna Operations Inc.              
Disclosure of detailed information about property, plant and equipment [line items]              
Useful life of property, plant and equipment   8 years   8 years      
Plant and equipment              
Disclosure of detailed information about property, plant and equipment [line items]              
Construction in progress       $ 17,307,000 6,113,000    
Mineral properties subject to depreciation              
Disclosure of detailed information about property, plant and equipment [line items]              
Construction in progress       3,715,000 $ 1,833,000    
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        
Exploration and evaluation assets | Berenguela project              
Disclosure of detailed information about property, plant and equipment [line items]              
Discount rate used for future cash payments             15.00%
Pirquitas plant assets              
Disclosure of detailed information about property, plant and equipment [line items]              
Discount rate used for future cash payments   10.00%          
Amount unit's asset balance prior to impairments exceeds its carrying amount   $ 24,357,000          
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 $ (10,564,000)    
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 (144,000)    
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       45,295,000 52,753,000    
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         52,609,000    
Gross carrying amount | Exploration and evaluation assets              
Disclosure of detailed information about property, plant and equipment [line items]              
Transfers       0 $ (23,415,000)    
Impairment loss recognised in profit or loss, property, plant and equipment       $ 899,000