XML 97 R60.htm IDEA: XBRL DOCUMENT v3.19.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
$ / ounce
Dec. 31, 2017
USD ($)
Disclosure of detailed information about property, plant and equipment [line items]    
Write down of fixed assets $ 2,771 $ 1,719
Computer equipment | Minimum    
Disclosure of detailed information about property, plant and equipment [line items]    
Useful life of property, plant and equipment 3 years  
Computer equipment | Maximum    
Disclosure of detailed information about property, plant and equipment [line items]    
Useful life of property, plant and equipment 7 years  
Furniture and fixtures    
Disclosure of detailed information about property, plant and equipment [line items]    
Useful life of property, plant and equipment 7 years  
Vehicles | Minimum    
Disclosure of detailed information about property, plant and equipment [line items]    
Useful life of property, plant and equipment 2 years  
Vehicles | Maximum    
Disclosure of detailed information about property, plant and equipment [line items]    
Useful life of property, plant and equipment 5 years  
Mining equipment | Minimum    
Disclosure of detailed information about property, plant and equipment [line items]    
Useful life of property, plant and equipment 5 years  
Mining equipment | Maximum    
Disclosure of detailed information about property, plant and equipment [line items]    
Useful life of property, plant and equipment 10 years  
Mobile equipment components | Minimum    
Disclosure of detailed information about property, plant and equipment [line items]    
Useful life of property, plant and equipment 2 years  
Mobile equipment components | Maximum    
Disclosure of detailed information about property, plant and equipment [line items]    
Useful life of property, plant and equipment 9 years  
Pitarrilla Project | Silver    
Disclosure of detailed information about property, plant and equipment [line items]    
Write down of fixed assets $ 64,000  
Discounted cash flow, price per ounce (usd per oz) | $ / ounce 17.75  
Weighted average cost of capital, significant unobservable inputs, assets 8.50%  
Percentage of increase (decrease) in value of currency (3.00%)  
Discount rate used in current measurement of expected future proceeds from sale of assets 9.00%