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REVENUES FROM MINING OPERATIONS AND TRADE RECEIVABLES (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
customer
Dec. 31, 2016
USD ($)
Disclosure of major customers    
Provisionally concentrate sales $ 12,000 $ 8,185
Revenues from mining operations:    
Gold 2,140,890 2,049,871
Silver 86,262 85,096
Zinc 9,177 1,413
Copper 6,275 1,852
Total revenues from mining operation $ 2,242,604 $ 2,138,232
Precious metals revenue form mining operations (as a percent) 99.30% 99.80%
Customers who contribute over 10% revenue    
Disclosure of major customers    
Number of clients who account for more than 10% of revenue | customer 4  
Percentage of entity revenue from mining operations 78.10%