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COMMITMENTS AND CONTINGENCIES: - Labor matters (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2019
PEN (S/)
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Mar. 31, 2019
USD ($)
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Aug. 31, 2018
USD ($)
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Jun. 30, 2018
Dec. 31, 2018
PEN (S/)
Sep. 30, 2018
PEN (S/)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
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Aug. 22, 2018
USD ($)
Peru | Labor Matters                  
Labor matters                  
Percentage of labor unionized               64.00%  
Total number of workers               4,862  
Number of labor unions               6  
Number of labor unions represent majority of workers               1  
Number of labor unions other than majority workers unions               5  
Term of agreement     3 years 3 years          
Annual salary increase (as a percent) 5.00% 5.00%     5.00% 5.00% 5.00%    
Labor expense S/ 45,000 $ 13,600 $ 13,600   S/ 45,000 S/ 45,000 $ 13,600    
Number of additional unions 1 1 3            
Mexico | San Martin                  
Labor matters                  
Budgeted cost for rehabilitation of mine | $                 $ 87,000,000
Total expense incurred on rehabilitation of mine till date | $               $ 70,200,000