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COMMITMENTS AND CONTINGENCIES: - Labor matters (Details)
 1 Months Ended 12 Months Ended
Nov. 30, 2019
USD ($)
agreement
Nov. 30, 2019
PEN (S/)
agreement
Mar. 31, 2019
USD ($)
item
Mar. 31, 2019
PEN (S/)
item
Aug. 31, 2018
USD ($)
item
Aug. 31, 2018
PEN (S/)
item
Jun. 30, 2018
USD ($)
Jun. 30, 2018
PEN (S/)
Dec. 31, 2019
USD ($)
item
Aug. 22, 2018
USD ($)
Labor Matters                    
Labor matters                    
Annual salary increase (as a percent) 5.00% 5.00%                
Number of agreements signed | agreement 2 2                
Labor Matters | Year One Collective Bargaining Agreement                    
Labor matters                    
Term of agreement 1 year 1 year                
Labor expense $ 4,500 S/ 15,000                
Labor Matters | Year Three Collective Bargaining Agreement                    
Labor matters                    
Term of agreement 3 years 3 years                
Labor expense $ 13,600 S/ 45,000                
Peru | Labor Matters                    
Labor matters                    
Percentage of labor unionized                 65.00%  
Total number of workers                 4,890  
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 3 years 3 years    
Annual salary increase (as a percent)     5.00% 5.00% 5.00% 5.00% 5.00% 5.00%    
Labor expense     $ 13,600 S/ 45,000 $ 13,600 S/ 45,000 $ 13,600 S/ 45,000    
Number of additional unions     1 1 3 3        
Mexico | San Martin                    
Labor matters                    
Budgeted cost for rehabilitation of mine | $                   $ 97,700,000
Total expense incurred on rehabilitation of mine till date | $                 $ 73,600,000