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COMMITMENTS AND CONTINGENCIES: - Labor matters (Details)
 1 Months Ended 12 Months Ended
Nov. 30, 2019
PEN (S/)
Nov. 30, 2019
USD ($)
May 31, 2019
PEN (S/)
May 31, 2019
USD ($)
Mar. 31, 2019
PEN (S/)
item
Mar. 31, 2019
USD ($)
item
Aug. 31, 2018
PEN (S/)
item
Aug. 31, 2018
USD ($)
item
Jun. 30, 2018
PEN (S/)
Jun. 30, 2018
USD ($)
Dec. 31, 2020
USD ($)
item
employee
Aug. 22, 2018
USD ($)
Labor Matters                        
Labor matters                        
Annual salary increase (as a percent) 5.00% 5.00% 5.50% 5.50%                
Labor Matters | Year One Collective Bargaining Agreement                        
Labor matters                        
Term of agreement     1 year 1 year                
Labor expense   $ 13,300 S/ 16,000 $ 4,800                
Labor Matters | Year Three Collective Bargaining Agreement                        
Labor matters                        
Term of agreement 3 years 3 years                    
Labor expense | S/ S/ 45,000                      
Peru | Labor Matters                        
Labor matters                        
Percentage of labor unionized                     66.00%  
Total number of workers | employee                     4,739  
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         S/ 45,000 $ 13,600 S/ 45,000 $ 13,600 S/ 45,000 $ 13,600    
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 | $                     $ 86,400,000