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COMMITMENTS AND CONTINGENCIES: - Labor matters (Details)
 1 Months Ended 9 Months Ended
Jul. 22, 2021
PEN (S/)
Jul. 22, 2021
USD ($)
Dec. 31, 2021
Sep. 30, 2021
USD ($)
item
Jun. 30, 2021
PEN (S/)
Jun. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
item
employee
Jul. 12, 2021
item
Peru | Labor Matters                
Labor matters                
Percentage of labor unionized       70.40%     70.40%  
Total number of workers | employee             4,645  
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         4 years 4 years    
Extended term of agreement 6 years 6 years            
Annual salary increase (as a percent)     5.00% 5.00%        
Labor expense S/ 90,000 $ 21,760     S/ 60,000 $ 14,507    
Number of labor unions of collective agreement signed               2
Long term agreement bonus S/ 10,000 $ 2,418            
Number of unions decided to forego advancing conversation       6     6  
Mexico | San Martin                
Labor matters                
Budgeted cost for rehabilitation of mine | $       $ 90,100,000     $ 90,100,000