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COMMITMENTS AND CONTINGENCIES: - Labor matters (Details) - 12 months ended Dec. 31, 2021
PEN (S/)
item
employee
USD ($)
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employee
Peru | Labor Matters    
Labor matters    
Percentage of labor unionized   73.00%
Total number of workers | employee 4,675 4,675
Number of labor unions 6 6
Number of labor unions represent majority of workers 0 0
Extended term of agreement 6 years 6 years
Annual salary increase (as a percent) 5.00% 5.00%
Number of labor unions of collective agreement signed   6
Long term agreement bonus S/ 10,000 $ 2,501
Peru | Labor Matters | Minimum    
Labor matters    
Term of agreement 3 years 3 years
Labor expense S/ 45,000 $ 11,256
Peru | Labor Matters | Maximum    
Labor matters    
Term of agreement 6 years 6 years
Labor expense S/ 90,000 $ 22,511
Mexico | San Martin    
Labor matters    
Budgeted cost for rehabilitation of mine | $   $ 90,500,000