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COMMITMENTS AND CONTINGENCIES: - Labor matters (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
item
employee
Dec. 31, 2021
PEN (S/)
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Dec. 31, 2021
USD ($)
item
Peru | Labor Matters      
Labor matters      
Percentage of labor unionized 72.80%    
Total number of workers | employee 4,675    
Number of labor unions 6    
Number of labor unions represent majority of workers 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 6
Long term agreement bonus   S/ 10,000 $ 2,702
Peru | Labor Matters | Minimum      
Labor matters      
Term of agreement   3 years 3 years
Labor expense   S/ 45,000 $ 12,159
Peru | Labor Matters | Maximum      
Labor matters      
Term of agreement   6 years 6 years
Labor expense   S/ 90,000 $ 22,318
Mexico | San Martin      
Labor matters      
Budgeted cost for rehabilitation of mine | $ $ 90,500,000