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COMMITMENTS AND CONTINGENCIES: - Labor matters (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 USD ($) item employee | Dec. 31, 2021 PEN (S/) item | Dec. 31, 2021 USD ($) 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 |  |

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- Definition Number of labor unions with whom extension of collective agreement is signed. + References No definition available. + Details
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- Definition Represents the amount of budgeted cost for rehabilitation of mine. + References No definition available. + Details
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- Definition Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(4)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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