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COMMITMENTS AND CONTINGENCIES: - Labor matters (Details) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Nov. 30, 2019 USD ($) agreement | Nov. 30, 2019 PEN (S/) agreement | Mar. 31, 2019 USD ($) item | Mar. 31, 2019 PEN (S/) item | Aug. 31, 2018 USD ($) item | Jun. 30, 2018 | Mar. 31, 2020 USD ($) item employee | Dec. 31, 2018 PEN (S/) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 PEN (S/) | Aug. 22, 2018 USD ($)
Year Three Collective Bargaining Agreement |  |  |  |  |  |  |  |  |  |  |
Labor matters |  |  |  |  |  |  |  |  |  |  |
Labor expense | $ | $ 13,600 |  |  |  |  |  |  |  |  |  |
Labor Matters |  |  |  |  |  |  |  |  |  |  |
Labor matters |  |  |  |  |  |  |  |  |  |  |
Annual salary increase (as a percent) | 5.00% | 5.00% |  |  |  |  |  |  |  |  |
Number of agreements signed | agreement | 2 | 2 |  |  |  |  |  |  |  |  |
Labor Matters | Year One Collective Bargaining Agreement |  |  |  |  |  |  |  |  |  |  |
Labor matters |  |  |  |  |  |  |  |  |  |  |
Term of agreement | 1 year | 1 year |  |  |  |  |  |  |  |  |
Labor expense | $ 4,500 | S/ 15,000 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  | 64.80% |  |  |  |
Total number of workers | employee |  |  |  |  |  |  | 4,886 |  |  |  |
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 |  |  |  |  |
Annual salary increase (as a percent) |  |  | 5.00% | 5.00% |  |  |  | 5.00% | 5.00% | 5.00% |
Labor expense |  |  | $ 13,600 | S/ 45,000 | $ 13,600 |  |  | S/ 45,000 | $ 13,600 | S/ 45,000 |
Number of additional unions |  |  | 1 | 1 | 3 |  |  |  |  |  |
Mexico | San Martin |  |  |  |  |  |  |  |  |  |  |
Labor matters |  |  |  |  |  |  |  |  |  |  |
Budgeted cost for rehabilitation of mine | $ |  |  |  |  |  |  |  |  |  |  | $ 97,700,000
Total expense incurred on rehabilitation of mine till date | $ |  |  |  |  |  |  | $ 78,600,000 |  |  |  |

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- Definition Number of agreements signed. + 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=116634182&loc=SL114868664-224227 + Details
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