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COMMITMENTS AND CONTINGENCIES: - Labor matters (Details)	1 Months Ended								3 Months Ended
	Nov. 30, 2019 PEN (S/)	Nov. 30, 2019 USD ($)	May 31, 2019 PEN (S/)	May 31, 2019 USD ($)	Mar. 31, 2019 PEN (S/) item	Mar. 31, 2019 USD ($) item	Aug. 31, 2018 USD ($) item	Jun. 30, 2018	Mar. 31, 2021 USD ($) item employee	Dec. 31, 2018 PEN (S/)	Sep. 30, 2018 PEN (S/)	Sep. 30, 2018 USD ($)
Labor Matters
Labor matters
Annual salary increase (as a percent)	5.00%	5.00%	5.50%	5.50%
Labor Matters | Year One Collective Bargaining Agreement
Labor matters
Term of agreement			1 year	1 year
Labor expense	S/ 45,000	$ 13,300	S/ 16,000	$ 4,800
Labor Matters | Year Three Collective Bargaining Agreement
Labor matters
Term of agreement	3 years	3 years
Peru | Labor Matters
Labor matters
Percentage of labor unionized									65.50%
Total number of workers | employee									4,724
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					S/ 45,000	$ 13,600	$ 13,600			S/ 45,000	S/ 45,000	$ 13,600
Number of additional unions					1	1	3
Mexico | San Martin
Labor matters
Budgeted cost for rehabilitation of mine | $									$ 87,800,000

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- Definition

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- Definition

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Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit.

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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=120395209&loc=SL114868664-224227

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