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DESCRIPTION OF THE BUSINESS: (Details) $ in Millions		3 Months Ended
	Apr. 15, 2020 USD ($)	Mar. 31, 2021 $ / lb $ / item	Mar. 31, 2020
Percentage of ownership interest held by the parent company		88.90%
Percentage of operating over production capacity during COVID-19 time			98.00%
Copper price assumption | $ / lb		2.00
Molybdenum price assumption | $ / item		4.00
Minimum
Projected discounted cash flows in excess of the carrying amounts of long lived assets by margins		1.3
Maximum
Projected discounted cash flows in excess of the carrying amounts of long lived assets by margins		4.3
Peru
Percentage workforce working on site under strict safety measures		80.00%
Percentage of workforce not working		20.00%
Mexico
Percentage workforce working on site under strict safety measures		95.00%
Percentage of workforce not working		5.00%
Fixed-rate senior unsecured notes issued April 2010
Repayment of debt | $	$ 400

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

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