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SUBSEQUENT EVENTS (Details) - Subsequent Events $ / shares in Units, $ in Millions	Feb. 20, 2018 USD ($) T	Jan. 25, 2018 $ / shares
SUBSEQUENT EVENTS
Quarterly dividend authorized (in dollars per share) | $ / shares		$ 0.30
Michiquillay project in Cajamarca, Peru
SUBSEQUENT EVENTS
Tender proposed price | $	$ 400
Annual royalty on net sales (as a percent)	3.00%
Mineralized material (in tons) | T	1,150,000,000
Percentage of copper content in mineralized material	0.63%
Estimated capital investment | $	$ 2,500
Expected production of copper per year (in tons) | T	225,000
Minimum initial estimated mine life (in years)	25 years

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Expected production of copper per year under project acquisition.

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Mineralized material under project acquisition.

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Minimum initial estimated mine life under project acquisition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Tender proposed price under project acquisition.

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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