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SEGMENT AND RELATED INFORMATION: (Details 3) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of revenue by geographical location
Net sales	$ 1,254.6	$ 1,133.6	$ 1,382.9	$ 1,274.8	$ 1,471.3	$ 1,474.6	$ 1,487.4	$ 1,354.4	$ 5,045.9	$ 5,787.7	$ 5,952.9
Mexico
Schedule of revenue by geographical location
Net sales									1,641.0	1,708.9	1,402.8
United States
Schedule of revenue by geographical location
Net sales									862.5	1,059.3	1,028.7
Europe
Schedule of revenue by geographical location
Net sales									745.1	937.5	1,206.1
Japan
Schedule of revenue by geographical location
Net sales									445.9	447.8	583.9
Singapore
Schedule of revenue by geographical location
Net sales									369.8	299.0	117.3
Other Asian countries
Schedule of revenue by geographical location
Net sales									189.3	187.1	111.9
Brazil
Schedule of revenue by geographical location
Net sales									276.4	372.4	471.0
Chile
Schedule of revenue by geographical location
Net sales									102.0	401.5	362.8
Peru
Schedule of revenue by geographical location
Net sales									324.3	282.2	324.8
Other American countries
Schedule of revenue by geographical location
Net sales									$ 89.6	$ 92.0	$ 343.6

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Aggregate revenue from the sale of minerals and related products, and from rendering services such as exploration, development, mining, processing and providing mining support activities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a),(d))
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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