Information related to significant accounting policies of the reporting entity.

No definition available.

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- Definition

Represents the approximate percentage of increase in the total reserves at a property before the work qualifies as a major expansion of reserves.

+ References

No definition available.

+ Details

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- Definition

Represents the number of open-pit copper mining properties.

+ References

No definition available.

+ Details

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- Definition

Represents the number of reportable segments of the entity.

+ References

No definition available.

+ Details

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- Definition

Represents the number of underground poly metal mining properties.

+ References

No definition available.

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- Definition

Represents the number of years of average prices for copper and molybdenum used for impairment analysis.

+ References

No definition available.

+ Details

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- Definition

Represents the price per pound of copper considered to determine the average price used for the valuation of ore reserves.

+ References

No definition available.

+ Details

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- Definition

Represents the number of years preceding periods considered for the calculation of average metal prices used to determine the amortization of mine development and intangible assets.

+ References

No definition available.

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- Definition

Represents the number of months subsequent to shipping in which customer contracts allow for pricing on certain products.

+ References

No definition available.

+ Details

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319

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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

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-Name Accounting Standards Codification
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-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 958
-SubTopic 225
-Section 45
-Paragraph 11
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68048823&loc=d3e92212-112881

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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-Section 45
-Paragraph 28
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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017 USD ($) segment item $ / lb	Dec. 31, 2016 $ / lb	Dec. 31, 2015 $ / lb
Significant Accounting Policies
Increase in total reserves at a property to qualify as a major expansion (as a percent)		10.00%
Period considered for calculation of average metal price		3 years
Current price of copper (in dollars per pound) \| $ / lb		2.50	2.61	2.99
U.S. statutory rate (as a percent)		35.00%	35.00%	35.00%
Impairment in the carrying value of long-term assets \| $		$ 0.0
Number of years of average prices for copper and molybdenum used for impairment analysis		3 years
Number of reportable segments \| segment		3
Forecast
Significant Accounting Policies
U.S. statutory rate (as a percent)	21.00%
Minimum
Financial information related to segments
Estimated useful lives of buildings and equipment		5 years
Maximum
Financial information related to segments
Maximum period after shipping within which pricing is based by customer contracts in most cases		3 months
Estimated useful lives of buildings and equipment		40 years
Peruvian Operations
Financial information related to segments
Number of open-pit copper mines		2
Mexican IMMSA Unit
Financial information related to segments
Number of underground poly metal mines		5