Represents the cash equivalents invested as a percentage of the total cash held by the entity as on the balance sheet.

No definition available.

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- Definition

Represents the cash equivalents invested in one institution of specified country as percentage of total cash investment in that specified country.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage of cash equivalents invested in one institution of specified country.

+ References

No definition available.

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- Definition

Represents the percentage of the entity's total cash denominated in US dollars.

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No definition available.

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- Definition

Number of open pit copper mines which represent long-lived, depletable assets that represent the legal right to explore, extract and retain some or all portions of the benefits from mining.

+ References

No definition available.

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- Definition

Represents the number of refineries operated by the entity.

+ References

No definition available.

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- Definition

Represents the number of smelting plants operated by the entity.

+ References

No definition available.

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- Definition

Number of underground poly metal mines which represent long-lived, depletable assets that represent the legal right to explore, extract and retain some or all portions of the benefits from mining.

+ References

No definition available.

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Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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CONCENTRATION OF RISK: (Details) $ in Millions	12 Months Ended
CONCENTRATION OF RISK: (Details) $ in Millions	Dec. 31, 2016 USD ($) item	Dec. 31, 2015	Dec. 31, 2014
Concentration of risk
Number of open-pit copper mines \| item	4
Number of underground poly metallic mines \| item	5
Number of smelters \| item	2
Number of refineries \| item	8
Cash equivalents
Concentration of risk
Total cash and short-term investment	$ 597.3
Percentage of total cash	100.00%
Percentage of cash in US dollars	97.00%
Cash equivalents \| United States
Concentration of risk
Total cash and short-term investment	$ 510.8
Percentage of total cash	85.50%
Percentage invested in one institution of country	33.90%
Percentage invested in one institution of total cash	29.00%
Cash equivalents \| Switzerland
Concentration of risk
Total cash and short-term investment	$ 51.4
Percentage of total cash	8.60%
Percentage invested in one institution of country	94.70%
Percentage invested in one institution of total cash	8.20%
Cash equivalents \| Peru
Concentration of risk
Total cash and short-term investment	$ 5.1
Percentage of total cash	0.90%
Percentage invested in one institution of country	34.70%
Percentage invested in one institution of total cash	0.30%
Cash equivalents \| Mexico
Concentration of risk
Total cash and short-term investment	$ 30.0
Percentage of total cash	5.00%
Percentage invested in one institution of country	94.40%
Percentage invested in one institution of total cash	4.70%
Accounts receivable trade \| Five largest customers
Concentration of risk
Percentage of accounts receivable and total sales	31.10%	32.40%	31.20%
Accounts receivable trade \| Largest customer
Concentration of risk
Percentage of accounts receivable and total sales	11.90%	10.90%	8.00%
Total sales \| Five largest customers
Concentration of risk
Percentage of accounts receivable and total sales	30.40%	28.00%	34.30%
Total sales \| Largest customer
Concentration of risk
Percentage of accounts receivable and total sales	8.40%	7.70%	8.20%