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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Details) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2013 segment | Dec. 31, 2012 | Dec. 31, 2011
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: |  |  |
Average estimated recovery period of long-term leach stockpiles | 5 years |  |
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) | 3.65 | 3.68 | 3.26
Average price of copper (in dollars per pound) | 3.00 |  |
Average price of molybdenum (in dollars per pound) | 10.00 |  |
Impairment in the carrying value of long-term assets | $ 0 |  |
Number of years of average prices for copper and molybdenum used for impairment analysis | 3 years |  |
Number of reportable segments | 3 |  |
Financial information related to segments |  |  |
Total property, net | 6,476,168,000 | 5,156,731,000 | 4,429,900,000
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 |  |
Minimum |  |  |
Financial information related to segments |  |  |
Estimated useful lives of buildings and equipment | 5 years |  |
Mine development |  |  |
Financial information related to segments |  |  |
Total property, net | 36,200,000 | 37,900,000 |
Mexican IMMSA Unit |  |  |
Financial information related to segments |  |  |
Number of underground poly metal mines | 5 |  |
Total property, net | 378,200,000 | 350,900,000 | 320,100,000
Peruvian Operations |  |  |
Financial information related to segments |  |  |
Number of open-pit copper mines | 2 |  |
Total property, net | $ 2,451,400,000 | $ 2,231,400,000 | $ 2,225,900,000

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