XML 95 R34.htm IDEA: XBRL DOCUMENT
v2.4.0.6

SHORT-TERM INVESTMENTS: (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2012
SHORT-TERM INVESTMENTS: |
Schedule of short-term investments | Short-term investments were as follows ($ in millions):
|  | At December 31, |
|  | 2012 |  | 2011 |
Trading securities |  | $ | 127.8 |  | $ | 514.6 |
Weighted average interest rate |  | 1.87 | % | 1.37 | %
Available-for-sale |  | 6.5 |  | 7.3 |
Weighted average interest rate |  | 0.43 | % | 0.58 | %
Total |  | $ | 134.3 |  | $ | 521.9 |
Summary of activities in short-term investments | The following table summarizes the activity of these investments by category (in millions):
|  | Years ended December 31, |
|  | 2012 |  | 2011 |
Trading: |  |  |  |  |
Interest earned |  | $ | 3.1 |  | $ | 6.0 |
Unrealized gain (loss) at December 31, |  | $ | 2.4 |  | $ | (7.6 | )
Available-for-sale: |  |  |  |  |
Interest earned |  | $ | 0.1 |  | $ | 0.1 |
Investment redeemed |  | $ | 1.9 |  | $ | 2.1 |
Schedule of contractual maturities of the Company's available for sale debt securities | At December 31, 2012 and 2011, contractual maturities of the available-for-sale debt securities are as follows (in millions):
|  | 2012 |  | 2011 |
One year or less |  | $ | 0.4 |  | $ | 0.5 |
Maturing after one year through five years |  | — |  | — |
Maturing after five years through ten years |  | — |  | 0.6 |
Due after 10 years |  | 6.1 |  | 6.2 |
Total debt securities |  | $ | 6.5 |  | $ | 7.3 |

X
- Definition Tabular disclosure of activities in short-term investments during the period which includes the interest income earned during the period and proceeds from redemption of investments. + References No definition available. + Details
Name: | scco_ScheduleOfShortTermInvestmentActivitiesTableTextBlock
Namespace Prefix: | scco_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of short-term investments which includes the carrying amount as of the balance sheet date and weighted average interest rate. + References No definition available. + Details
Name: | scco_ScheduleOfShortTermInvestmentsTableTextBlock
Namespace Prefix: | scco_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
Name: | us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration