XML 68 R21.htm IDEA: XBRL DOCUMENT
v2.4.0.8

SHORT-TERM INVESTMENTS: (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2013
SHORT-TERM INVESTMENTS: |
Schedule of short-term investments | Short-term investments were as follows ($ in millions):
|  | At September 30, 2013 |  | At December 31, 2012 |
Trading securities |  | $ | 357.4 |  | $ | 127.8 |
Weighted average interest rate |  | 2.18 | % | 1.87 | %
Available-for-sale |  | $ | 6.1 |  | $ | 6.5 |
Weighted average interest rate |  | 0.42 | % | 0.43 | %
Total |  | $ | 363.5 |  | $ | 134.3 |
Summary of activities in short-term investments | The following table summarizes the activity of these investments by category (in millions):
|  | Three months ended |  | Nine months ended |
|  | September 30, |  | September 30, |
|  | 2013 |  | 2012 |  | 2013 |  | 2012 |
Trading securities: |  |  |  |  |  |  |  |  |
Interest earned |  | $ | 1.9 |  | $ | 0.9 |  | $ | 3.9 |  | $ | 2.5 |
Unrealized gain (loss) |  | (3.3 | ) | 3.7 |  | (2.3 | ) | 8.8 |
Available-for-sale: |  |  |  |  |  |  |  |  |
Interest earned |  | (* | ) | (* | ) | (* | ) | (* | )
Investment redeemed |  | $ | — |  | $ | 0.2 |  | $ | 0.4 |  | $ | 1.4 |
(*) Less than $0.1 million

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