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Additional Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2012
Interest Paid Included in Net Cash Provided by Operating Activities |
|  |  |  | Fiscal year Ended December 31, |  |  | Six Months Ended December 31, |  |  | Fiscal Year Ended June 30, |
|  |  |  | 2012 |  |  | 2011 |  |  | 2010 |  |  | 2010 |
(a) |  | Supplementalcash flow disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | The income and mining taxes paid in the statement of cash flow represents actual cash paid. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | The following amounts of interest paid were included in cash flows from operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Interest paid before capitalization |  |  | 83.1 |  |  |  | 63.6 |  |  |  | 36.4 |  |  |  | 71.7 |
(b) |  | Non cash-items |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Marked to market gain/(loss) of listed investments |  |  | 18.7 |  |  |  | (26.4 | ) |  |  | 28.8 |  |  |  | 24.9 |

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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
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