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PROPERTY: (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Property |  |  |
Total property | $ 8,406,700,000 | $ 7,880,000,000 |
Accumulated depreciation, amortization and depletion | (3,986,800,000) | (3,785,000,000) |
Total property, net | 4,419,885,000 | 4,094,993,000 | 3,969,600,000
Depreciation and depletion expense | 286,000,000 | 279,600,000 | 271,200,000
Buildings and equipment |  |  |
Property |  |  |
Total property | 6,871,100,000 | 6,703,800,000 |
Construction in progress |  |  |
Property |  |  |
Total property | 1,187,800,000 | 833,000,000 |
Mine development |  |  |
Property |  |  |
Total property | 301,400,000 | 301,300,000 |
Total property, net | 39,800,000 | 42,100,000 |
Land, other than mineral |  |  |
Property |  |  |
Total property | $ 46,400,000 | $ 41,900,000 |

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