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Deferred Income and Mining Tax Liabilities and Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred income and mining tax liabilities |  |
Property, plant and equipment | $ 669.8 | $ 865.6
Investments held by environmental trust funds | 2.1 | 2.7
Inventory | 17.9 | 22.7
Other | 13.8 | 18.1
Gross deferred income and mining tax liabilities | 703.6 | 909.1
Provisions, including rehabilitation accruals | (109.9) | (118.8)
Tax losses | (187.8) | (211.1)
Unredeemed capital expenditure | (657.0) | (762.2)
Other | (2.3) | (7.1)
Gross deferred income and mining tax assets | (957.0) | (1,099.2)
Valuation allowance for deferred tax assets | 505.7 | 435.5
Total deferred income and mining tax assets | (451.3) | (663.7)
Net deferred income and mining tax liabilities | 252.3 | 245.4
Long-term liabilities | (254.1) | (263.2)
Long-term assets | 1.8 | 17.8
Net deferred income and mining tax liabilities | $ (252.3) | $ (245.4)

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