Represents the amount as of the balance sheet date of the estimated future tax effects attributable to the difference between the methods used to account for capitalized exploration expenses for tax purposes and under generally accepted accounting principles.

No definition available.

INCOME TAXES: (Details 3) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 AMC	Mar. 27, 2009 AMC	Dec. 31, 2011 Asarco
Assets:
Inventories	$ 23.2	$ 8.0
Trade receivables	18.1	2.3
Capitalized exploration expenses	31.9	22.9
U.S. foreign tax credit carryforward	174.4
U.S tax effect of Peruvian deferred tax liability	3.7	38.6
Capital loss carryforward		30.0
Metal hedging		82.5
Reserves	69.7	51.7
Mexican tax loss carryforward	35.7	37.5
Labor share buyback	30.1	30.0
Valuation allowance		(30.0)
Other	14.0	23.3
Total deferred tax assets	400.8	296.8
Liabilities:
Property, plant and equipment	(166.2)	(216.3)
Deferred charges	(35.3)	(25.0)
Mexican tax on consolidated dividends	(32.6)	(32.7)
Outside basis difference	(91.6)	(20.0)
Metal hedging	(4.0)
Other	(2.1)	(8.2)
Total deferred tax liabilities	(331.8)	(302.2)
Total net deferred tax assets / (liabilities)	$ 69.0	$ (5.4)
Related party transactions
Percentage of ownership interest held by the parent company			80.90%	80.00%	100.00%