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INCOME TAXES: (Details 3) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
AMC
Mar. 27, 2009
AMC
Dec. 31, 2012
Asarco
Assets:          
Inventories $ 23.6 $ 23.2      
Trade receivables   18.1      
Capitalized exploration expenses 24.4 31.9      
U.S. foreign tax credit carryforward 202.3 174.4      
U.S tax effect of Peruvian deferred tax liability 33.4 3.7      
Reserves 77.5 69.7      
Mexican tax loss carryforward 26.9 35.7      
Labor share buyback 30.0 30.1      
Other 32.6 14.0      
Total deferred tax assets 450.7 400.8      
Liabilities:          
Property, plant and equipment (125.0) (166.2)      
Deferred charges (81.6) (35.3)      
Mexican tax on consolidated dividends (34.6) (32.6)      
Outside basis difference (41.3) (91.6)      
Metal hedging   (4.0)      
Other (0.5) (2.1)      
Total deferred tax liabilities (283.0) (331.8)      
Total net deferred tax assets / (liabilities) 167.7 69.0      
Amount of capital loss carryover which was utilized 0.9        
Amount of capital loss carryover which was expired $ 1.3 $ 27.8      
Related party transactions          
Percentage of ownership interest held by the parent company 81.30% 80.90% 81.30% 80.00% 100.00%