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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%

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- Definition The amount as of the balance sheet date of the estimated future tax effects attributable to the difference between the tax basis of capital assets and the basis of capital assets computed in accordance with generally accepted accounting principles. The difference in basis, attributable to different capitalization of costs, depreciation, or amortization methodologies, will increase future taxable income when such basis difference is realized. Capital assets include but are not limited to assets such as land, real estate, leasehold improvements, machinery and equipment and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6969291&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 11 -Subparagraph d, e, f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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