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BUSINESS ACQUISITION (Tables) | 6 Months Ended
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Jun. 30, 2012
BUSINESS ACQUISITION |
Schedule of principal assumptions used in applying the Black-Scholes option pricing model |
|  | January 24, 2012 |
Risk-free interest rate |  | 0.02% to 0.39% |
Dividend yield |  | n/a |
Volatility factor of the expected market price of common stock |  | 46% to 77% |
Weighted-average expected life of option |  | 1.4 years |
Schedule of allocation of the purchase price |
|  | Fair Value |
Purchase price: |  |  |
Exchangeable shares of McEwen Mining Minera Andes Acquisition Corp. issued on acquisition |  | $ | 664,671 |
Stock options to be exchanged for options of McEwen Mining |  | 3,175 |
|  | $ | 667,846 |
Net assets acquired: |  |  |
Cash and cash equivalents |  | $ | 31,385 |
Short-term investments |  | 4,952 |
Other current assets |  | 9,828 |
Inventories |  | 1,362 |
Mineral property interests |  | 597,374 |
Investment in Minera Santa Cruz S.A. |  | 224,999 |
Equipment |  | 1,647 |
Accounts payable |  | (5,323 | )
Deferred income tax liability |  | (198,378 | )
|  | $ | 667,846 |
Schedule of pro forma results for the entity, had the acquisition been completed within the period |
Six months ended June 30, 2012 |  | McEwen Mining |  | Minera Andes (a) |  | Combined |
Revenue |  | $ | 990 |  | $ | 4,979 |  | $ | 5,969 |
Net (loss) income for the period |  | (40,453 | ) | 3,498 |  | (36,955 | )
Six months ended June 30, 2011 |  | McEwen Mining |  | Minera Andes |  | Combined |
Revenue |  | $ | — |  | $ | 25,716 |  | $ | 25,716 |
Net (loss) income for the period |  | (21,888 | ) | 18,706 |  | (3,182 | )
(a) Six months ended June 30, 2012 represents the results of Minera Andes’ operations from January 1, 2012 through January 24, 2012, closing date of the acquisition. Beginning January 25, 2012, the results of Minera Andes’ operations are included in McEwen Mining’s consolidated financial statements.

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- Definition Tabular disclosure of the significant assumptions used to estimate the fair value of stock options in case of business acquisition, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + Details
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- Definition Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 54 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 55 -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 141R -Paragraph 68 -Subparagraph r(2, 3) -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. + Details
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- Definition Tabular disclosure of all of the fair values of the purchase price and assets and liabilities acquired in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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