McEwen Mining (MUX) 10-Q 7 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Nov. 04, 2013
Document and Entity Information	'	'
Entity Registrant Name	'McEwen Mining Inc.	'
Entity Central Index Key	'0000314203	'
Document Type	'10-Q	'
Document Period End Date	30-Sep-13	'
Amendment Flag	'false	'
Current Fiscal Year End Date	'--12-31	'
Entity Current Reporting Status	'Yes	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	264,295,775
Exchangeable Common Stock, Shares Outstanding	'	32,863,584
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'

CONSOLIDATED_STATEMENTS_OF_OPE

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
REVENUE:	'	'	'	'
Gold and silver sales	$11,778	$456	$35,735	$456
Income on investment in Minera Santa Cruz S.A., net of amortization (note 6)	2,040	11,240	252	14,968
Total Revenue	13,818	11,696	35,987	15,424
COSTS AND EXPENSES:	'	'	'	'
Production costs applicable to sales	7,907	119	26,778	119
Mine operating costs	'	2,406	'	8,622
Mine construction costs	'	4,671	'	13,306
Mine development costs	747	'	1,316	'
Exploration costs	2,575	6,708	22,064	28,565
Property holding costs	2,384	2,147	4,077	4,127
General and administrative	2,496	4,119	10,905	12,935
Acquisition costs	'	8	'	1,450
Accretion of asset retirement obligation (note 5)	113	110	347	342
Depreciation	204	266	731	750
Impairment of investment in Minera Santa Cruz S.A. (note 6)	'	'	95,878	'
Impairment of mineral property interests and property and equipment (note 5)	6,287	2,902	34,016	3,081
(Gain) loss on sale of assets (note 5)	-50	-1,135	6,741	-1,265
Total costs and expenses	22,663	22,321	202,853	72,032
Operating loss	-8,845	-10,625	-166,866	-56,608
OTHER INCOME (EXPENSE):	'	'	'	'
Interest income	60	16	199	198
Gain on litigation settlement (notes 7 and 12)	'	'	560	'
Loss on sale of marketable equity securities	'	-70	'	-70
Gain (loss) on sale of gold and silver bullion (note 4)	51	1,233	-223	3,075
Unrealized loss on gold and silver bullion (note 4)	'	'	'	-359
Other-than-temporary impairment on marketable equity securities	'	'	'	-1,993
Foreign currency (loss) gain	-159	423	-1,094	469
Total other income (expense)	-48	1,602	-558	1,320
Loss before income taxes	-8,893	-9,023	-167,424	-55,288
Recovery of income taxes	12,157	6,369	31,025	14,919
Net income (loss)	3,264	-2,654	-136,399	-40,369
OTHER COMPREHENSIVE INCOME (LOSS):	'	'	'	'
Reclassification of unrealized gain on marketable securities disposed of during the period, net of taxes	'	'	'	1,000
Unrealized (loss) gain on available-for-sale securities, net of taxes	'	-1	3	-2
Comprehensive income (loss)	$3,264	($2,655)	($136,396)	($39,371)
Net income (loss) per share (note 9):	'	'	'	'
Basic (in dollars per share)	$0.01	($0.01)	($0.46)	($0.16)
Diluted (in dollars per share)	$0.01	($0.01)	($0.46)	($0.16)
Weighted average common shares outstanding (thousands) (note 9):	'	'	'	'
Basic (in shares)	297,125	268,373	297,001	256,834
Diluted (in shares)	297,899	268,373	297,001	256,834

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$31,062	$70,921
Investment in gold and silver bullion (market value - 2013 - nil; 2012 - $2,062) (note 4)	'	1,690
IVA taxes receivable	10,129	9,150
Inventories (note 3)	7,807	7,262
Other current assets	1,922	2,895
Total current assets	50,920	91,918
Mineral property interests (note 5)	724,841	767,067
Restrictive time deposits for reclamation bonding (note 5)	5,183	5,183
Investment in Minera Santa Cruz S.A. (note 6)	177,080	273,948
Property and equipment, net	15,143	12,767
Other assets	84	54
TOTAL ASSETS	973,251	1,150,937
Current liabilities:	'	'
Accounts payable and accrued liabilities	10,041	21,235
Litigation settlement liability (notes 7 and 12)	'	3,830
Current portion of asset retirement obligation (note 5)	1,351	130
Total current liabilities	11,392	25,195
Asset retirement obligation, less current portion (note 5)	5,265	6,229
Deferred income tax liability (notes 2 and 5)	198,497	229,522
Other liabilities	400	400
Total liabilities	215,554	261,346
Shareholders' equity:	'	'
Common stock, no par value, 500,000 shares authorized; Common: 263,626 shares as of September 30, 2013 and 212,646 shares as of December 31, 2012 issued and outstanding exchangeable: 33,533 shares as of September 30, 2013 and 83,379 shares as of December 31, 2012 issued and outstanding	1,354,279	1,349,777
Accumulated deficit	-596,291	-459,892
Accumulated other comprehensive loss	-291	-294
Total shareholders' equity	757,697	889,591
TOTAL LIABILITIES & SHAREHOLDERS' EQUITY	$973,251	$1,150,937

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Gold and silver bullion, market value (in dollars)	'	$2,062
Common stock, par value	'	'
Common stock, shares authorized	500,000	500,000
Common, shares issued	263,626	212,646
Common, shares outstanding	263,626	212,646
Exchangeable, shares issued	33,533	83,379
Exchangeable, shares outstanding	33,533	83,379

CONSOLIDATED_STATEMENTS_OF_CHA

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $)	Total	Common Stock	Accumulated Other Comprehensive (Loss) Income	Accumulated Deficit
In Thousands, except Share data, unless otherwise specified
Balance at Dec. 31, 2011	$219,304	$613,831	($1,289)	($393,238)
Balance (in shares) at Dec. 31, 2011	'	139,753,000	'	'
Increase (Decrease) in Shareholders' Equity	'	'	'	'
Stock-based compensation	2,845	2,845	'	'
Issuance of exchangeable shares to acquire Minera Andes Inc.	664,671	664,671	'	'
Issuance of exchangeable shares to acquire Minera Andes Inc. (in shares)	'	127,331,000	'	'
Assumption of stock options in connection with the acquisition of Minera Andes Inc.	3,175	3,175	'	'
Exercise of stock options	721	721	'	'
Exercise of stock options (in shares)	'	387,000	'	'
Exercise of stock options assumed from Minera Andes Inc. acquisition	2,844	2,844	'	'
Exercise of stock options assumed from Minera Andes Inc. acquisition (in shares)	'	942,000	'	'
Shares issued for Mexico mining concessions	391	391	'	'
Shares issued for Mexico mining concessions (in shares)	'	83,000	'	'
Unrealized (loss) gain on available-for-sale securities, net of taxes	-2	'	-2	'
Reclassification of unrealized loss on marketable equity securities disposed of during the period, net of tax	-993	'	-993	'
Other-than-temporary impairment on marketable equity securities	1,993	'	1,993	'
Net loss (adjusted - note 6)	-40,369	'	'	-40,369
Balance at Sep. 30, 2012	854,580	1,288,478	-291	-433,607
Balance (in shares) at Sep. 30, 2012	'	268,496,000	'	'
Balance at Dec. 31, 2012	889,591	1,349,777	-294	-459,892
Balance (in shares) at Dec. 31, 2012	'	296,025,000	'	'
Increase (Decrease) in Shareholders' Equity	'	'	'	'
Stock-based compensation	965	965	'	'
Exercise of stock options	95	95	'	'
Exercise of stock options (in shares)	48,000	48,000	'	'
Exercise of stock options assumed from Minera Andes Inc. acquisition	76	76	'	'
Exercise of stock options assumed from Minera Andes Inc. acquisition (in shares)	'	45,000	'	'
Shares issued for litigation settlement	3,270	3,270	'	'
Shares issued for litigation settlement (in shares)	'	1,000,000	'	'
Shares issued for Mexico mining concessions	96	96	'	'
Shares issued for Mexico mining concessions (in shares)	41,500	41,000	'	'
Unrealized (loss) gain on available-for-sale securities, net of taxes	3	'	3	'
Net loss (adjusted - note 6)	-136,399	'	'	-136,399
Balance at Sep. 30, 2013	$757,697	$1,354,279	($291)	($596,291)
Balance (in shares) at Sep. 30, 2013	'	297,159,000	'	'

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Cash flows (used in) from operating activities:	'	'
Cash paid to suppliers and employees	($74,359)	($65,760)
Cash received from gold and silver sales	34,711	'
Proceeds from sale of gold and silver bullion	1,467	23,836
Dividend received from Minera Santa Cruz S.A.	1,242	2,154
Interest received	139	125
Cash used in operating activities	-36,800	-39,645
Cash flows (used in) provided by investing activities:	'	'
Cash and short-term investments received from acquisition of Minera Andes Inc.	'	36,337
Short-term investments (net)	'	3,933
Acquisition of mineral property interests	-150	-712
Additions to property and equipment	-3,710	-1,769
Proceeds from disposal of mineral property interests and property and equipment	1,449	3,143
Proceeds from sale of marketable securities	'	409
Cash provided by investing activities	-2,411	41,341
Cash flows from financing activities:	'	'
Exercise of stock options	171	3,564
Cash provided by financing activities	171	3,564
Effect of exchange rate change on cash and cash equivalents	-819	-156
(Decrease) increase in cash and cash equivalents	-39,859	5,104
Cash and cash equivalents, beginning of period	70,921	13,416
Cash and cash equivalents, end of period	31,062	18,520
Reconciliation of net loss to cash used in operating activities:	'	'
Net loss	-136,399	-40,369
Adjustments to reconcile net loss from operating activities:	'	'
Impairment of investment in Minera Santa Cruz S.A.	95,878	'
Impairment of mineral property interests and property and equipment	34,016	3,081
Loss (gain) on sale of assets	6,741	-1,265
Loss on sale of marketable securities	'	70
Income on investment in Minera Santa Cruz S.A., net of amortization	-252	-14,968
Recovery of income taxes	-31,025	-14,919
Gain on litigation settlement	-560	'
Loss (gain) on sale of gold and silver bullion	223	-3,075
Proceeds on sale of gold and silver bullion	1,467	23,836
Unrealized loss on silver bullion	'	359
Other-than-temporary impairment on marketable equity securities	'	1,993
Stock-based compensation	965	2,845
Accretion of asset retirement obligation	347	342
Depreciation	731	750
Amortization of mineral property interests and asset retirement obligations	1,244	'
Foreign exchange loss	819	156
Change in non-cash working capital items:	'	'
Increase in other assets related to operations	1,143	-6,680
Dividend receivable obtained from acquisition of Minera Andes Inc.	'	9,363
Dividend receivable from Minera Santa Cruz S.A	'	2,611
Decrease in liabilities related to operations	-12,138	-3,775
Cash used in operating activities	($36,800)	($39,645)

NATURE_OF_OPERATIONS_AND_SUMMA

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	9 Months Ended
	Sep. 30, 2013
NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	'
NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	'
	NOTE 1  NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Nature of Operations and Basis of Presentation
	McEwen Mining Inc. (the “Company” or “McEwen Mining”) was organized under the laws of the State of Colorado on July 24, 1979.  Since inception, the Company has been engaged in the exploration for, development of, production and sale of gold and silver. On January 24, 2012, the Company changed its name from US Gold Corporation to McEwen Mining Inc. after the completion of the acquisition of Minera Andes Inc. (“Minera Andes”) by way of a statutory plan of arrangement under the laws of the Province of Alberta, Canada.
	The Company operates in Argentina, Mexico, and the United States.  It owns a 49% interest in Minera Santa Cruz S.A. (“MSC”), owner of the producing San José silver-gold mine in Santa Cruz, Argentina, which is operated by the majority owner of the joint venture, Hochschild Mining plc (‘‘Hochschild’’). It also owns the El Gallo 1 mine in Sinaloa, Mexico, where production began in September 2012, with a total of 30,319 gold equivalent ounces produced between commencement of production and September 30, 2013. Finally, the Company also own the Los Azules Copper Deposit in San Juan, Argentina, development projects including the El Gallo 2 project in Mexico and the Gold Bar project in Nevada, USA, and a large portfolio of exploration properties in Argentina, Nevada and Mexico.
	The interim consolidated financial statements included herein have been prepared by the Company, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”).  Certain information and note disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) has been condensed or omitted pursuant to such rules and regulations, although the Company believes that the disclosures included are adequate to make the information presented not misleading.
	In management’s opinion, the unaudited consolidated statements of operations and comprehensive income (loss) for the three and nine months ended September 30, 2013 and 2012, the consolidated balance sheets as at September 30, 2013 (unaudited) and December 31, 2012, the unaudited consolidated statement of changes in shareholders’ equity for the nine months ended September 30, 2013  and 2012, and the unaudited consolidated statements of cash flows for the nine months ended September 30, 2013 and 2012, contained herein, reflect all adjustments, consisting solely of normal recurring items, which are necessary for the fair presentation of the Company’s financial position, results of operations and cash flows on a basis consistent with that of the Company’s prior audited consolidated financial statements.  However, the results of operations for the interim periods may not be indicative of results to be expected for the full fiscal year.  Therefore these financial statements should be read in conjunction with the audited financial statements and notes thereto and summary of significant accounting policies included in the Company’s Form 10-K for the year ended December 31, 2012.  Except as noted below, there have been no material changes in the footnotes from those accompanying the audited consolidated financial statements contained in the Company’s Form 10-K for the year ended December 31, 2012.
	The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries.  All inter-company accounts and transactions have been eliminated.
	Recently Adopted Accounting Pronouncements
	Comprehensive Income:  In February 2013, the FASB issued ASU No. 2013-02, Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income.  The updated guidance requires expanded disclosures for amounts reclassified out of accumulated other comprehensive income by component. The guidance requires the presentation of amounts reclassified out of accumulated other comprehensive income by the respective line items of net income but only if the amount reclassified is required under GAAP to be reclassified to net income in its entirety in the same reporting period.  For other amounts that are not required under GAAP to be reclassified in their entirety to net income, a cross-reference to other disclosures that provide additional detail about those amounts is required.  The guidance is to be applied prospectively for reporting periods beginning after December 15, 2012. The update is effective for the Company’s fiscal year beginning January 1, 2013.  The new guidance affects disclosures only and the adoption had no impact on the Company’s consolidated financial position, results of operations or cash flows.

BUSINESS_ACQUISITION

BUSINESS ACQUISITION	9 Months Ended
	Sep. 30, 2013
BUSINESS ACQUISITION	'
BUSINESS ACQUISITION	'
	NOTE 2   BUSINESS ACQUISITION
	On January 24, 2012, the Company completed the acquisition of Minera Andes (“the Arrangement”) through a court-approved plan of arrangement under Alberta, Canada law pursuant to which Minera Andes, an Alberta (Canada) company, became an indirect wholly-owned subsidiary of the Company.
	On the closing date of the Arrangement, holders of Minera Andes’ common stock received a number of exchangeable shares of McEwen Mining - Minera Andes Acquisition Corporation, an indirect wholly-owned Canadian subsidiary of the Company, equal to the number of Minera Andes shares owned by the holder, multiplied by the exchange ratio of 0.45.  The 127,331,498 exchangeable shares issued are exchangeable for the Company’s common stock on a one-for-one basis.
	The acquisition has been accounted for using the acquisition method in accordance with ASC Topic 805, Business Combinations, with the Company being identified as the acquirer.  The measurement of the purchase consideration was based on the market price of the Company’s common stock on January 24, 2012, which was $5.22 per share.  The total purchase price, including the fair value of the options, amounted to $667.8 million.
	The fair value of mineral property interests exceeded the carrying value of the underlying assets for tax purposes by approximately $508.5 million.  The resulting estimated deferred income tax liability originally associated with this temporary difference was approximately $178.0 million, which was included in the allocation of the purchase price above.  At the end of 2012, the Company reduced the deferred income tax liability from $178.0 million to $156.9 million, as a result of further fluctuations in the foreign exchange rates between the Argentine pesos and U.S. dollar from January 24, 2012 to December 31, 2012.  For the nine months ended September 30, 2013, the Company recorded an additional income tax recovery of $23.6 million as a result of the fluctuations in foreign exchange rates since December 31, 2012. Furthermore, in the second quarter of 2013, the Company also recorded an impairment of $27.7 million on certain of its Santa Cruz mineral property interests, as discussed in Note 5, along with an associated $2.3 million of income tax recovery. These resulted in a deferred income tax liability on these assets of $131.0 million, which is included in the deferred income tax liability balance of $198.5 million on the unaudited consolidated balance sheet as at September 30, 2013.

INVENTORIES

INVENTORIES	9 Months Ended
	Sep. 30, 2013
INVENTORIES	'
INVENTORIES	'
	NOTE 3   INVENTORIES
	Inventories at September 30, 2013 and December 31, 2012 consist of the following (in thousands):
		As at September 30, 2013		As at December 31, 2012
	Ore on leach pads	$	2,795	$	685
	In-process inventory	1,572		3,604
	Stockpiles	462		308
	Precious metals	1,501		1,322
	Materials and supplies	1,477		1,343
	Inventories	$	7,807	$	7,262

GOLD_AND_SILVER_BULLION

GOLD AND SILVER BULLION	9 Months Ended
	Sep. 30, 2013
GOLD AND SILVER BULLION	'
GOLD AND SILVER BULLION	'
	NOTE 4   GOLD AND SILVER BULLION
	From time to time, the Company invests a portion of its cash in physical gold and silver bullion. Below is the balance of its holdings of gold and silver as at September 30, 2013 and December 31, 2012:
		As at September 30, 2013						As at December 31, 2012
		Gold			Silver			Gold			Silver
		(dollars in thousands, except ounces and per ounce)
	Number of ounces	—			—			793			24,969
	Average cost per ounce	n/a			n/a			$	1,278.63		$	27.08
	Total cost	$	—		$	—		$	1,014		$	676
	Fair value per ounce	n/a			n/a			$	1,657.50		$	29.95
	Total fair value	$	—		$	—		$	1,314		$	748
	The fair value of gold and silver was based on the daily London P.M. fix as at the reporting date. Since ASC Topic 815, Derivatives and Hedging, does not consider gold and silver to be readily convertible to cash, the Company carries these assets at the lower of cost or market.
	During the nine months ended September 30, 2013, the Company recorded a realized loss of $0.2 million on its gold and silver bullion, as a result of its average cost of $1,278.63 and $27.08 per ounce, respectively, being lower than its selling price of $1,245.70 per ounce of gold and $19.18 per ounce of silver in the third quarter of 2013.
	Changes in the Company’s holdings of gold and silver for the nine months ended September 30, 2013 and year ended December 31, 2012 are as follows:
		Nine months ended September 30, 2013									Year ended December 31, 2012
		Gold			Silver			Total			Gold			Silver			Total
		(in thousands)
	Opening Balance	$	1,014		$	676		$	1,690		$	7,232		$	15,578		$	22,810
	Proceeds from sale	(988		)	(479		)	(1,467		)	(7,982		)	(15,854		)	(23,836		)
	(Loss) gain on sale	(26		)	(197		)	(223		)	1,764			1,311			3,075
	Unrealized loss	—			—			—			—			(359		)	(359		)
	Ending Balance	$	—		$	—		$	—		$	1,014		$	676		$	1,690

MINERAL_PROPERTY_INTERESTS_AND

MINERAL PROPERTY INTERESTS AND ASSET RETIREMENT OBLIGATIONS	9 Months Ended
	Sep. 30, 2013
MINERAL PROPERTY INTERESTS AND ASSET RETIREMENT OBLIGATIONS	'
MINERAL PROPERTY INTERESTS AND ASSET RETIREMENT OBLIGATIONS	'
	NOTE 5   MINERAL PROPERTY INTERESTS AND ASSET RETIREMENT OBLIGATIONS
	Mineral Property Interests
	At September 30, 2013, the Company held mineral rights in Argentina, mineral concession rights in Mexico, including the El Gallo Complex, and mineral interests in Nevada.  The El Gallo 1 mine recommenced gold and silver production in September 2012. For accounting purposes, the mine achieved commercial production in September 2012.  For operational purposes, commercial production was effective as of January 1, 2013.  For the year ended December 31, 2012, a total of 6,949 gold equivalent ounces were produced at El Gallo. For the three and nine months ended September 30, 2013, a total of 8,027 and 23,370 gold equivalent ounces were produced at El Gallo, respectively.
	In May 2013, the Company entered into a sale agreement for certain mining claims in the Limo Complex, Nevada, for a sale price of $0.8 million. The claims had a carrying value of $7.2 million. As the carrying value exceeded the proceeds from the sales agreement, the Company recorded a loss on disposal of $6.4 million, along with a resulting reduction in deferred tax liability and recovery of deferred income taxes of $2.5 million. This resulted in a net loss on disposal of $3.9 million which is included in the net loss for the nine months ended September 30, 2013. The Limo Complex is part of the “Nevada” segment, as shown in Note 11.
	During the second quarter of 2013, the Province of Santa Cruz, Argentina, passed amendments to the Provincial Tax Code and Provincial Tax Law, which imposes a new tax on mining real estate property in the Province. The tax will amount to 1% of the value of the economically viable reserves of mining projects, less certain deductions. Based on this development, along with a significant decline in gold and silver market prices during the year and continued inflationary pressures resulting in a depressed market for exploration companies in Argentina, the Company concluded that there were indicators that the carrying value of the mineral property interests in the Santa Cruz Province may not be recoverable. The Company engaged a third party valuator to test the recoverability and determine the fair value of these properties. The valuator used a market approach to estimate the fair value of the properties by using the observed market value per acre in the region. As a result, the Company recorded an impairment of $27.7 million in the second quarter of 2013, along with a resulting reduction in deferred tax liability and recovery of future income taxes of $2.3 million, for a net impairment charge of $25.4 million for the nine months ended September 30, 2013. The Santa Cruz Province mineral property interests are part of the “Argentina” segment, as shown in Note 11.
	During the third quarter of 2013, the Company rationalized its mineral property interests in Nevada in order to focus its exploration program on more prospective areas. As a result, the Company allowed certain claims from one of its Nevada properties in the West Battle Mountain Complex to lapse. These mineral property interests in question were acquired in 2007 and had a carrying value of $6.3 million, which was written off during the third quarter of 2013, along with a resulting reduction in deferred tax liability and recovery of future income taxes of $2.2 million. This resulted in a net write-off for the Company of $4.1 million which is included in the net income (loss) for the three and nine months ended September 30, 2013. The West Battle Mountain Complex is part of the “Nevada” segment, as shown in Note 11.
	Based on the above, impairment charges were recorded on the following mineral property interests for the three and nine months ended September 30, 2013:
				Three Months Ended					Nine Months Ended
				September 30,					September 30,
	Name of Property/Complex	Segment		2013			2012		2013		2012
	Telken Tenements	Argentina		$	—		$	—	$	13,792	$	—
	Este Tenements	Argentina		—			—		2,784		—
	Piramides Tenements	Argentina		—			—		5,079		—
	Tobias Tenements	Argentina		—			—		6,074		—
	West Battle Mountain Complex	Nevada		6,287			—		6,287		—
	Other United States Properties	Nevada		—			2,902		—		2,902
	Property, plant and equipment	Argentina		—			—		—		179
	Total impairment			$	6,287		$	2,902	$	34,016	$	3,081
	In October 2013, the Company and Hochschild entered into a vend-in agreement with MSC pursuant to which the Company and Hochschild agreed to contribute to MSC the mining rights of certain of Santa Cruz exploration properties. Refer to Note 6, Investment in Minera Santa Cruz S.A. (“MSC”) — San José Mine, for details.
	Asset Retirement Obligation
	The Company is responsible for reclamation of certain past and future disturbances at its properties.  The two most significant properties subject to these obligations are the historic Tonkin property in Nevada and the El Gallo 1 mine in Mexico.  Reclamation expenditures are expected to be incurred between 2013 and 2040.
	Changes in the Company’s asset retirement obligations for the nine months ended September 30, 2013 and year ended December 31, 2012 are as follows (in thousands):
		Nine Months Ended			Year Ended
		September 30, 2013			December 31, 2012
	Asset retirement obligation liability - opening balance	$	6,359		$	6,253
	Settlements	(56		)	(47		)
	Accretion of liability	342			447
	Adjustment reflecting updated estimates	(29		)	(294		)
	Asset retirement obligation liability - ending balance	$	6,616		$	6,359
	As at September 30, 2013, the current portion of the asset retirement obligation was $1.4 million (December 31, 2012 - $0.1 million).
	The current undiscounted estimate of the reclamation costs for existing disturbances on the Tonkin property as required by the U.S. Bureau of Land Management (“BLM”) and the Nevada Department of Environmental Protection (“NDEP”) is $3.8 million.  The Company submitted a mine closure plan to the NDEP and BLM for the Tonkin property during the fourth quarter of 2010.  Based on the Company’s estimate, the change in its bonding requirements was insignificant.  As at September 30, 2013, the closure plan has already been approved by the NDEP but is still under review by the BLM.  It is possible that reclamation plan cost estimates and bonding requirements may increase as a result of its review.  The Company, however, is unable to meaningfully estimate possible increases at this time. For mineral properties in the United States, the Company maintains required reclamation bonding with various governmental agencies, and at September 30, 2013 and December 31, 2012, had cash bonding in place of $5.2 million.
	The costs of undiscounted projected reclamation of El Gallo 1 are currently estimated at $4.6 million. Under Mexican regulations, surety bonding of projected reclamation costs is not required.
	When proven and probable reserves exist at the Company’s properties, the relevant capitalized asset retirement costs and mineral property interests are to be charged to expense based on the units of production method and upon commencement of production. As previously discussed, El Gallo 1 began production in September 2012.  However, since El Gallo 1 does not contain mineralized material that satisfies the definition of proven and probable reserves under the SEC Industry Guide 7, the amortization of the capitalized asset retirement costs and mineral property interests are charged to expense based on the straight-line method over the estimated useful life of the mine. For the three and nine months ended September 30, 2013, the Company recorded $0.3 million and $1.2 million of amortization expense related to El Gallo 1, respectively, which was reported in production cost applicable to sales on the unaudited statement of operations and comprehensive income (loss).

INVESTMENT_IN_MINERA_SANTA_CRU

INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE	9 Months Ended
	Sep. 30, 2013
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE	'
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE	'
	NOTE 6   INVESTMENT IN MINERA SANTA CRUZ S.A. (“MSC”) — SAN JOSÉ MINE
	As discussed in Note 1, the Company acquired a 49% interest in MSC, owner and operator of the San José Silver-Gold Mine in Santa Cruz, Argentina, in January 2012. The Company’s share of earnings and losses from its investment in MSC is included in the consolidated statement of operations and comprehensive income (loss), and amounted to $3.9 million for the nine months ended September 30, 2013, or 49% of MSC’s reported net income of $8.0 million. For the nine months ended September 30, 2012, MSC reported to the Company only its net income from January 25, 2012 to September 30, 2012 since the acquisition closed on January 24, 2012.
	As at September 30, 2012, the investment in MSC was allocated an estimated fair value of $261.2 million.  During the fourth quarter of 2012, the purchase price allocation was finalized and the estimated fair value of the investment in MSC was increased to $262.9 million.  The adjustment affected the composition of the fair value allocation to MSC’s assets, resulting in a reduction in the amortization previously reported for the third quarter of 2012.  Below is a reconciliation of the adjustment for the third quarter of 2012.
		For three months ended			For nine months ended
		September 30, 2012			September 30, 2012
		(in thousands)
	Amortization of fair value increments, as reported	$	1,597		$	3,746
	Adjustment	71			(209		)
	Amortization of fair value increments, as adjusted	$	1,668		$	3,537
	Net loss, as reported	$	(2,583	)	$	(40,578	)
	Adjustment	(71		)	209
	Net loss, as adjusted	$	(2,654	)	$	(40,369	)
	During the first quarter of 2013, it was determined that the cost of sales reported by MSC under U.S. GAAP for the year and quarter ended December 31, 2012 was understated, resulting in an overstatement of MSC’s after-tax net income of $3.9 million. As a result, the prior year income from the Company’s equity investment of 49% in MSC was overstated by $1.9 million. As the error is not material to the current or previously reported consolidated financial statements, the correction was recorded in the quarter ended March 31, 2013.
	During the second quarter of 2013, the Province of Santa Cruz passed amendments to the Provincial Tax Code and Provincial Tax Law, which imposes a new tax on mining real estate property in the Province. The tax will amount to 1% of the value of the economically viable reserves of mining projects, less certain deductions, and MSC has estimated that this would result in a tax payable amount ranging between $2.0 million and $3.0 million for the year 2013. Based on this development, along with a significant decline in gold and silver market prices and continued inflationary pressures, the Company concluded that there were indicators that there was a loss in value in its investment in MSC that was other than temporary.  The Company engaged a third party valuator to test the recoverability and determine the fair value of its investment in MSC. The valuator used a discounted cash flow approach and determined that the carrying value of the Company’s investment in MSC exceeded its estimated fair value. As the loss in value of the investment was considered other than temporary, an impairment of $95.9 million was recorded in the second quarter of 2013. The investment in MSC is part of the “Argentina” segment as shown in Note 11.
	Changes in the Company’s investment in MSC for the nine months ended September 30, 2013 and year ended December 31, 2012 are as follows:
		Nine Months Ended			Year Ended
		September 30, 2013			December 31, 2012
		(in thousands)
	Investment in MSC, beginning of period	$	273,948		$	—
	Fair value of investment in MSC from acquisition of Minera Andes	—			262,883
	Income from equity investment	3,914			25,301
	Amortization of fair value increments	(3,662		)	(4,466		)
	Dividend distribution	(1,242		)	(9,770		)
	Impairment of investment in MSC	(95,878		)	—
	Investment in MSC, end of period	$	177,080		$	273,948
	A summary of the operating results from MSC for the three and nine months ended September 30, 2013 and the period from January 25, 2012 (after the closing of the acquisition of Minera Andes) to September 30, 2012 is as follows:
		Three Months Ended			Three Months Ended			Nine Months Ended			Period ended
		September 30, 2013			September 30, 2012			September 30, 2013			September 30, 2012
		(in thousands)
	Sales - MSC 100%	$	69,662		$	116,299		$	182,031		$	212,902
	Net income - MSC 100%	5,424			26,343			7,988			37,765
	McEwen Mining’s portion - 49%	2,658			12,908			3,914			18,505
	Net income on investment in MSC	$	2,658		$	12,908		$	3,914		$	18,505
	Amortization of fair value increments	(618		)	(1,668		)	(3,662		)	(3,537		)
	Income on investment in MSC, net of amortization	$	2,040		$	11,240		$	252		$	14,968
	As at September 30, 2013, MSC had current assets of $120.2 million, total assets of $522.4 million, current liabilities of $56.4 million and total liabilities of $166.8 million on an unaudited basis. These balances include the increase in fair value and amortization of the fair value increments arising from the purchase price allocation and the impairment charge of $95.9 million recorded in the second quarter of 2013.
	In October 2013, the Company and Hochschild entered into a vend-in agreement with MSC pursuant to which the Company agreed to contribute to MSC the mining rights of certain Santa Cruz exploration properties. The properties proposed to be transferred, totaling approximately 48,900 hectares, include amongst others the Telken, Piramides, Tobias, and Este tenements, and are in close proximity to or abutting the properties comprising the San José Mine. Hochschild will also contribute to MSC certain of their mineral properties located in the same region, totaling approximately 82,700 hectares. The agreement contains a 2% net smelter return royalty payable to the Company or Hochschild based on any of MSC’s production from the respective mineral properties contributed by each party. The vend-in agreement requires registration of title changes with the Argentinean government, which is expected to occur in the fourth quarter of 2013. The carrying value of these properties of $53.2 million, as well as the related deferred tax liability of $17.3 million, will be transferred to the Company’s investment in MSC, with no gain or loss expected to be recognized upon transfer in the fourth quarter of 2013. The mineral property interests are currently part of the “Argentina” segment in Note 11.

SHAREHOLDERS_EQUITY

SHAREHOLDERS' EQUITY	9 Months Ended
	Sep. 30, 2013
SHAREHOLDERS' EQUITY	'
SHAREHOLDERS' EQUITY	'
	NOTE 7   SHAREHOLDERS’ EQUITY
	During the nine months ended September 30, 2013, 49.9 million exchangeable shares were converted into common stock.  At September 30, 2013, total outstanding exchangeable shares not exchanged and not owned by the Company or its subsidiaries totaled 33.5 million.
	During the nine months ended September 30, 2013, the Company issued 48,000 shares of common stock upon exercise of stock options under the Equity Incentive Plan at a weighted average exercise price of $1.97 per share for proceeds of $94,720. The Company also issued 45,000 shares of common stock upon exercise of certain stock options the Company assumed as part of the Minera Andes Inc. acquisition, at a weighted average exercise price of C$1.80 per share for proceeds of $76,926. During the same period, the Company issued the final installment of 41,500 shares of common stock as payment for mining concessions in Mexico.  In addition, the Company issued 1 million shares of common stock in January 2013, which was previously recorded as a liability of $3.8 million as at December 31, 2012, as part of the litigation settlement agreement with TNR Gold Corp. effective November 2012 with respect to the Los Azules Copper Project.  The issuance of the shares resulted in the elimination of the liability in the first quarter of 2013.
	During the third quarter of 2013, the Company entered into an agreement with one of its mining contractors to settle parts of its expected future account payable with shares of common stock of the Company, up to a maximum of 2,500,000 common shares. The term of the agreement is six (6) months; provided, however, that the term may be extended by the parties. The number of shares to be issued will be determined monthly, based on the amount payable by the Company for services rendered above a certain production threshold, using the closing price quoted on active markets at the end of every month. As at September 30, 2013, the Company has agreed to issue approximately 15,800 common shares under this agreement. The fair value of this liability is included in accounts payable and accrued liabilities on the consolidated balance sheet as at September 30, 2013. The shares will be issued in the fourth quarter of 2013.

STOCKBASED_COMPENSATION

STOCK-BASED COMPENSATION	9 Months Ended
	Sep. 30, 2013
STOCK-BASED COMPENSATION	'
STOCK-BASED COMPENSATION	'
	NOTE 8   STOCK-BASED COMPENSATION
	During the nine months ended September 30, 2013, the Company granted stock options to certain employees and directors for an aggregate of 1.7 million shares of common stock at a weighted average exercise price of $2.26 per share.  The options vest equally over a three-year period if the individual remains affiliated with the Company (subject to acceleration of vesting in certain events) and are exercisable for a period of 5 years from the date of issue.  During the same period in 2012, the Company granted 0.3 million of stock options to the Company’s Chief Operating Officer, as part of his employment contract, at an exercise price of $5.80 per share. The options vest equally over a three-year period if the individual remains affiliated with the Company (subject to acceleration of vesting in certain events) and are exercisable for a period of 10 years from the date of issue.
	The Company estimates the fair value of each stock option at the grant date by using the Black-Scholes option-pricing model.  During the three and nine months ended September 30, 2013, the Company recorded stock option expense of $0.3 million and $1.0 million, respectively. During the three and nine months ended September 30, 2012, the Company recorded stock option expense of $0.7 million and $2.8 million, respectively.
	The principal assumptions used in applying the Black-Scholes option pricing model for the awards for the three and nine months ended September 30, 2013 and 2012 were as follows:
		Three Months Ended September 30,		Nine Months Ended September 30,
		2013	2012	2013	2012
	Risk-free interest rate	0.50% to 0.86%	—	0.50%	0.97%
	Dividend yield	n/a	—	n/a	n/a
	Volatility factor of the expected market price of common stock	66% to 69%	—	66%	75%
	Weighted-average expected life of option	3.5 years	—	3.5 years	6.0 years
	Weighted-average grant date fair value	$1.02	—	$1.01	$3.80

INCOME_LOSS_PER_COMMON_SHARE

INCOME (LOSS) PER COMMON SHARE	9 Months Ended
	Sep. 30, 2013
INCOME (LOSS) PER COMMON SHARE	'
INCOME (LOSS) PER COMMON SHARE	'
	NOTE 9   INCOME (LOSS) PER COMMON SHARE
	Basic net income (loss) per common share is computed by dividing net income (loss) available to common shareholders by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per common share is computed similarly except that the weighted average number of common shares is increased to reflect all dilutive instruments. Below is a reconciliation of the basic and diluted weighted average number of common shares.
		Three Months Ended					Nine Months Ended
		September 30,					September 30,
		2013		2012			2013			2012
	Net income (loss)	$	3,264	$	(2,654	)	$	(136,399	)	$	(40,369	)
	Weighted average common shares (thousands):
	Basic	297,125		268,373			297,001			256,834
	Effect of employee stock-based awards	774		—			—			—
	Diluted	297,899		268,373			297,001			256,834
	Net income (loss) per common share:
	Basic	$	0.01	$	(0.01	)	$	(0.46	)	$	(0.16	)
	Diluted	$	0.01	$	(0.01	)	$	(0.46	)	$	(0.16	)
	Outstanding options to purchase 2 million shares of common stock with a weighted average exercise prices of $5.06 were outstanding at September 30, 2013 but were not included in the computation of diluted weighted average common shares for the three months ended September 30, 2013 because their exercise prices exceeded the average price of the Company’s common stock for the period presented.
	Other outstanding options to purchase 4 million shares of common stock were not included in the computation of diluted weighted average shares in the nine months ended September 30, 2013 because their effect would have been anti-dilutive. For the three and nine months ended September 30, 2012, other outstanding options excluded from the computation of diluted weighted average shares because of their anti-dilutive effect were of 3 million shares.

RELATED_PARTY_TRANSACTIONS

RELATED PARTY TRANSACTIONS	9 Months Ended
	Sep. 30, 2013
RELATED PARTY TRANSACTIONS	'
RELATED PARTY TRANSACTIONS	'
	NOTE 10   RELATED PARTY TRANSACTIONS
	Since the second quarter of 2010, an aircraft owned and operated by Lexam L.P. (of which Robert R. McEwen is a limited partner and beneficiary) has been made available to the Company in order to expedite business travel. In his role as Chairman and Chief Executive Officer of the Company, Mr. McEwen must travel extensively and frequently on short notice.
	The Company is able to charter the aircraft from Lexam L.P. at a preferential rate. The Company’s independent board members have approved a policy whereby only the variable expenses of operating this aircraft for business related travel are eligible for reimbursement by the Company.  The hourly amount that the Company has agreed to reimburse Lexam L.P. is under half the full cost per hour of operating the aircraft or equivalent hourly charter cost and in any event less than even Mr. McEwen’s preferential charter rate. Where possible, trips also include other company personnel, both executives and non-executives, to maximize efficiency.
	The above agreement was approved by the independent members of the Company’s Board of Directors.
	For the three months ended September 30, 2013, the Company incurred and paid $9,100 (2012 - $14,809) to Lexam L.P. for the use of this aircraft. For the nine months ended September 30, 2013, the Company incurred and paid $79,625 (2012 - $218,528) for the use of this aircraft.

SEGMENTED_INFORMATION

SEGMENTED INFORMATION	9 Months Ended
	Sep. 30, 2013
SEGMENTED INFORMATION	'
SEGMENTED INFORMATION	'
	NOTE 11   SEGMENTED INFORMATION
	McEwen Mining is a mining and minerals exploration, development and production company focused on precious metals in Argentina, Mexico and the United States.  The Company identifies its reportable segments as those consolidated operations that are currently engaged in the exploration for and production of precious metals.  Operations not actively engaged in the exploration for, or production of precious metals, are aggregated at the corporate level for segment reporting purposes.
	The financial information relating to the Company’s segments is as follows:
											Corporate
		Argentina			Mexico			U.S.			& Other			Total
		(in thousands)
	For the three months ended September 30, 2013
	Gold and silver sales	$	—		$	11,778		$	—		$	—		$	11,778
	Income on investment in Minera Santa Cruz S.A. (net of amortization)	2,040			—			—			—			2,040
	Production costs applicable to sales	—			7,907			—			—			7,907
	Mine development costs	—			747			—			—			747
	Exploration costs	631			1,148			634			162			2,575
	Impairment of mineral property interests and property and equipment	—			—			6,287			—			6,287
	Gain on sale of assets	(10		)	—			(40		)	—			(50		)
	Operating income (loss)	1,131			393			(8,499		)	(1,870		)	(8,845		)
	For the nine months ended September 30, 2013
	Gold and silver sales	$	—		$	35,735		$	—		$	—		$	35,735
	Income on investment in Minera Santa Cruz S.A. (net of amortization)	252			—			—			—			252
	Production costs applicable to sales	—			26,778			—			—			26,778
	Mine development costs	—			1,316			—			—			1,316
	Exploration costs	14,110			5,582			2,084			288			22,064
	Impairment of investment in MSC	95,878			—			—			—			95,878
	Impairment of mineral property interests and property and equipment	27,729			—			6,287			—			34,016
	Loss (gain) on sale of assets	316			—			6,428			(3		)	6,741
	Operating income (loss)	(139,297		)	(2,627		)	(17,102		)	(7,840		)	(166,866		)
	As at September 30, 2013
	Investment in Minera Santa Cruz S.A.	177,080			—			—			—			177,080
	Mineral property interests	511,363			12,093			201,385			—			724,841
	Total assets	691,579			51,272			205,457			24,943			973,251
											Corporate
		Argentina			Mexico			U.S.			& Other			Total
		(in thousands)
	For the three months ended September 2012
	Gold and silver sales	—			456			—			—			456
	Income on investment in Minera Santa Cruz S.A. (net of amortization) (adjusted - note 6)	$	11,240		$	—		$	—		$	—		$	11,240
	Production costs applicable to sales	—			119			—			—			119
	Mine development and operating costs	—			2,406			—			—			2,406
	Mine construction costs	—			4,671			—			—			4,671
	Exploration costs	1,539			3,847			999			323			6,708
	Operating income (loss) (adjusted - note 6)	9,129			(12,650		)	(4,234		)	(2,870		)	(10,625		)
	For the nine months ended September 30, 2012
	Gold and silver sales	—			456			—			—			456
	Income on investment in Minera Santa Cruz S.A. (net of amortization) (adjusted - note 6)	$	14,968		$	—		$	—		$	—		$	14,968
	Production costs applicable to sales	—			119			—			—			119
	Mine development and operating costs	—			8,622			—			—			8,622
	Mine construction costs	—			13,306			—			—			13,306
	Exploration costs	11,369			12,394			3,905			897			28,565
	Operating income (loss) (adjusted - note 6)	1,440			(38,733		)	(7,864		)	(11,451		)	(56,608		)
	As at December 31, 2012
	Investment in Minera Santa Cruz S.A.	273,948			—			—			—			273,948
	Mineral property interests	539,092			12,707			215,268			—			767,067
	Total assets	825,047			47,359			220,148			58,383			1,150,937

FAIR_VALUE_ACCOUNTING

FAIR VALUE ACCOUNTING	9 Months Ended
	Sep. 30, 2013
FAIR VALUE ACCOUNTING	'
FAIR VALUE ACCOUNTING	'
	NOTE 12   FAIR VALUE ACCOUNTING
	Fair value accounting establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value.  The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets and liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements).  The three levels of the fair value hierarchy are described below:
	Level 1                  Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities;
	Level 2                  Quoted prices in markets that are not active, or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability; and
	Level 3                  Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (supported by little or no market activity).
	The following table identifies the fair value of the Company’s financial assets and liabilities by level within the fair value hierarchy.  As required by accounting guidance, assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.
		Fair Value as a September 30, 2013
		Total			Level 1		Level 2		Level 3
		(in thousands)
	Assets:
	Cash and cash equivalents	$	31,062		$	31,062	$	—	$	—
	IVA taxes receivable	10,129			—		10,129		—
		$	41,191		$	31,062	$	10,129	$	—
	Liabilities:
	Accounts payable and accrued liabilities	$	10,041		$	38	$	10,003	$	—
		$	10,041		$	38	$	10,003	$	—
		Fair Value as at December 31, 2012
		Total			Level 1		Level 2		Level 3
		(in thousands)
	Assets:
	Cash and cash equivalents	$	70,921		$	70,921	$	—	$	—
	IVA taxes receivable	9,150			—		9,150		—
		$	80,071		$	70,921	$	9,150	$	—
	Liabilities:
	Accounts payable and accrued liabilities	$	21,235		$	—	$	21,235	$	—
	Litigation settlement liability	3,830			3,830		—		—
		$	25,065		$	3,830	$	21,235	$	—
	The Company’s cash and cash equivalents is classified within Level 1 of the fair value hierarchy because it is valued using quoted market prices.  The carrying value of this balance approximates its fair value due to its short-term nature and historically negligible credit losses.  The cash equivalent instruments that are valued based on quoted market prices in active markets are primarily money market securities.
	The fair value of the IVA receivable, accounts payable and accrued liabilities approximates their carrying value due to their short-term nature.
	As at September 30, 2013, accounts payable included an accrual for the fair value of approximately 15,800 shares of common stock that are required to be issued as part of the settlement of certain amounts due by the Company to one of its vendors, as discussed in Note 7, Shareholders’ Equity. As the Company’s stock is quoted on an active market, this liability is classified within Level 1 of the fair value hierarchy.
	The litigation settlement liability at December 31, 2012 represented the fair value of the 1,000,000 shares of the Company’s common stock that were required to be issued as part of the settlement with TNR Gold Corp. Since the Company’s common stock is quoted on an active market, the liability was classified within Level 1 of the fair value hierarchy.
	In the second quarter of 2013, the Company recorded impairment charges related to its mineral property interests in the Santa Cruz Province, Argentina and its investment in MSC, as discussed in Notes 5 and 6, respectively. The estimated fair values of the Santa Cruz mineral property interests were determined using observed market value per acre in the region. The estimated fair value of the Company’s investment in MSC was determined using a discounted cash flow approach. The discounted cash flow model used significant unobservable inputs and is, therefore, considered within Level 3 of the fair value hierarchy.
	The following table sets forth a summary of the quantitative and qualitative information related to the unobservable inputs used in the calculation of the Company’s non-recurring Level 3 fair value measurements.
		Valuation		Unobservable		Range /
		Technique		Input		Weighted Average
	Investment in MSC	Discounted cash flow		Discount Rate		10.00%
				Long Term Gold Price		$1,300 per ounce
				Long Term Silver Price		$22.75 per ounce
				Argentina Inflation Index		10.00%
				United States Inflation Index		1.70%

COMPARATIVE_FIGURES

COMPARATIVE FIGURES	9 Months Ended
	Sep. 30, 2013
COMPARATIVE FIGURES	'
COMPARATIVE FIGURES	'
	NOTE 13   COMPARATIVE FIGURES
	Certain prior year information was reclassified to conform to the current year’s presentation.

INVENTORIES_Tables

INVENTORIES (Tables)	9 Months Ended
	Sep. 30, 2013
INVENTORIES	'
Schedule of inventories	'
	Inventories at September 30, 2013 and December 31, 2012 consist of the following (in thousands):
		As at September 30, 2013		As at December 31, 2012
	Ore on leach pads	$	2,795	$	685
	In-process inventory	1,572		3,604
	Stockpiles	462		308
	Precious metals	1,501		1,322
	Materials and supplies	1,477		1,343
	Inventories	$	7,807	$	7,262

GOLD_AND_SILVER_BULLION_Tables

GOLD AND SILVER BULLION (Tables)	9 Months Ended
	Sep. 30, 2013
GOLD AND SILVER BULLION	'
Schedule of gold and silver holdings	'
		As at September 30, 2013						As at December 31, 2012
		Gold			Silver			Gold			Silver
		(dollars in thousands, except ounces and per ounce)
	Number of ounces	—			—			793			24,969
	Average cost per ounce	n/a			n/a			$	1,278.63		$	27.08
	Total cost	$	—		$	—		$	1,014		$	676
	Fair value per ounce	n/a			n/a			$	1,657.50		$	29.95
	Total fair value	$	—		$	—		$	1,314		$	748
Schedule of changes of gold and silver holdings	'
		Nine months ended September 30, 2013									Year ended December 31, 2012
		Gold			Silver			Total			Gold			Silver			Total
		(in thousands)
	Opening Balance	$	1,014		$	676		$	1,690		$	7,232		$	15,578		$	22,810
	Proceeds from sale	(988		)	(479		)	(1,467		)	(7,982		)	(15,854		)	(23,836		)
	(Loss) gain on sale	(26		)	(197		)	(223		)	1,764			1,311			3,075
	Unrealized loss	—			—			—			—			(359		)	(359		)
	Ending Balance	$	—		$	—		$	—		$	1,014		$	676		$	1,690

MINERAL_PROPERTY_INTERESTS_AND1

MINERAL PROPERTY INTERESTS AND ASSET RETIREMENT OBLIGATIONS (Tables)	9 Months Ended
	Sep. 30, 2013
MINERAL PROPERTY INTERESTS AND ASSET RETIREMENT OBLIGATIONS	'
Summary of mineral property interests	'
				Three Months Ended					Nine Months Ended
				September 30,					September 30,
	Name of Property/Complex	Segment		2013			2012		2013		2012
	Telken Tenements	Argentina		$	—		$	—	$	13,792	$	—
	Este Tenements	Argentina		—			—		2,784		—
	Piramides Tenements	Argentina		—			—		5,079		—
	Tobias Tenements	Argentina		—			—		6,074		—
	West Battle Mountain Complex	Nevada		6,287			—		6,287		—
	Other United States Properties	Nevada		—			2,902		—		2,902
	Property, plant and equipment	Argentina		—			—		—		179
	Total impairment			$	6,287		$	2,902	$	34,016	$	3,081
Schedule of changes in asset retirement obligations	'
	Changes in the Company’s asset retirement obligations for the nine months ended September 30, 2013 and year ended December 31, 2012 are as follows (in thousands):
		Nine Months Ended			Year Ended
		September 30, 2013			December 31, 2012
	Asset retirement obligation liability - opening balance	$	6,359		$	6,253
	Settlements	(56		)	(47		)
	Accretion of liability	342			447
	Adjustment reflecting updated estimates	(29		)	(294		)
	Asset retirement obligation liability - ending balance	$	6,616		$	6,359

INVESTMENT_IN_MINERA_SANTA_CRU1

INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE (Tables)	9 Months Ended
	Sep. 30, 2013
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE	'
Schedule of reconciliation of fair value allocation	'
		For three months ended			For nine months ended
		September 30, 2012			September 30, 2012
		(in thousands)
	Amortization of fair value increments, as reported	$	1,597		$	3,746
	Adjustment	71			(209		)
	Amortization of fair value increments, as adjusted	$	1,668		$	3,537
	Net loss, as reported	$	(2,583	)	$	(40,578	)
	Adjustment	(71		)	209
	Net loss, as adjusted	$	(2,654	)	$	(40,369	)
Schedule of change in the entity's investment in MSC	'
		Nine Months Ended			Year Ended
		September 30, 2013			December 31, 2012
		(in thousands)
	Investment in MSC, beginning of period	$	273,948		$	—
	Fair value of investment in MSC from acquisition of Minera Andes	—			262,883
	Income from equity investment	3,914			25,301
	Amortization of fair value increments	(3,662		)	(4,466		)
	Dividend distribution	(1,242		)	(9,770		)
	Impairment of investment in MSC	(95,878		)	—
	Investment in MSC, end of period	$	177,080		$	273,948
Summary of MSC's financial information from operations	'
		Three Months Ended			Three Months Ended			Nine Months Ended			Period ended
		September 30, 2013			September 30, 2012			September 30, 2013			September 30, 2012
		(in thousands)
	Sales - MSC 100%	$	69,662		$	116,299		$	182,031		$	212,902
	Net income - MSC 100%	5,424			26,343			7,988			37,765
	McEwen Mining’s portion - 49%	2,658			12,908			3,914			18,505
	Net income on investment in MSC	$	2,658		$	12,908		$	3,914		$	18,505
	Amortization of fair value increments	(618		)	(1,668		)	(3,662		)	(3,537		)
	Income on investment in MSC, net of amortization	$	2,040		$	11,240		$	252		$	14,968

STOCKBASED_COMPENSATION_Tables

STOCK-BASED COMPENSATION (Tables)	9 Months Ended
	Sep. 30, 2013
STOCK-BASED COMPENSATION	'
Schedule of principal assumptions used in applying the Black-Scholes option pricing model for the awards	'
		Three Months Ended September 30,		Nine Months Ended September 30,
		2013	2012	2013	2012
	Risk-free interest rate	0.50% to 0.86%	—	0.50%	0.97%
	Dividend yield	n/a	—	n/a	n/a
	Volatility factor of the expected market price of common stock	66% to 69%	—	66%	75%
	Weighted-average expected life of option	3.5 years	—	3.5 years	6.0 years
	Weighted-average grant date fair value	$1.02	—	$1.01	$3.80

INCOME_LOSS_PER_COMMON_SHARE_T

INCOME (LOSS) PER COMMON SHARE (Tables)	9 Months Ended
	Sep. 30, 2013
INCOME (LOSS) PER COMMON SHARE	'
Schedule of computation of basic and diluted net income (loss) per common share and reconciliation weighted average number of common shares	'
		Three Months Ended					Nine Months Ended
		September 30,					September 30,
		2013		2012			2013			2012
	Net income (loss)	$	3,264	$	(2,654	)	$	(136,399	)	$	(40,369	)
	Weighted average common shares (thousands):
	Basic	297,125		268,373			297,001			256,834
	Effect of employee stock-based awards	774		—			—			—
	Diluted	297,899		268,373			297,001			256,834
	Net income (loss) per common share:
	Basic	$	0.01	$	(0.01	)	$	(0.46	)	$	(0.16	)
	Diluted	$	0.01	$	(0.01	)	$	(0.46	)	$	(0.16	)

SEGMENTED_INFORMATION_Tables

SEGMENTED INFORMATION (Tables)	9 Months Ended
	Sep. 30, 2013
SEGMENTED INFORMATION	'
Schedule of the financial information relating to the Company's segments	'
											Corporate
		Argentina			Mexico			U.S.			& Other			Total
		(in thousands)
	For the three months ended September 30, 2013
	Gold and silver sales	$	—		$	11,778		$	—		$	—		$	11,778
	Income on investment in Minera Santa Cruz S.A. (net of amortization)	2,040			—			—			—			2,040
	Production costs applicable to sales	—			7,907			—			—			7,907
	Mine development costs	—			747			—			—			747
	Exploration costs	631			1,148			634			162			2,575
	Impairment of mineral property interests and property and equipment	—			—			6,287			—			6,287
	Gain on sale of assets	(10		)	—			(40		)	—			(50		)
	Operating income (loss)	1,131			393			(8,499		)	(1,870		)	(8,845		)
	For the nine months ended September 30, 2013
	Gold and silver sales	$	—		$	35,735		$	—		$	—		$	35,735
	Income on investment in Minera Santa Cruz S.A. (net of amortization)	252			—			—			—			252
	Production costs applicable to sales	—			26,778			—			—			26,778
	Mine development costs	—			1,316			—			—			1,316
	Exploration costs	14,110			5,582			2,084			288			22,064
	Impairment of investment in MSC	95,878			—			—			—			95,878
	Impairment of mineral property interests and property and equipment	27,729			—			6,287			—			34,016
	Loss (gain) on sale of assets	316			—			6,428			(3		)	6,741
	Operating income (loss)	(139,297		)	(2,627		)	(17,102		)	(7,840		)	(166,866		)
	As at September 30, 2013
	Investment in Minera Santa Cruz S.A.	177,080			—			—			—			177,080
	Mineral property interests	511,363			12,093			201,385			—			724,841
	Total assets	691,579			51,272			205,457			24,943			973,251
											Corporate
		Argentina			Mexico			U.S.			& Other			Total
		(in thousands)
	For the three months ended September 2012
	Gold and silver sales	—			456			—			—			456
	Income on investment in Minera Santa Cruz S.A. (net of amortization) (adjusted - note 6)	$	11,240		$	—		$	—		$	—		$	11,240
	Production costs applicable to sales	—			119			—			—			119
	Mine development and operating costs	—			2,406			—			—			2,406
	Mine construction costs	—			4,671			—			—			4,671
	Exploration costs	1,539			3,847			999			323			6,708
	Operating income (loss) (adjusted - note 6)	9,129			(12,650		)	(4,234		)	(2,870		)	(10,625		)
	For the nine months ended September 30, 2012
	Gold and silver sales	—			456			—			—			456
	Income on investment in Minera Santa Cruz S.A. (net of amortization) (adjusted - note 6)	$	14,968		$	—		$	—		$	—		$	14,968
	Production costs applicable to sales	—			119			—			—			119
	Mine development and operating costs	—			8,622			—			—			8,622
	Mine construction costs	—			13,306			—			—			13,306
	Exploration costs	11,369			12,394			3,905			897			28,565
	Operating income (loss) (adjusted - note 6)	1,440			(38,733		)	(7,864		)	(11,451		)	(56,608		)
	As at December 31, 2012
	Investment in Minera Santa Cruz S.A.	273,948			—			—			—			273,948
	Mineral property interests	539,092			12,707			215,268			—			767,067
	Total assets	825,047			47,359			220,148			58,383			1,150,937

FAIR_VALUE_ACCOUNTING_Tables

FAIR VALUE ACCOUNTING (Tables)	9 Months Ended
	Sep. 30, 2013
FAIR VALUE ACCOUNTING	'
Schedule of assets and liabilities measured at fair value on a recurring basis by level within the fair value hierarchy	'
		Fair Value as a September 30, 2013
		Total			Level 1		Level 2		Level 3
		(in thousands)
	Assets:
	Cash and cash equivalents	$	31,062		$	31,062	$	—	$	—
	IVA taxes receivable	10,129			—		10,129		—
		$	41,191		$	31,062	$	10,129	$	—
	Liabilities:
	Accounts payable and accrued liabilities	$	10,041		$	38	$	10,003	$	—
		$	10,041		$	38	$	10,003	$	—
		Fair Value as at December 31, 2012
		Total			Level 1		Level 2		Level 3
		(in thousands)
	Assets:
	Cash and cash equivalents	$	70,921		$	70,921	$	—	$	—
	IVA taxes receivable	9,150			—		9,150		—
		$	80,071		$	70,921	$	9,150	$	—
	Liabilities:
	Accounts payable and accrued liabilities	$	21,235		$	—	$	21,235	$	—
	Litigation settlement liability	3,830			3,830		—		—
		$	25,065		$	3,830	$	21,235	$	—
Summary of the quantitative and qualitative information related to the unobservable inputs used in the calculation of the Company's non-recurring Level 3 fair value measurements	'
		Valuation		Unobservable		Range /
		Technique		Input		Weighted Average
	Investment in MSC	Discounted cash flow		Discount Rate		10.00%
				Long Term Gold Price		$1,300 per ounce
				Long Term Silver Price		$22.75 per ounce
				Argentina Inflation Index		10.00%
				United States Inflation Index		1.70%

NATURE_OF_OPERATIONS_AND_SUMMA1

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (MSC)	Sep. 30, 2013	Jan. 24, 2012
MSC	'	'
Nature of Operations and Basis of Presentation	'	'
Ownership interest (as a percent)	49.00%	49.00%

NATURE_OF_OPERATIONS_AND_SUMMA2

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (Gold equivalents, El Gallo mine)	3 Months Ended	9 Months Ended	12 Months Ended	13 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013
	oz	oz	oz	oz
Gold equivalents | El Gallo mine	'	'	'	'
Nature of Operations and Basis of Presentation	'	'	'	'
Quantity produced (in ounces)	8,027	23,370	6,949	30,319

BUSINESS_ACQUISITION_Details

BUSINESS ACQUISITION (Details) (Minera Andes)	0 Months Ended	9 Months Ended
	Jan. 24, 2012	Sep. 30, 2013
Minera Andes	'	'
BUSINESS ACQUISITION	'	'
Exchange ratio	0.45	'
Exchangeable shares issued	127,331,498	'
Ratio for exchange of exchangeable shares	'	1

BUSINESS_ACQUISITION_Details_2

BUSINESS ACQUISITION (Details 2) (USD $)	3 Months Ended		9 Months Ended				3 Months Ended	0 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Jan. 24, 2012	Jun. 30, 2013	Jan. 24, 2012	Sep. 30, 2013	Dec. 31, 2012
							Santa Cruz mineral property interests	Minera Andes	Minera Andes	Minera Andes
BUSINESS ACQUISITION	'	'	'	'	'	'	'	'	'	'
Market price of common stock (in dollars per share)	'	'	'	'	'	$5.22	'	'	'	'
Net assets acquired:	'	'	'	'	'	'	'	'	'	'
Purchase price	'	'	'	'	'	'	'	$667,800,000	'	'
Excess of fair value over carrying value of the underlying assets for tax purposes	'	'	'	'	'	'	'	508,500,000	'	'
Deferred income tax recovery related to fluctuations in foreign exchange rates	'	'	'	'	'	'	'	'	23,600,000	'
Deferred income tax recovery	'	'	'	'	'	'	2,300,000	'	'	'
Impairment charges	6,287,000	2,902,000	34,016,000	3,081,000	'	'	27,700,000	'	'	'
Deferred income tax liability related to fluctuations in the foreign exchange rates	'	'	'	'	'	'	'	178,000,000	131,000,000	156,900,000
Deferred income tax liability	$198,497,000	'	$198,497,000	'	$229,522,000	'	'	'	'	'

INVENTORIES_Details

INVENTORIES (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
INVENTORIES	'	'
Ore on leach pads	$2,795	$685
In-process inventory	1,572	3,604
Stockpiles	462	308
Precious metals	1,501	1,322
Materials and supplies	1,477	1,343
Inventories	$7,807	$7,262

GOLD_AND_SILVER_BULLION_Detail

GOLD AND SILVER BULLION (Details) (USD $)

3 Months Ended

9 Months Ended

12 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Jun. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Jun. 30, 2013

Gold

Gold

Gold

Gold

Silver

Silver

Silver

Silver

oz

oz

GOLD AND SILVER BULLION

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of ounces

'

'

'

'

'

'

'

793

'

'

'

24,969

'

Average cost per ounce (in dollars per ounce)

'

'

'

'

'

'

'

1,278.63

1,278.63

'

'

27.08

27.08

Total cost

'

'

'

'

$1,690

'

'

$1,014

'

'

'

$676

'

Fair value per ounce (in dollars per ounce)

'

'

'

'

'

'

'

1,657.50

'

'

'

29.95

'

Total fair value

'

'

'

'

'

'

'

1,314

'

'

'

748

'

Changes in the Company's holdings of gold and silver

'

'

'

'

'

'

'

'

'

'

'

'

'

Opening Balance

'

'

1,690

22,810

22,810

'

1,014

7,232

'

'

676

15,578

'

Proceeds from sale

'

'

-1,467

'

-23,836

'

-988

-7,982

'

'

-479

-15,854

'

(Loss) gain on sale

51

1,233

-223

3,075

3,075

'

-26

1,764

'

'

-197

1,311

'

Unrealized loss

'

'

'

-359

-359

'

'

'

'

'

'

-359

'

Ending Balance

'

'

'

'

$1,690

'

'

$1,014

'

'

'

$676

'

Selling price per ounce (in dollars per ounce)

'

'

'

'

'

1,245.70

'

'

'

19.18

'

'

'

MINERAL_PROPERTY_INTERESTS_AND2

MINERAL PROPERTY INTERESTS AND ASSET RETIREMENT OBLIGATIONS (Details) (USD $)

3 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

13 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2012

31-May-13

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Jun. 30, 2013

Sep. 30, 2013

Jun. 30, 2013

Sep. 30, 2013

Argentina

Telken Tenements

Este Tenements

Piramides Tenements

Tobias Tenements

Property, plant and equipment

Other United States Properties

Other United States Properties

Limo Complex

Limo Complex

El Gallo Complex

El Gallo Complex

El Gallo Complex

El Gallo Complex

El Gallo Complex

El Gallo Complex

Tonkin property and El Gallo 1 mine portion of the El Gallo Complex

West Battle Mountain Complex

West Battle Mountain Complex

West Battle Mountain Complex

West Battle Mountain Complex

Exploration properties in Santa Cruz, Argentina

Exploration properties in Santa Cruz, Argentina

Exploration properties in Santa Cruz, Argentina

Tonkin Complex

Argentina

Nevada

Nevada

Gold equivalents

Gold equivalents

Gold equivalents

Gold equivalents

Item

Nevada

Nevada

MSC

oz

oz

oz

oz

Mineral Property Interests

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Quantity produced (in ounces)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8,027

23,370

6,949

30,319

'

'

'

'

'

'

'

'

'

Number of most significant properties subject to reclamation obligations

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

Undiscounted estimated reclamation costs

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$4,600,000

$4,600,000

'

'

'

'

'

'

'

'

'

'

'

'

$3,800,000

Cash bonding for mineral properties in the United States

5,183,000

'

5,183,000

'

5,183,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amortization of mineral property interests and asset retirement obligations

'

'

1,244,000

'

'

'

'

'

'

'

'

'

'

'

'

300,000

1,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Price of mineral property interests under the sale agreement

'

'

'

'

'

'

'

'

'

'

'

'

'

800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Carrying value of mining claims

'

'

'

'

'

'

'

'

'

'

'

'

'

7,200,000

'

'

'

'

'

'

'

'

6,300,000

6,300,000

'

'

'

'

'

'

Loss on disposal

'

'

'

'

'

'

'

'

'

'

'

'

'

6,400,000

3,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Tax on mining real estate property (as a percent)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.00%

'

1.00%

'

Impairment charges

6,287,000

2,902,000

34,016,000

3,081,000

'

27,729,000

13,792,000

2,784,000

5,079,000

6,074,000

179,000

2,902,000

2,902,000

'

'

'

'

'

'

'

'

'

'

'

6,287,000

6,287,000

27,700,000

'

'

'

Deferred income tax

'

'

'

'

'

'

'

'

'

'

'

'

'

2,500,000

'

'

'

'

'

'

'

'

2,200,000

'

'

'

'

2,300,000

'

'

Net impairment charge

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4,100,000

4,100,000

'

'

'

25,400,000

'

'

Changes in the asset retirement obligations

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Asset retirement obligation liability - opening balance

'

'

6,359,000

6,253,000

6,253,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Settlements

'

'

-56,000

'

-47,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accretion of liability

113,000

110,000

347,000

342,000

447,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Adjustment reflecting updated estimates

'

'

-29,000

'

-294,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Asset retirement obligation liability - ending balance

6,616,000

'

6,616,000

'

6,359,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Current portion of the asset retirement obligation

$1,351,000

'

$1,351,000

'

$130,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

INVESTMENT_IN_MINERA_SANTA_CRU2

INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE (Details) (USD $)	3 Months Ended				8 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Jan. 24, 2012
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE	'	'	'	'	'	'	'	'	'
Net loss	$3,264,000	'	'	($2,654,000)	'	($136,399,000)	($40,369,000)	'	'
Impairment	'	'	'	'	'	95,878,000	'	'	'
Exploration properties in Santa Cruz, Argentina	'	'	'	'	'	'	'	'	'
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE	'	'	'	'	'	'	'	'	'
Tax on mining real estate property (as a percent)	'	1.00%	'	'	'	'	'	'	'
Reported	'	'	'	'	'	'	'	'	'
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE	'	'	'	'	'	'	'	'	'
Net loss	'	'	'	-2,583,000	'	'	-40,578,000	'	'
Adjustment	'	'	'	'	'	'	'	'	'
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE	'	'	'	'	'	'	'	'	'
Net loss	'	'	'	-71,000	'	'	209,000	'	'
MSC	'	'	'	'	'	'	'	'	'
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE	'	'	'	'	'	'	'	'	'
Interest acquired (as a percent)	49.00%	'	'	'	'	49.00%	'	'	'
Entity's share in earnings and losses from its investment in MSC	2,658,000	'	'	12,908,000	18,505,000	3,914,000	'	25,301,000	'
Net income	5,424,000	'	'	26,343,000	37,765,000	7,988,000	'	'	'
Interest held (as a percent)	49.00%	'	'	'	'	49.00%	'	'	49.00%
Fair value of investment in MSC from acquisition of Minera Andes	'	'	'	261,200,000	261,200,000	'	261,200,000	262,883,000	'
Amortization of fair value increments	618,000	'	'	1,668,000	3,537,000	3,662,000	3,537,000	4,466,000	'
Equity method investment, overstatement of income from prior year recorded in current period	'	'	3,900,000	'	'	'	'	'	'
Entity's share of income in investee, overstatement of income from prior year recorded in current period	'	'	1,900,000	'	'	'	'	'	'
Impairment	'	95,900,000	'	'	'	95,878,000	'	'	'
MSC | Exploration properties in Santa Cruz, Argentina	'	'	'	'	'	'	'	'	'
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE	'	'	'	'	'	'	'	'	'
Tax on mining real estate property (as a percent)	'	1.00%	'	'	'	'	'	'	'
MSC | Minimum | Exploration properties in Santa Cruz, Argentina	'	'	'	'	'	'	'	'	'
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE	'	'	'	'	'	'	'	'	'
Tax payable	'	2,000,000	'	'	'	'	'	'	'
MSC | Maximum | Exploration properties in Santa Cruz, Argentina	'	'	'	'	'	'	'	'	'
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE	'	'	'	'	'	'	'	'	'
Tax payable	'	3,000,000	'	'	'	'	'	'	'
MSC | Reported	'	'	'	'	'	'	'	'	'
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE	'	'	'	'	'	'	'	'	'
Amortization of fair value increments	'	'	'	1,597,000	'	'	3,746,000	'	'
MSC | Adjustment	'	'	'	'	'	'	'	'	'
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE	'	'	'	'	'	'	'	'	'
Amortization of fair value increments	'	'	'	71,000	'	'	-209,000	'	'
MSC | Purchase price allocation adjustment	'	'	'	'	'	'	'	'	'
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE	'	'	'	'	'	'	'	'	'
Fair value of investment in MSC from acquisition of Minera Andes	'	'	'	'	'	'	'	$262,900,000	'

INVESTMENT_IN_MINERA_SANTA_CRU3

INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE (Details 2) (USD $)	3 Months Ended			8 Months Ended	9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Change in the investment in MSC	'	'	'	'	'	'	'
Investment in MSC, beginning of period	'	'	'	'	$273,948	'	'
Impairment of investment in MSC	'	'	'	'	-95,878	'	'
Investment in MSC, end of period	177,080	'	'	'	177,080	'	'
MSC	'	'	'	'	'	'	'
Change in the investment in MSC	'	'	'	'	'	'	'
Investment in MSC, beginning of period	'	'	'	'	273,948	'	'
Fair value of investment in MSC from acquisition of Minera Andes	'	'	261,200	261,200	'	261,200	262,883
Income from equity investment	2,658	'	12,908	18,505	3,914	'	25,301
Amortization of fair value increments	-618	'	-1,668	-3,537	-3,662	-3,537	-4,466
Dividend distribution	'	'	'	'	-1,242	'	-9,770
Impairment of investment in MSC	'	-95,900	'	'	-95,878	'	'
Investment in MSC, end of period	$177,080	'	'	'	$177,080	'	$273,948

INVESTMENT_IN_MINERA_SANTA_CRU4

INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE (Details 3) (USD $)

3 Months Ended

9 Months Ended

12 Months Ended

3 Months Ended

8 Months Ended

9 Months Ended

12 Months Ended

1 Months Ended

3 Months Ended

1 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Jun. 30, 2013

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Jan. 24, 2012

Oct. 31, 2013

Dec. 31, 2013

Oct. 31, 2013

MSC

MSC

MSC

MSC

MSC

MSC

MSC

MSC

MSC

MSC

MSC

Vend-in agreement

Vend-in agreement

Hochschild

Item

Subsequent event

Item

INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Sales percentage

'

'

'

'

'

100.00%

'

100.00%

100.00%

100.00%

'

'

'

'

'

'

Sales

'

'

'

'

'

$69,662,000

'

$116,299,000

$212,902,000

$182,031,000

'

'

'

'

'

'

Net income percentage

'

'

'

'

'

100.00%

'

100.00%

100.00%

100.00%

'

'

'

'

'

'

Net income

'

'

'

'

'

5,424,000

'

26,343,000

37,765,000

7,988,000

'

'

'

'

'

'

Ownership interest (as a percent)

'

'

'

'

'

49.00%

'

'

'

49.00%

'

'

49.00%

'

'

'

Net income on investment in MSC

'

'

'

'

'

2,658,000

'

12,908,000

18,505,000

3,914,000

'

25,301,000

'

'

'

'

Amortization of fair value increments

'

'

'

'

'

-618,000

'

-1,668,000

-3,537,000

-3,662,000

-3,537,000

-4,466,000

'

'

'

'

Income on investment in MSC, net of amortization

2,040,000

11,240,000

252,000

14,968,000

'

2,040,000

'

11,240,000

14,968,000

252,000

'

'

'

'

'

'

Current assets

50,920,000

'

50,920,000

'

91,918,000

120,200,000

'

'

'

120,200,000

'

'

'

'

'

'

Total assets

973,251,000

'

973,251,000

'

1,150,937,000

522,400,000

'

'

'

522,400,000

'

'

'

'

'

'

Current liabilities

11,392,000

'

11,392,000

'

25,195,000

56,400,000

'

'

'

56,400,000

'

'

'

'

'

'

Total liabilities

215,554,000

'

215,554,000

'

261,346,000

166,800,000

'

'

'

166,800,000

'

'

'

'

'

'

Impairment of investment in Minera Santa Cruz S.A.

'

'

95,878,000

'

'

'

95,900,000

'

'

95,878,000

'

'

'

'

'

'

Area of property transferred

'

'

'

'

'

'

'

'

'

'

'

'

'

48,900

'

82,700

Net smelter return royalty payable (as a percent)

'

'

'

'

'

'

'

'

'

'

'

'

'

2.00%

'

'

Carrying value of mining claims

'

'

'

'

'

'

'

'

'

'

'

'

'

'

53,200,000

'

Deferred tax liability related to mineral properties

'

'

'

'

'

'

'

'

'

'

'

'

'

'

17,300,000

'

Expected gain or loss to be recognized

$51,000

$1,233,000

($223,000)

$3,075,000

$3,075,000

'

'

'

'

'

'

'

'

'

$0

'

SHAREHOLDERS_EQUITY_Details

SHAREHOLDERS' EQUITY (Details) (USD $)	1 Months Ended	3 Months Ended	9 Months Ended			3 Months Ended	0 Months Ended
	Jan. 31, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013	Jan. 24, 2012	Dec. 31, 2012
		Item	Item			Maximum	Minera Andes Inc.	Litigation settlement agreement with respect to the Los Azules Copper Project
								TNR
Exchangeable shares converted into common stock	'	'	49,900,000	'	'	'	'	'
Outstanding Exchangeable Shares not exchanged	'	33,500,000	33,500,000	'	'	'	'	'
Shares of common stock issued upon exercise of stock options	1,000,000	'	48,000	'	'	'	45,000	'
Weighted average exercise price of stock options (in dollars per share)	'	'	$1.97	'	'	'	$1.80	'
Proceeds from exercise of stock options	'	'	$171,000	$3,564,000	'	'	$76,926	'
Shares of common stock issued as payment for mining concessions in Mexico	'	'	41,500	'	'	'	'	'
Settlement agreement regarding outstanding litigation	'	'	'	'	'	'	'	'
Litigation settlement liability	'	'	'	'	$3,830,000	'	'	$3,800,000
Number of mining contractors with which the entity has entered into an agreement	'	1	1	'	'	'	'	'
Number of shares to be issued to settle parts of expected future account payable	'	'	'	'	'	2,500,000	'	'
Term of the agreement	'	'	'6 months	'	'	'	'	'
Number of shares agreed to be issued under the agreement	'	'	15,800	'	'	'	'	'

STOCKBASED_COMPENSATION_Detail

STOCK-BASED COMPENSATION (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
STOCK-BASED COMPENSATION	'	'	'	'
Stock option expense	$0.30	$0.70	$1	$2.80
Principal assumptions used in applying the Black-Scholes option pricing model for the awards	'	'	'	'
Risk-free interest rate (as a percent)	'	'	0.50%	0.97%
Volatility factor of the expected market price of common stock (as a percent)	'	'	66.00%	75.00%
Weighted-average expected life of option	'3 years 6 months	'	'3 years 6 months	'6 years
Weighted-average grant date fair value (in dollars per share)	$1.02	'	$1.01	$3.80
Minimum	'	'	'	'
Principal assumptions used in applying the Black-Scholes option pricing model for the awards	'	'	'	'
Risk-free interest rate (as a percent)	0.50%	'	'	'
Volatility factor of the expected market price of common stock (as a percent)	66.00%	'	'	'
Maximum	'	'	'	'
Principal assumptions used in applying the Black-Scholes option pricing model for the awards	'	'	'	'
Risk-free interest rate (as a percent)	0.86%	'	'	'
Volatility factor of the expected market price of common stock (as a percent)	69.00%	'	'	'
Certain employees and directors	'	'	'	'
STOCK-BASED COMPENSATION	'	'	'	'
Stock options granted (in shares)	'	'	1.7	'
Exercise price of options granted (in dollars per share)	'	'	$2.26	'
Vesting period of options	'	'	'3 years	'
Exercise period of options	'	'	'5 years	'
Chief Operating Officer	'	'	'	'
STOCK-BASED COMPENSATION	'	'	'	'
Stock options granted (in shares)	'	'	'	0.3
Exercise price of options granted (in dollars per share)	'	'	'	$5.80
Vesting period of options	'	'	'	'3 years
Exercise period of options	'	'	'	'10 years

INCOME_LOSS_PER_COMMON_SHARE_D

INCOME (LOSS) PER COMMON SHARE (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
INCOME (LOSS) PER COMMON SHARE	'	'	'	'
Net income (loss) (in dollars)	$3,264	($2,654)	($136,399)	($40,369)
Weighted average common shares:	'	'	'	'
Basic (in shares)	297,125,000	268,373,000	297,001,000	256,834,000
Effect of employee stock-based awards (in shares)	774,000	'	'	'
Diluted (in shares)	297,899,000	268,373,000	297,001,000	256,834,000
Net income (loss) per common share:	'	'	'	'
Basic (in dollars per share)	$0.01	($0.01)	($0.46)	($0.16)
Diluted (in dollars per share)	$0.01	($0.01)	($0.46)	($0.16)
Outstanding options (in shares)	2,000,000	'	2,000,000	'
Weighted average exercise prices of options outstanding (in dollars per share)	$5.06	'	$5.06	'
Other outstanding options not included in the computation of diluted weighted average shares because their effect would have been anti-dilutive (in shares)	'	3,000,000	4,000,000	3,000,000

RELATED_PARTY_TRANSACTIONS_Det

RELATED PARTY TRANSACTIONS (Details) (Lexam L.P., USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Lexam L.P.	'	'	'	'
RELATED PARTY TRANSACTIONS	'	'	'	'
Amount of expenses incurred and paid	$9,100	$14,809	$79,625	$218,528

SEGMENTED_INFORMATION_Details

SEGMENTED INFORMATION (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
SEGMENTED INFORMATION	'	'	'	'	'
Gold and silver sales	$11,778	$456	$35,735	$456	'
Income on investment in Minera Santa Cruz S.A. (net of amortization)	2,040	11,240	252	14,968	'
Production costs applicable to sales	7,907	119	26,778	119	'
Mine development and operating costs	747	2,406	1,316	8,622	'
Mine construction costs	'	4,671	'	13,306	'
Exploration costs	2,575	6,708	22,064	28,565	'
Impairment of investment in Minera Santa Cruz S.A.	'	'	95,878	'	'
Impairment of mineral property interests and property and equipment	6,287	2,902	34,016	3,081	'
Loss (gain) on sale of assets	-50	-1,135	6,741	-1,265	'
Operating income (loss)	-8,845	-10,625	-166,866	-56,608	'
Investment in Minera Santa Cruz S.A.	177,080	'	177,080	'	273,948
Mineral property interests	724,841	'	724,841	'	767,067
Total assets	973,251	'	973,251	'	1,150,937
Argentina	'	'	'	'	'
SEGMENTED INFORMATION	'	'	'	'	'
Income on investment in Minera Santa Cruz S.A. (net of amortization)	2,040	11,240	252	14,968	'
Exploration costs	631	1,539	14,110	11,369	'
Impairment of investment in Minera Santa Cruz S.A.	'	'	95,878	'	'
Impairment of mineral property interests and property and equipment	'	'	27,729	'	'
Loss (gain) on sale of assets	-10	'	316	'	'
Operating income (loss)	1,131	9,129	-139,297	1,440	'
Investment in Minera Santa Cruz S.A.	177,080	'	177,080	'	273,948
Mineral property interests	511,363	'	511,363	'	539,092
Total assets	691,579	'	691,579	'	825,047
Mexico	'	'	'	'	'
SEGMENTED INFORMATION	'	'	'	'	'
Gold and silver sales	11,778	456	35,735	456	'
Production costs applicable to sales	7,907	119	26,778	119	'
Mine development and operating costs	747	2,406	1,316	8,622	'
Mine construction costs	'	4,671	'	13,306	'
Exploration costs	1,148	3,847	5,582	12,394	'
Operating income (loss)	393	-12,650	-2,627	-38,733	'
Mineral property interests	12,093	'	12,093	'	12,707
Total assets	51,272	'	51,272	'	47,359
United States	'	'	'	'	'
SEGMENTED INFORMATION	'	'	'	'	'
Exploration costs	634	999	2,084	3,905	'
Impairment of mineral property interests and property and equipment	6,287	'	6,287	'	'
Loss (gain) on sale of assets	-40	'	6,428	'	'
Operating income (loss)	-8,499	-4,234	-17,102	-7,864	'
Mineral property interests	201,385	'	201,385	'	215,268
Total assets	205,457	'	205,457	'	220,148
Corporate & Other	'	'	'	'	'
SEGMENTED INFORMATION	'	'	'	'	'
Exploration costs	162	323	288	897	'
Loss (gain) on sale of assets	'	'	-3	'	'
Operating income (loss)	-1,870	-2,870	-7,840	-11,451	'
Total assets	$24,943	'	$24,943	'	$58,383

FAIR_VALUE_ACCOUNTING_Details

FAIR VALUE ACCOUNTING (Details) (USD $)

3 Months Ended

9 Months Ended

12 Months Ended

3 Months Ended

In Thousands, except Share data, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Item

Item

Litigation settlement agreement with respect to the Los Azules Copper Project

Recurring

Recurring

Recurring

Recurring

Recurring

Recurring

Nonrecurring

Nonrecurring

Nonrecurring

TNR

Total

Total

Level 1

Level 1

Level 2

Level 2

Level 3

Level 3

Level 3

MSC

MSC

MSC

Discounted cash flow

Discounted cash flow

Discounted cash flow

Weighted Average

Weighted Average

Weighted Average

Argentina

United States

Assets:

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash and cash equivalents

'

'

'

'

$31,062

$70,921

$31,062

$70,921

'

'

'

'

'

IVA taxes receivable

10,129

10,129

9,150

'

10,129

9,150

'

'

10,129

9,150

'

'

'

Assets

'

'

'

'

41,191

80,071

31,062

70,921

10,129

9,150

'

'

'

Liabilities:

'

'

'

'

'

'

'

'

'

'

'

'

'

Accounts payable and accrued liabilities

'

'

'

'

10,041

21,235

38

'

10,003

21,235

'

'

'

Litigation settlement liabilities

'

'

'

'

'

3,830

'

3,830

'

'

'

'

'

Liabilities

'

'

'

'

$10,041

$25,065

$38

$3,830

$10,003

$21,235

'

'

'

Shares of common stock required to be issued as part of settlement

'

'

'

1,000,000

'

'

'

'

'

'

'

'

'

Number of shares of common stock required to be issued as a part of settlement

'

15,800

'

'

'

'

'

'

'

'

'

'

'

Number of vendors to which shares of common stock are required to be issued as a part of settlement

1

1

'

'

'

'

'

'

'

'

'

'

'

Discount Rate (as a percent)

'

'

'

'

'

'

'

'

'

'

10.00%

'

'

Long Term Gold Price (in dollars per ounce)

'

'

'

'

'

'

'

'

'

'

1,300

'

'

Long Term Silver Price (in dollars per ounce)

'

'

'

'

'

'

'

'

'

'

22.75

'

'

Inflation index (as a percent)

'

'

'

'

'

'

'

'

'

'

'

10.00%

1.70%