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Mining Properties (Details Textual) - USD ($) $ in Thousands, shares in Millions |  |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 25, 2016 | May 31, 2016 | Apr. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Apr. 19, 2016
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Gain on sale of assets |  |  |  |  | $ 4,498 | $ 333 | $ 8,983 | $ 396 |
Write-downs |  |  |  |  | $ 0 | $ 0 | $ 4,446 | $ 0 |
Cerro Bayo Mine [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Net smelter return paid (as a percent) |  |  |  | 2.00% |  |  |  |  |
Transfer of Financial Assets Accounted for as Sales, Cash Proceeds Received for Assets Derecognized, Amount |  |  |  | $ 5,700 |  |  |  |  |
Proceeds from Sale of Productive Assets |  |  |  | $ 4,000 |  |  |  |  |
Disposition of Assets, Consideration Transferred, Shares Received |  |  |  | 2.5 |  |  |  |  |
Gain on sale of assets |  |  |  | $ 1,900 |  |  |  |  |
Endeavor [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Mineral Interests, Percent |  |  |  |  |  |  | 100.00% |  |
Write-downs |  |  |  |  |  |  | $ 2,500 |  |
McEwen Mining Inc, El Gallo, Magistral Mine [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Transfer of Financial Assets Accounted for as Sales, Cash Proceeds Received for Assets Derecognized, Amount |  |  |  |  |  |  |  |  | $ 6,300
Write-downs |  |  |  |  |  |  | $ 1,900 |  |
Disposition of Assets, Contingent Consideration, Asset |  |  |  |  |  |  |  |  | $ 1,000
La Cigarra [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Net smelter return paid (as a percent) |  |  | 2.50% |  |  |  |  |  |
Transfer of Financial Assets Accounted for as Sales, Cash Proceeds Received for Assets Derecognized, Amount |  |  | $ 3,600 |  |  |  |  |  |
Proceeds from Sale of Productive Assets |  |  | $ 500 |  |  |  |  |  |
Disposition of Assets, Consideration Transferred, Shares Received |  |  | 9.6 |  |  |  |  |  |
Gain on sale of assets |  |  | $ 0 |  |  |  |  |  |
Martha [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Transfer of Financial Assets Accounted for as Sales, Cash Proceeds Received for Assets Derecognized, Amount |  | $ 3,000 |  |  |  |  |  |  |
Proceeds from Sale of Productive Assets |  | 1,500 |  |  |  |  |  |  |
Disposition of Assets, Receivable, Asset |  | 1,500 |  |  |  |  |  |  |
Gain on sale of assets |  | $ 5,300 |  |  |  |  |  |  |
Correnso [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Transfer of Financial Assets Accounted for as Sales, Cash Proceeds Received for Assets Derecognized, Amount | $ 5,400 |  |  |  |  |  |  |  |
Gain on sale of assets | 4,700 |  |  |  |  |  |  |  |
Disposition of Assets, Contingent Consideration, Asset | $ 700 |  |  |  |  |  |  |  |

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