Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	Mar. 13, 2020	Jun. 28, 2019
Document and Entity Information
Document Type	10-K/A
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-33190
Entity Registrant Name	MCEWEN MINING INC.
Entity Incorporation, State or Country Code	CO
Entity Tax Identification Number	84-0796160
Entity Address, Address Line One	150 King Street West
Entity Address, Address Line Two	Suite 2800
Entity Address, City or Town	Toronto
Entity Address, State or Province	ON
Entity Address, Country	CA
Entity Address, Postal Zip Code	M5H 1J9
City Area Code	866
Local Phone Number	441-0690
Title of 12(b) Security	Common Stock, no par value
Trading Symbol	MUX
Security Exchange Name	NYSE
Amendment Description	McEwen Mining Inc. (the "Company") is filing this Amendment No. 1 on Form 10-K/A (this "Amendment") to its Annual Report on Form 10-K for the year ended December 31, 2019 filed with the U.S. Securities and Exchange Commission ("SEC") on March 16, 2020 (the "Original Filing") to amend Item 15 of Part IV of the Original Filing, pursuant to Rule 3-09 of Regulation S-X, to include the financial statements and related notes of Minera Santa Cruz S.A ("MSC"), a significant equity investee in which the Company holds a 49% equity ownership interest. In addition, the Company is filing the consent of the independent auditors and, as required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), new certifications by the Company's Chief Executive Officer and Chief Financial Officer.Rule 3-09 of Regulation S-X provides that if a 50%-or-less-owned person accounted for by the equity method meets the first or third condition of the significant subsidiary tests set forth in Rule 1-02(w) of Regulation S-X, substituting 20% for 10%, separate financial statements for such 50%-or-less-owned person shall be filed. These financial statements shall be prepared in accordance with accounting principles generally accepted in the United States of America ("US GAAP") or International Financial Reporting Standards ("IFRS"). MSC met the significant subsidiary test described above for the Company's fiscal years ending December 31, 2019, 2018 and 2017 and accordingly, the Company has included in this Amendment the required Statements of Financial Position as of December 31, 2019 and 2018, and the related Statements of Profit (Loss) and Other Comprehensive Profit (Loss), Changes in Equity, and Cash Flows for the years ended December 31, 2019, 2018 and 2017, and the accompanying Notes to the Financial Statements of MSC, prepared in accordance with IFRS. We caution readers that the MSC financial results included in our Annual Report on Form 10-K are presented in accordance with US GAAP and may therefore differ from the MSC results presented as separate financial statements reported under IFRS. No attempt has been made in this Amendment to modify or update the disclosures in the Original Filing except as required to reflect the effect of the revisions discussed herein. Except as otherwise noted herein, this Amendment continues to describe conditions as of the date of the Original Filing and the disclosures contained herein have not been updated to reflect events, results or developments that occurred after the date of the Original Filing, or to modify or update those disclosures affected by subsequent events. Among other things, forward-looking statements made in the Original Filing have not been revised to reflect events, results or developments that occurred or facts that became known to us after the date of the Original Filing, and such forward-looking statements should be read in conjunction with our filings with the SEC subsequent to the filing of the Original Filing. Accordingly, this Amendment should be read in conjunction with the Original Filing and the Company's other filings with the SEC subsequent to March 16, 2020. Furthermore, readers are cautioned to review the reliability of information disclosure, contained in our Annual Report on Form 10-K, pertaining to the disclosure of MSC results.
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 489,362,153
Entity Common Stock, Shares Outstanding		400,398,425
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Central Index Key	0000314203
Amendment Flag	true