Document And Entity Information	12 Months Ended
	Dec. 31, 2024 shares
Document Information [Line Items]
Entity Central Index Key	0001230992
Entity Registrant Name	MAG SILVER CORP
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2024
Document Type	40-F
Document Registration Statement	false
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
Entity File Number	001-33574
Entity Incorporation, State or Country Code	A1
Entity Address, Address Line One	815 Hastings Street West, Suite 801
Entity Address, City or Town	Vancouver
Entity Address, State or Province	BC
Entity Address, Postal Zip Code	V6C 1B4
City Area Code	604
Local Phone Number	630-1399
Title of 12(b) Security	Common Shares, without par value
Trading Symbol	MAG
Security Exchange Name	NYSE
Annual Information Form	true
Audited Annual Financial Statements	true
Entity Common Stock, Shares Outstanding	103,357,295
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Auditor Name	Deloitte LLP
Auditor Location	Vancouver, Canada
Auditor Firm ID	1208
Business Contact [Member]
Document Information [Line Items]
Entity Address, Address Line One	850 Library Avenue, Suite 204
Entity Address, City or Town	Newark
Entity Address, State or Province	DE
Entity Address, Postal Zip Code	19711
City Area Code	302
Local Phone Number	738-6680
Contact Personnel Name	Puglisi & Associates