Document and Entity Information	9 Months Ended
	Sep. 30, 2017 shares
Document and Entity Information
Entity Registrant Name	Thunder Mountain Gold Inc
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Amendment Flag	false
Entity Central Index Key	0000711034
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Entity Common Stock, Shares Outstanding	55,095,579
Entity Incorporation, Date of Incorporation	Nov. 09, 1935
Trading Symbol	thmg