Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2025	Apr. 21, 2025
Document Information [Line Items]
Registrant Name	THUNDER MOUNTAIN GOLD, INC.
Registrant CIK	0000711034
Fiscal Year End	--12-31
SEC Form	10-Q
Period End date	Mar. 31, 2025
Tax Identification Number (TIN)	91-1031015
Number of common stock shares outstanding		73,255,579
Filer Category	Non-accelerated Filer
Current with reporting	Yes
Interactive Data Current	Yes
Shell Company	false
Small Business	true
Emerging Growth Company	false
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-08429
Entity Incorporation, State or Country Code	NV
Entity Address, Address Line One	11770 W President Dr. STE F
Entity Address, City or Town	Boise
Entity Address, State or Province	ID
Entity Address, Postal Zip Code	83713-8986
City Area Code	208
Local Phone Number	658-1037
Amendment Flag	false
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q1
ExchangeTSXV [Member]
Document Information [Line Items]
Trading Symbol	THM
Trading Exchange	NONE
Title of 12(g) Security	Common Stock, $0.001 par value
Exchange OTCQB [Member]
Document Information [Line Items]
Trading Symbol	THMG
Trading Exchange	NONE
Title of 12(g) Security	Common Stock, $0.001 par value