Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	Mar. 01, 2020	Jun. 30, 2019
Details
Registrant CIK	0000711034
Fiscal Year End	--12-31
Registrant Name	Thunder Mountain Gold Inc
SEC Form	10-K
Period End date	Dec. 31, 2019
Trading Symbol	THMG
Trading Exchange	NONE
Tax Identification Number (TIN)	91-1031015
Number of common stock shares outstanding		60,145,579
Public Float			$ 2,597,392
Filer Category	Non-accelerated Filer
Current with reporting	Yes
Interactive Data Current	Yes
Voluntary filer	No
Well-known Seasoned Issuer	No
Shell Company	false
Small Business	true
Emerging Growth Company	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, Postal Zip Code	83713
Entity Address, City or Town	Boise
Entity Address, State or Province	ID
City Area Code	208
Local Phone Number	658-1037
Title of 12(g) Security	Common Stock, $0.001 par value
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Document Annual Report	true
Document Transition Report	false