Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2024	Feb. 15, 2025	Jun. 28, 2024
Document Information [Line Items]
Registrant Name	THUNDER MOUNTAIN GOLD, INC.
Registrant CIK	0000711034
Fiscal Year End	--12-31
SEC Form	10-K/A
Period End date	Dec. 31, 2024
Tax Identification Number (TIN)	91-1031015
Number of common stock shares outstanding		73,255,579
Public Float			$ 1,110,787.44
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
Amendment Description	§240.12b–15 Amendments. All amendments must be filed under cover of the form amended, marked with the letter ‘‘A’’ to designate the document as an amendment, e.g., ‘‘10– K/A,’’ and in compliance with pertinent requirements applicable to statements and reports. Amendments filed pursuant to this section must set forth the complete text of each item as amended. Amendments must be numbered sequentially and be filed separately for each statement or report amended. Amendments to a statement may be filed either before or after registration becomes effective. Amendments must be signed on behalf of the registrant by a duly authorized representative of the registrant. An amendment to any report required to include the certifications as specified in §240.13a–14(a) or §240.15d–14(a) must include new certifications by each principal executive and principal financial officer of the registrant, and an amendment to any report required to be accompanied by the certifications as specified in §240.13a– 14(b) or §240.15d–14(b) must be accompanied by new certifications by each principal executive and principal financial officer of the registrant. An amendment to any report required to include the certifications as specified in §240.13a–14(d) or §240.15d–14(d) must include a new certification by an individual specified in §240.13a–14(e) or §240.15d–14(e), as applicable. The requirements of the form being amended will govern the number of copies to be filed in connection with a paper format amendment. Electronic filers satisfy the provisions dictating the number of copies by filing one copy of the amendment in electronic format. See §232.309 of this chapter (Rule 309 of Regulation S-T).
Document Annual Report	true
Document Transition Report	false
Document Financial Statement Error Correction [Flag]	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
City Area Code	208
Local Phone Number	658-1037
Amendment Flag	true
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Auditor Name	Assure CPA, LLC
Auditor Location	Spokane, Washington
Auditor Firm ID	444
ICFR Auditor Attestation Flag	false
ExchangeTSXV
Document Information [Line Items]
Trading Symbol	THM
Trading Exchange	NONE
Title of 12(g) Security	Common Stock, $0.001 par value
Exchange OTCQB
Document Information [Line Items]
Trading Symbol	THMG
Trading Exchange	NONE
Title of 12(g) Security	Common Stock, $0.001 par value