| Document and Entity Information Document | Apr. 15, 2022 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Creation Date | Apr. 15, 2022 |
| Document Period End Date | Apr. 15, 2022 |
| Amendment Flag | false |
| Entity Registrant Name | Thunder Mountain Gold, Inc. |
| Entity Address, Address Line One | 11770 W. President Drive, Ste. F |
| Entity Address, City or Town | Boise |
| Entity Address, State or Province | ID |
| Entity Address, Country | US |
| Entity Address, Postal Zip Code | 83713 |
| Entity Incorporation, State Country Name | ID |
| City Area Code | 208 |
| Local Phone Number | 658-1037 |
| Entity File Number | 001-08429 |
| Entity Central Index Key | 0000711034 |
| Entity Emerging Growth Company | false |
| Entity Tax Identification Number | 91-1031015 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(g) Security | Common Stock, $0.001 par value |
| Former Address [Member] | |
| Document Information [Line Items] | |
| 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, Country | US |
| Entity Address, Postal Zip Code | 83713 |
