Mineral Interest Commitments (Narrative) (Details)				6 Months Ended	9 Months Ended
Mineral Interest Commitments (Narrative) (Details)	Jun. 02, 2025 USD ($) a	Oct. 24, 2008 USD ($)	Jun. 20, 2008 USD ($) a	Jun. 30, 2025 USD ($) a	Sep. 30, 2025 a	Oct. 24, 2028 a	Feb. 01, 2023
Other Commitments [Line Items]
Lease contract							2 years
Lease renewal term							24 months
Ronald Acree [Member]
Other Commitments [Line Items]
Lease contract			6 years
Area of land \| a			113	113
Annual committed lease payments per acre per original agreement for six year term			$ 20
Lease renewal term			10 years	10 years
Annual Committed Lease Payments Per Acre			$ 30
Adjusted annual lease payment per acre			50	$ 50
Adjusted annual lease payment per acre thereafter			$ 75
Increase in annual lease payment in seventeenth anniversary				$ 5,650
William And Nita Lowry [Member]
Other Commitments [Line Items]
Lease contract						6 years
Area of land \| a						376
Annual committed lease payments per acre per original agreement for six year term		$ 20
Lease renewal term						10 years
Annual Committed Lease Payments Per Acre		$ 30
Kevin and Jo Lootens Living Trust [Member]
Other Commitments [Line Items]
Lease contract	7 years
Area of land \| a	18
Annual committed lease payments per acre per original agreement for six year term	$ 30
Lease renewal term	10 years
Annual Committed Lease Payments Per Acre	$ 40
Trout Creek [Member]
Other Commitments [Line Items]
Number of unpatented claims					26
Area of land \| a					533
South Mountain-BLM [Member]
Other Commitments [Line Items]
Number of unpatented claims					34

THUNDER MOUNTAIN GOLD INC 10-Q