Thunder Gold hits 121.5 m averaging 0.376 g/t Au in new target 200 m east of pit

Thunder Bay, Ontario--(Newsfile Corp. - September 17, 2026) - Thunder Gold Corp. (TSXV: TGOL) (FSE: Z25) (OTCQB: TGOLF) (" Thunder Gold " or the " Company ") is pleased to announce exploration diamond drill results from the Bench Target, at the Company's flagship Tower Mountain Property, 40 kilometres west of Thunder Bay, Ontario.

Highlights:

TM26-205 identified significant new mineralization east of the current resource pit limit;

All seven (7) holes intersected mineralization above the current resource cut-off grade in areas previously estimated to be waste;

Results demonstrate good to excellent correlation to the current resource model;

TM26-207 and TM26-207A provide twinned hole results indicating minimal variation (less than 5%) over the first 40 metres of both holes and;

TM26-213 intersected 287.7 metres averaging 0.223 g/t Au, extending the mineralized trend to the southeast.

Holes TM26-201, 205, 206, 207 and 208 were drilled perpendicular to the interpreted Tower Mountain Intrusive Complex (" TMIC ") contact probing the eastern extent of the variably brecciated and altered volcanic +/- intrusive horizon hosting the known gold mineralization of the Bench Target. This area was exclusively classified as waste in the 2026 Mineral Resource Estimate (" MRE ") due to lack of drill coverage.

Holes TM26-209 and TM26-213 were drilled sub-parallel to the interpreted TMIC contact.

Wes Hanson, President and CEO states, "With the exception of TM26-213, these holes all tested the 150 million tonnes of waste rock within the 2026 MRE pit shell that were not estimated due to insufficient drill coverage. All intervals above the MRE cut-off grade (0.19 g/t Au) offer potential to reduce the waste:ore strip ratio which is already amongst the lowest of our Canadian peer group. The targeted area represents 66% of the total waste