Metalsource Mining extends mineralization at depth, Silver Hill enters major expansion

Holes SH26-22 and SH26-23 return up to 930 g/t AgEq within broader mineralized horizons as ongoing step out drilling expands Silver Hill and the Company prepares for significantly larger step outs along strike

Vancouver, British Columbia--(Newsfile Corp. - September 16, 2026) - Metalsource Mining Inc. (CSE: MSM) (OTCQB: MSMMF) (FSE: E9Z) ("Metalsource" or the "Company") is pleased to announce additional assay results from its ongoing drill program at Silver Hill, where deep drilling continues to improve management's understanding of the high grade polymetallic system. Hole SH26-22 returned 7.32 metres grading 261 g/t silver equivalent ("AgEq"), including 1.37 metres grading 930 g/t AgEq from 245.67m. Hole SH26-23 returned 12.31 metres grading 140 g/t AgEq, including 1.86 metres grading 833 g/t AgEq from 246.8m.These two holes continue to demonstrate mineralization at depth, with reliable widths and high grades. SH26-06 returned minimal base metals, but identified multiple mineralized intervals containing gold (Au), including 0.4m of 3.1 g/t Au from 119.30m. Both holes intersected higher grade mineralization within broader mineralized horizons at depth, providing additional geological information as Metalsource continues step out drilling and prepares to significantly expand exploration along strike.

Ongoing drilling is currently stepping out from the known Silver Hill mineralization to test its continuation into previously untested ground. Building on this work, Metalsource is preparing a subsequent phase of significantly larger step outs to the north and south designed to test the broader strike potential of the mineralization. In parallel, expanded drilling capacity will allow the Company to begin testing priority IP anomalies beyond the historic mine footprint, several of which exhibit geophysical characteristics similar to those associated wit