Metalsource Mining intercepts silver to 335 m below surface

55 metre away down plunge drilling step out returns multiple intervals within mineralized zones up to 15.3 metres wide as drilling continues to expand known mineralization and refine targeting toward higher grade zones.

Vancouver, British Columbia--(Newsfile Corp. - August 18, 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 step out drilling continues to improve management's understanding of the continuity and orientation of a growing high grade polymetallic system.

Hole SH26-20 returned 9.57 metres grading 364 g/t silver equivalent ("AgEq"), including 2.26 metres grading 913 g/t AgEq.

Hole SH26-21 returned 15.3 metres grading 207 g/t AgEq, including 2.4 metres grading 515 g/t AgEq.

These two holes continue to demonstrate mineralization is open at depth, with reliable widths and high grades, validating the company's interpretation that the system remains open down dip and along strike to the north and south.

SH26-20: This hole was drilled as a follow up to SH26-19, designed to characterize the grade of lost material in SH26-19. This is very important for data continuity in future resource estimations. SH26-20 returned composite values of up to 8.4 g/t gold, with 47.9 g/t silver, and 14.7% combined lead-zinc. The combined result of SH26-19 and SH26-20 demonstrate local variability in grade along strike and down dip can be significant. This result bolsters our confidence that an individual intercept of relative lower grade can be in very close proximity to high grade mineralization.

SH26-21: This hole was drilled as a down dip step out below SH26-20, and returned higher overall composite lead values, including up to 7.3% lead and 47 g/t silver. Elevated silver with higher lea