Meridian drills stacked Au-Cu-Ag and Zn-Pb VMS at Santa Helena

Highlights:

Lower zone of multiple stacked layers of Au-Cu-Ag & Zn-Pb VMS mineralisation drilled at Santa Helena; — CD-878’s upper layer drills 11.3m @ 0.8g/t Au, 0.2% Cu, 17.6g/t Ag, 3.4% Zn & 0.6% Pb; - Including 4.4m @ 1.7g/t Au, 0.1% Cu, 32.1g/t Ag, 5.8% Zn, 1.4% Pb;

Strong gold and silver VMS mineralisation including visible gold within an 11.3m interval; — Peak precious metal assays of 7.31g/t Au, 71.7g/t Ag;

CD-878’s lower layer intercepts copper-dominant VMS mineralisation: — 1.7m @ 0.9% Cu, 0.1g/t Au, and 8.3g/t Ag, 13.6m below CD-878 main horizon;

Mineralisation remains open in all directions;

Santa Helena’s exploration drilling continues to target further near-mine upside; and

Meridian’s first reconnaissance programmes across the highly prospective Jauru and Araputanga portfolio of exploration licences have begun.

London, United Kingdom--(Newsfile Corp. - August 11, 2026) - Meridian Mining plc (LSE: MNO) (TSX: MNO) (FSE: N2E0) (Tradegate: N2E0) (OTCQX: MRRDF) ("Meridian" or the "Company") is pleased to report that it has drilled multiple stacked layers of Au-Cu-Ag & Zn-Pb VMS mineralisation below Santa Helena, further extending the limits of mineralisation 1 . Santa Helena is located 10km south-east of the advanced Cabaçal gold-copper-silver project located in Mato Grosso, Brazil 2 . CD-878 returned 11.3m @ 0.8g/t Au, 0.2% Cu, 17.6g/t Ag, 3.4% Zn & 0.6% Pb from 199.8m, including an interval containing visible gold. CD-878 then intercepted a lower layer of copper-dominant VMS mineralisation returning 1.7m @ 0.9% Cu , 0.1g/t Au and 8.3g/t Ag. CD-878's upper zone is interpreted as a 90m down-dip "widening extension" to the previously reported CD-869 intersection of 7.2m @ 1.4g/t Au, 0.1% Cu, 24.3g/t Ag, 2.3% Zn & 0.9% Pb. Drilling across the greater Santa Helena system continues. In addition, the first reconnaissance program