Meridian Mining Expands Upside Potential at Santa Helena With the Discovery of a Second Layer of Gold-Silver and Zinc-Lead VMS Mineralisation

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Highlights:  Santa Helena expansion programme discovers a second Au-Ag & Zn-Pb system of VMS mineralisation; New VMS layer of Au-Ag & Zn-Pb mineralisation intercepted below and east of Santa Helena Central resource— CD-869 returns 7.2m @ 1.4g/t Au, 0.1% Cu, 24.3g/t Ag, 2.3% Zn, 0.9% Pb;— First appearance of visible gold hosted within the Santa Helena area mineralisation; — CD-869 interpreted as the down-dip extension of Santa Helena North IP anomaly; — Mineralisation remains open;  Exploration drill programmes for further multiple stacked horizons hosted within the Santa Helena VMS system continue; — Programme to test for both open pit and underground extensions to CD-869. London, United Kingdom--(Newsfile Corp. - June 17, 2026) - Meridian Mining plc (LSE: MNO) (TSX: MNO) (FSE: N2E0) (Tradegate: N2E0) (OTCQX: MRRDF) ("Meridian" or the "Company") is pleased to report that its ongoing drill programme targeting the Santa Helena VMS system has intercepted a new VMS layer of strong precious and base metal mineralisation. CD-869 returned a 7m-wide zone of gold-silver and zinc-lead dominated mineralisation including an interval containing visible gold. This new layer of Au-Ag & Zn-Pb mineralisation is located below and east of the Santa Helena Central resource. The zone is interpreted to represent the down-dip projection of the Santa Helena North chargeability anomaly. CD-869 returned 7.2m @ 1.4g/t Au, 0.1% Cu, 24.3g/t Ag, 2.3% Zn, 0.9% Pb from 177.6m, highlighting the prospectivity of the down-dip and down-plunge extensions of Santa Helena North's surface geophysical and geochemical anomalies. The Au-Ag and Zn-Pb mineralisation remains open and follow-up drilling continues. Mr. Gilbert Clark, CEO, comments: "CD-869's discovery of a second layer of strong precious and base metal mineralisation at Santa Helena presents an exciting opportunity for Meridian's shareholders. The potential of further resource growth is enhanced as is the future installation of a second hub1 along the Cabaçal Belt. CD-869 and the recently reported CD-852 at Álamo2 both intercepted gold-rich mineralisation. CD-869's visible gold is an attribute rarely seen at Santa Helena, and this may signal an additional structural gold overprint or gold-enriched VMS mineralisation like that seen at Cabaçal3. Following the London IPO, our well-funded expl...

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