Pampa Medina drills 16m of 5.70% Cu, 62.6 g/t Ag at UHG Bornite Zone

VANCOUVER, BC / ACCESS Newswire / June 8, 2026 / Marimaca Copper Corp. ("Marimaca Copper" or the "Company") (TSX:MARI)(ASX:MC2) is pleased to report additional assay results from its ongoing drilling program at the Pampa Medina deposit, located at low altitude approximately 28km east of the Company's Marimaca Oxide Deposit ("MOD") (Figure 1) in Antofagasta Region, Chile. Drilling completed on 150m centres continues to demonstrate continuity of ultra-high-grade copper-silver mineralization across the central zone of the Pampa Medina deposit, with SPRD-05 intersecting 96m at 1.19% Cu and 11.7g/t Ag, including 16m at 5.70% Cu and 62.6g/t Ag and 4m at 11.32% Cu and 144g.0/t Ag. The sediment-hosted system is demonstrating strong lateral continuity across the initially defined 3km x 1.5km area of interest ("AOI"), reinforcing the significant scale of the deposit.

High-grade sulphide mantos show strong lateral continuity across the defined AOI, with 150m-spaced delineation drillholes continuing to intersect high grades (>2% Cu) over significant widths in dominantly bornite and chalcocite SPRD-05 - drilled east of previously released hole SPRD-06 - intersected the ultra-high grade (UHG) bornite manto at depth in sediments and tuffs 96m of 1.19% Cu and 11.7g/t Ag from 692m (sulphide), including 60m of 1.80% Cu and 18.4g/t Ag from 694m, including 16m of 5.70% Cu and 62.6g/t Ag from 704m, including 4m of 11.32% Cu and 144.0g/t Ag from 706m Details of lithology and grade across the broader intersection are shown in Figure 6 Represents one of the strongest bornite-mineralized manto intersections to date at Pampa Medina Near surface oxide mineralization also intersected in volcanics and sediments north of the historic Pampa oxide footprint 22m of 0.40% Cu and 1.9g/t Ag from 60m (oxide) 24m of 0.30% Cu and 1.8g/t Ag from