Marimaca Copper extends bornite zone at Pampa Medina: 6 m of 6.11% Cu

Investor Webinar to be held July 14, 2026 VANCOUVER, BC / ACCESS Newswire / July 7, 2026 / Marimaca Copper Corp. ("Marimaca Copper" or the "Company") (TSX:MARI)(ASX:MC2) is pleased to report additional assay results from ongoing step-out drilling at the Pampa Medina deposit, located approximately 28km east of the Company's Marimaca Oxide Deposit ("MOD") in Chile's Antofagasta Region. Results continue to extend the central high-grade sulphide zone and confirm multiple stacked manto-style copper-silver horizons across the sedimentary and volcanic sequence. Hole SPRD-07 extended the ultra-high-grade bornite zone 300m south of previously released drilling, returning 20m at 2.65% Cu and 13.9 g/t Ag from 564m, including 6m at 6.11% Cu and 24.0 g/t Ag, and 104m at 1.01% Cu and 4.7 g/t Ag from 664m, including 40m at 2.04% Cu and 11.1 g/t Ag.

Drilling in SPRD-08B also intersected mineralization in basement metasediments for the first time, indicating potential for depth extensions beyond the previously defined host units. The Company will also host an investor webinar presentation on Pampa Medina's exploration progress via Investor Meet Company on July 14, 2026. Further details are provided below.

The ongoing step-out program continues to support the geological model: multiple high-grade, stacked mantos with dominantly bornite-chalcocite mineralization hosted in interbedded sediments and volcaniclastics Drilling extended mineralization into the basement metasediments for the first time at Pampa Medina, with SPRD-08B being the deepest hole drilled to date to a depth of 1,052m Indicates potential for further extension at depth at Pampa Medina The nearby Cachorro discovery (Antofagasta Minerals) is primarily hosted in basement tuffs and metasediments (Figure 2) SPRD-07 - drilled 300m south of previously released SPRD-05 (Figure 4) - inters