High-Grade Sediment Hosted Mineralization Extended at Pampa Medina – 300m Western Step-out SMRD-16 Intersects 10m of 4.2% Cu within 70m of 1.0% Cu

VANCOUVER, British Columbia, Aug. 15, 2025 (GLOBE NEWSWIRE) -- Marimaca Copper Corp. (“Marimaca Copper” or the “Company”) (TSX:MARI, ASX:MC2) is pleased to announce further drilling at the Pampa Medina deposit, extending the high-grade sediment-hosted manto-system 300m to the west from previous drilling. Pampa Medina is located at low altitude approximately 28km east of the Company’s Marimaca Oxide Deposit (“MOD”) in a flat “pampa” valley within the Atacama Desert (Figure 1). The Company is executing a 10,000m extensional drilling program with three rigs currently on site.