Large Sediment a Volcanic Hosted Manto Copper System Across Pampa Medina Area

VANCOUVER - Marimaca Copper Corp. reported on the re-interpretation of data in the Pampa Medina Project Area which incorporates the Pampa Medina and Madrugador deposits and the newly identified Pampa West oxide zone, and is located approximately 25km from the Company’s flagship Marimaca Oxide Deposit (MOD).

The Company also announces results from five broad reconnaissance exploration holes, which were designed to identify the limits of the mineralized horizon. This drilling, when combined with the full review and relogging of historical drilling, shows consistent broad zones of oxide copper mineralization of variable grades in the same stratigraphic horizon over an area of approximately 5km by 4km, which is the current defined extent of the manto horizon. Potential exists for further extensions in all directions, with ongoing step out programs.

Based on the extensive work completed, including the new drilling results extending Pampa Medina, the Company believes that Pampa Medina may be the central part of a larger manto system. Based on these results, the Company will continue with its strategy of large-scale step-out holes from known mineralization, and deep sulphide-target drilling to try to identify the limits of the system.

Marimaca is considering alternatives for a significantly expanded program for the balance of 2025 to include both reverse circulation (“RC”) and diamond drilling. The objectives of this program will be to continue to step out to identify the limits of the system, to test the deeper units for primary copper mineralization and to delineate areas for potential extensions of near-surface oxide mineralization.

Sergio Rivera, VP Exploration, said, “Our extensive reviews of existing data, our geophysical campaigns and the results from our initial step out discovery campaign indicate Pampa Medina is likely to be part of a much larger manto system, which extends at least 5km east to west and more than 4km north and south. As with all large-scale mineralizing systems, there is zonation and variability of grade, but we are excited about both the continuity of mineralization in the productive sedimentary and tuff horizons and the large-scale mineralizing events which have impacted them across this area.

“The significant east-west step outs at Pampa Norte, either side of the fantastic drill hole at SMR-01, encountered offset faulting and a series of barren dykes, which are important controls of mineralization. However, we can now clearly see the potential for 1,000m of east-west extent of the mineralized envelope for Pampa Medina, which becomes important for resource growth potential in future programs.

“Our exploration model, which hypothesised that the majority of the historical drilling was not deep enough to targeting the productive sedimentary units, has been confirmed and we see numerous opportunities for further discovery and extension from our existing deposits.”