Marimaca Copper: Extends High-Grade Oxide Mineralization at Mercedes Target & Advances Towards ASX Listing

• Drilling at the Mercedes target has extended the shallow oxide copper mineralization envelope to an area measuring 700 meters along strike and 400 meters in width. This drilling campaign confirms the continuity and scale of the near-surface copper oxide mineralization at Mercedes.
• The drilling results are highlighted by hole MER-25, which intersected 68 meters grading 0.64% total copper (CuT) starting from just 8 meters downhole depth, including a higher-grade zone of 42 meters at 0.90% CuT.
• The new drilling results complement the historical drilling at Mercedes, which also encountered broad zones of oxide copper near surface, including 86 meters grading 0.44% CuT in hole MER-12. Together, the new and historical holes confirm the consistency of the oxide mineralization across the target area.
• In addition to the main mineralized zones, a lower-grade halo extends the area of interest at Mercedes and provides strong potential to add additional leachable copper resources to the overall inventory.
• Marimaca Copper has initiated the process to dual list on the Australian Securities Exchange (ASX) alongside its current Toronto Stock Exchange (TSX) listing to access a deeper pool of capital and advance its flagship Marimaca copper project in Chile to attract institutional investors and fund the next stages of development.

Marimaca Copper Corp. (TSX:MARI) is a copper exploration and development company focused on its flagship Marimaca Oxide Deposit ("MOD") located in the Antofagasta region of Chile. The MOD represents one of the most significant copper oxide discoveries in Chile in the last decade. Marimaca Copper aims to rapidly advance the project through the permitting and definitive feasibility stages towards development of this high-margin, low capital intensity project in a tier-1 mining jurisdiction.

Mercedes Drilling Highlights

The Company completed 8 reverse circulation (RC) drill holes for 2,200m at the Mercedes target, located less than 500m north of the MOD, with the objective of extending the mineralized envelope. Six of the eight holes intersected broad zones of copper oxide mineralization starting at or near surface:

• MER-25: 68m at 0.64% CuT from 8m, including 42m at 0.90% CuT
• MER-20: 86m at 0.21% CuT from 18m, including 20m at 0.50% CuT
• MER-18: 46m at 0.20% CuT from 4m, including 10m at 0.36% CuT

The drilling has defined an area of interest of 700m along strike by 400m width to a depth of 100m. Importantly, a lower grade halo to the east and southeast materially extends the footprint. The oxide mineralization at Mercedes, hosted in the same intrusives as the MOD, is structurally controlled by pervasive fracturing.

Potential to Extend Mine Life

The shallow, higher-grade oxide copper intersected at Mercedes provides strong potential to add leachable resources to extend the mine life of the MOD. Sergio Rivera, VP Exploration, commented:

"Mercedes appears to be a mineralizing system of some scale and we are especially pleased with the continuity of grades in the north-western and western peripheries of the area of interest. The lower grade halo is reminiscent of the boundaries of the MOD, and we continue to see potential to add complementary, shallow, oxide resources to our mineral inventory."

The northwest portion of Mercedes has an intersection with weighted average grade approaching the life-of-mine grade expected for the MOD. Over the entire 700m by 400m area, the drilling averages nearly 0.35% CuT, well above anticipated economic cut-off grades. Marimaca Copper sees clear potential for Mercedes to extend the MOD's mine life with further work.

Next Steps

With the encouraging results from Mercedes, Marimaca Copper has now shifted its exploration focus to:

1. Drilling the greenfields Sierra de Medina target
2. Follow-up drilling along strike from the recently acquired Pampa Medina deposit
3. Completing a resource estimate and preliminary economic assessment for Pampa Medina

Marimaca is systematically exploring and drilling satellite targets within a 5km radius of the MOD, each providing an opportunity to add shallow, oxide resources to the flagship development project.

ASX Dual Listing

In addition to the Mercedes news, Marimaca Copper also announced it has initiated the process to dual list on the Australian Securities Exchange (ASX). Key points:

• ASX listing is part of Marimaca's growth strategy to advance its Chile copper project
• Will provide access to a deeper pool of institutional capital with strong appetite for copper projects
• Important milestone as Marimaca advances through DFS, permitting and towards development
• Listing is not guaranteed and remains subject to ASX approval

CEO Hayden Locke remarked:

"The ASX listing, in addition to the TSX listing, will provide the Company with greater access to a deeper pool of institutional capital, where there is also a strong appetite for high quality copper development and exploration projects. This naturally becomes increasingly important in the near term as the Company considers its financing strategy for future development."

The ASX dual listing diversifies Marimaca's access to growth capital as it advances its flagship oxide copper project through key development milestones. The ASX has a strong base of resource-focused investors with an appetite for high-quality copper assets like Marimaca.

Conclusion

The latest drilling results from Mercedes continue to demonstrate the potential to add shallow, leachable oxide copper resources nearby the flagship Marimaca deposit. With oxide mineralization extended to a 700m by 400m area of interest and high-grade continuity confirmed, Mercedes looks to be a mineralizing system of scale that could meaningfully extend the mine life of the MOD.

Marimaca Copper remains laser-focused on systematically exploring its regional land package to grow resources while in parallel advancing the MOD through permitting, DFS and towards development. The initiation of an ASX dual listing process diversifies access to growth capital and institutional investors as Marimaca looks ahead to financing the construction of Chile's next copper mine.

For investors bullish on long-term copper fundamentals and seeking exposure to a well-managed company with a marquee oxide development project and exciting regional exploration upside, Marimaca Copper presents a compelling opportunity. News flow should remain strong as the Company delivers drill results from satellite targets, executes on the dual listing, and advances the Marimaca project towards production.