Marimaca Copper Confirms High-Grade Continuity at Pampa Medina

Exceptional Thickness and Grade Confirmed in Step-Out Drilling

Marimaca Copper Corp (ASX:MC2) has delivered another strong set of assay results from its 2026 step-out drilling program at the Pampa Medina deposit in Chile. The standout is hole SPRD-06, which intersected an extraordinary 424 metres averaging 0.58% copper and 2.2 g/t silver, containing five vertically stacked high-grade mantos. These mantos include intervals of up to 2.54% Cu and 21 g/t Ag, demonstrating both significant thickness and grade continuity in a sediment-hosted copper system that now spans an initial 3km by 1.5km area.

The presence of multiple stacked mantos is a notable geological feature distinguishing Pampa Medina from other global sedimentary copper deposits such as Kupferschiefer and Kamoa-Kakula. This thick mineralized package, exceeding 400 metres in some holes, underlines the deposit’s district-scale potential and the robustness of Marimaca’s geological model.

Expanding the Mineralized Horizon with Consistent High Grades

Step-out drilling on 150-metre spacing continues to expand the known mineralized sedimentary horizon. For example, SPRD-02 and SWRD-05 holes, drilled 300 metres apart from previous holes, returned broad high-grade intercepts including 166m at 0.50% Cu and 3.9 g/t Ag and 30m at 1.00% Cu and 7.3 g/t Ag respectively. These results confirm continuity not only in the central high-grade zone but also towards the south-western extensions, reinforcing the deposit’s scale beyond initial scouting.

Drilling has identified consistent mineralization in both oxide and sulphide zones, with elevated silver grades generally correlated with copper. The oxide zones, dominated by minerals such as atacamite and chrysocolla, extend from near surface, while sulphide zones featuring bornite and chalcopyrite extend at depth beyond the oxide-primary transition. This dual mineralization style offers potential flexibility for future processing strategies.

Quality Assurance and Geological Confidence

The drilling and sampling program adheres to rigorous QA/QC protocols, including continuous 2-metre sampling intervals, certified laboratory assays by Andes Analytical Assay Ltd, and comprehensive data verification under the supervision of Sergio Rivera, Marimaca’s VP Exploration. True widths are conservatively estimated at 80-90% of reported downhole lengths, and the geological logging and structural measurements support the interpretation of sub-perpendicular drill orientations relative to mineralized mantos.

These robust technical practices underpin the company’s confidence in the geological model and the emerging scale of the Pampa Medina system, which Marimaca acquired and reinterpreted in 2024. The updated model prioritizes lower sedimentary units as key target horizons, guiding the current drilling campaign’s focus on defining the high-grade central zone and testing lateral and depth extensions.

Strategic Positioning Amid Strong Financial Backing

This drilling success comes on the back of Marimaca Copper’s strengthened balance sheet following a C$409 million equity raise earlier in May 2026, which boosted cash reserves to nearly C$148 million. The ample funding supports the ongoing aggressive exploration and development activities at Pampa Medina and the broader Marimaca Project in Chile, positioning the company well to advance towards resource delineation and potential development milestones. The current results build on the company’s earlier high-grade expansions reported in March 2026, underscoring a sustained momentum in exploration progress.

Marimaca’s approach to systematically expanding and confirming Pampa Medina’s mineralization footprint, combined with strong financial resources, marks it as a copper project of growing significance in the region.