Marimaca Copper Reports High-Grade Silver Assays from Consolidated Pampa Medina Drill Results

Company Overview

Marimaca Copper Corp. [TSX: MARI | ASX: MC2] is a copper company focused on the development of high-quality copper assets in northern Chile. The company's flagship asset is the Marimaca Oxide Deposit (MOD), located in Chile's Antofagasta region, with the potential to produce 50,000 tonnes per year starting within the next three years. It is one of the few globally significant greenfield copper discoveries made in the last decade. The company controls additional exploration properties at Pampa Medina and Madrugador within the Sierra de Medina region, located 25 kilometres from the MOD, where recent drilling has identified both oxide extensions and high-grade sulphide mineralisation at depth.

Silver Assaying Completed Across Full Drill Database

Marimaca Copper has completed Inductively Coupled Plasma (ICP) assaying on all drilling conducted to date at Pampa Medina, releasing the full silver results alongside a consolidation of all drill results to date. Silver mineralisation is consistent across the deposit and broadly correlated with copper grades throughout the system. This presence has the potential to function as a by-product credit. Such by-products are common in Chilean manto-type deposits, including the nearby Mantos Blancos deposit operated by Capstone Copper and the Cachorro deposit held by Antofagasta Minerals. The company has not yet completed its Phase I metallurgical programmes and is therefore not reporting copper equivalent grades at this time.

Drill Highlights

All copper assays for the holes below have been previously reported.

The drilling results returned 6 metres at 11.98% copper and 82.0 grams per tonne silver from 594 metres downhole, within a broader 26 metres at 4.07% copper and 25.3 grams per tonne silver from 580 metres, itself within 100 metres at 1.28% copper and 6.9 grams per tonne silver from 580 metres.

Another drilling result returned 18 metres at 5.11% copper and 53.4 grams per tonne silver from 320 metres, within 102 metres at 1.20% copper and 12.2 grams per tonne silver from 250 metres, including 56 metres at 2.05% copper and 22.0 grams per tonne silver from 296 metres. A separate interval of 14 metres at 0.82% copper and 12.3 grams per tonne silver was also returned from 408 metres.

A further drilling result  returned 242 metres at 0.65% copper and 6.8 grams per tonne silver, including 20 metres at 2.25% copper and 25.9 grams per tonne silver from 298 metres and 32 metres at 1.03% copper and 12.0 grams per tonne silver from 332 metres. A further interval of 22 metres at 1.70% copper and 15.1 grams per tonne silver was returned from 604 metres.

Additional drilling results returned broad mineralised intervals with consistent silver credits, further reinforcing the continuity of the system. Selected highlights include 10 metres at 4.24% copper and 37.8 grams per tonne silver from 438 metres, 74 metres at 1.62% copper and 11.9 grams per tonne silver from 162 metres, and 6 metres at 2.09% copper and 46.0 grams per tonne silver from 374 metres..

Deposit Geology

Pampa Medina is a manto-style copper deposit, a layered, flat-lying style of mineralisation common in northern Chile, hosted in ancient sedimentary and volcanic rock units. Copper mineralisation was first identified near the surface in oxide form and has since been traced at depth into higher-grade sulphide zones. Elevated silver values are present across both the near-surface oxide and deeper sulphide zones, and are correlated with copper grade throughout the deposit.

Next Steps

Drilling is ongoing at Pampa Medina with five rigs currently on site. The company intends to increase the rig count over the course of April and May to accelerate the 2026 drilling programme. The campaign is focused on three priorities: definition of the high-grade sulphide-dominant central zone, delineation of identified oxide extensions, and further step-out drilling to test potential extensions of the broader system, with a particular focus on extensions to the west, north-west, and north-east. Phase I metallurgical programmes at Pampa Medina have not yet been completed. 

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