Pampa Medina Drilling Continues to Validate Sedimentary-Hosted Copper Manto Model
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On November 11, 2025, Marimaca Copper announced the final assay results from its successful 10,000-metre discovery drilling campaign at the Pampa Medina Project. The results continue to validate the company's sedimentary-hosted copper model. Highlights include significant oxide intercepts such as 160 metres of 0.92% copper in hole SMRD-22 and high-grade sulphide intercepts like 28 metres of 1.44% copper in hole SMR-19.
Concurrent with releasing these positive final results, the company announced the immediate commencement of a much larger 30,000-metre Phase II drilling program. This new program, utilizing five drill rigs, will focus on step-out drilling to test the northern and western extensions of the mineralization.
This news was released on the same day the company announced it had received the main environmental approval (RCA) for its flagship Marimaca Oxide Deposit (MOD).
The news is material and positive. While the drill results are excellent and in line with previous high-grade intercepts at Pampa Medina, the key takeaway is the validation of the exploration model and the aggressive transition to a large-scale, 30,000-metre Phase II program.
- Confirmation of Growth Thesis: These results provide the final confirmation from the initial discovery program, solidifying Pampa Medina as a significant new copper deposit. This is no longer a geological concept; it's a deposit with demonstrated scale and grade that provides a clear growth path beyond the initial MOD mine plan outlined in the Definitive Feasibility Study (DFS).
- Strategic Execution: The immediate launch of a 30,000-metre program demonstrates management's confidence and commitment to aggressively defining the full extent of the Pampa Medina system. This is a direct deployment of the capital raised in the A$80 million financing in September 2025, showing the company is executing its stated strategy.
- Synergistic De-risking: When viewed in the context of the environmental approval for the MOD announced the same morning, the impact is magnified. The company has simultaneously achieved a critical de-risking milestone for its base-case project (MOD) while confirming and expanding its high-impact growth project (Pampa Medina). This dual-track progress is what investors look for: a solid foundation with significant, tangible upside.
- Alignment with Projections: The drilling success aligns perfectly with the company's narrative since the initial Pampa Medina discovery in late 2024. Management paused the Pampa Medina PEA in July 2025 because the drilling was so successful it was changing the potential scale of the project. This new, larger program is the direct consequence of that success and reinforces the decision to aim for a larger-scale development concept.
In isolation, the drill results are a routine positive step in a successful exploration campaign. However, the commitment to a 30,000-metre follow-up, funded by the recent large financing and announced alongside the critical MOD environmental permit, makes the collective impact material and highly positive. It signals a company that is fully funded, permitted for its initial mine, and aggressively pursuing a district-scale copper opportunity.
Marimaca Copper Corp. is a copper exploration and development company focused on its assets in the Antofagasta region of Chile. Its flagship project is the 100%-owned Marimaca Oxide Deposit (MOD), a near-surface, heap-leachable copper project. The company recently completed a positive Definitive Feasibility Study (DFS) for the MOD, outlining a 13-year mine life producing an average of 43,000 tonnes of copper cathode per year with low capital intensity and robust economics. The company is also aggressively exploring its extensive land package, with a particular focus on the Pampa Medina project, located 28km from the MOD, which is emerging as a significant satellite deposit with district-scale potential.