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

The most recent news (April 2, 2026) reports the completion of silver assaying for the Pampa Medina deposit. Key findings include a strong correlation between high-grade copper and silver mineralization across a 3km x 2km area. Notable intercepts include 6m at 11.98% Cu with 82g/t Ag and 18m at 5.11% Cu with 53.4g/t Ag. While copper-equivalent (CuEq) grades are not yet reported due to pending metallurgical work, the pervasive nature of silver in both oxide and sulphide zones suggests significant by-product potential. Consequently, the company is increasing its rig count to accelerate the 2026 drilling program.

The impact is Routine - Positive. While the grades are exceptional, the market was already aware of the high-grade copper at Pampa Medina from the March 11, 2026, release. The confirmation of silver as a consistent by-product is a positive incremental development that will likely enhance the eventual Mineral Resource Estimate (MRE) and project economics (potentially via a silver stream), but it does not fundamentally change the project's scope beyond what was signaled in the aggressive 100,000m drill plan announced weeks prior. The news validates the "sediment-hosted" model which typically carries precious metal by-products.

Marimaca Copper is focused on the Marimaca Oxide Deposit (MOD) in Antofagasta, Chile. - Flagship (MOD): A low-capital intensity project with a 2025 DFS showing a US$709M post-tax NPV (8%) and 31% IRR at $4.30 Cu. It targets 50ktpa of copper cathode via heap leaching. - Growth Project (Pampa Medina): A newer, high-grade sediment-hosted manto discovery located 28km from MOD, currently undergoing a 100,000m drill program to define a maiden resource.