Marimaca Copper (TSX:MARI) is undertaking further drilling at the Pampa Medina deposit in Chile, extending the “high-grade” sediment-hosted manto-system 300m to the west from previous drilling.
Pampa Medina is located at low altitude 28km east of the company’s Marimaca Oxide deposit (MOD) in a flat “pampa” valley within the Atacama Desert.
The company is undertaking a 10,000m extensional drilling program with three rigs currently on site.
Pampa Medina is a stratiform or manto-style copper deposit dominantly hosted in Jurassic-Triassic sedimentary units (sandstones, conglomerates, tuffs and black shales) overlain by andesitic volcanics and underlain by an Upper Paleozoic complex of metamorphosed sediments, volcanics and intrusions.
Copper was originally identified in near-surface oxide mineralisation dominated by atacamite, chrysocolla and both secondary and primary chalcocite, and has now been identified in ‘high-grade’ zones of chalcopyrite and bornite which extend laterally down-dip beyond the oxide-primary transition.
Following Marimaca’s consolidation of the project area and surrounding land packages in 2024, it has reinterpreted all available geological information and developed an updated geological model for Pampa Medina, which identified the lower sedimentary units of interbedded sandstones, shales and conglomerates as the productive horizons for future drill targeting.
Oxide copper mineralisation was logged in historical drilling in near-surface, uplifted blocks, with the model of continuity in the intact lithological sequence in deeper blocks for primary mineralisation to be tested by Marimaca’s 2025 drilling campaign.
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Images: Marimaca
