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Highlights
Marimaca Copper (TSX:MARI) progresses exploration at Pampa Medina in Chile
Extensional drilling expands the manto-style copper system into new ground
Updated geological model highlights deeper productive sedimentary units
Marimaca Copper (TSX:MARI) is conducting exploration at the Pampa Medina copper deposit in Chile, an area located within the Atacama Desert. The project sits at a short distance from the Marimaca Oxide Deposit, forming part of the company’s broader copper development efforts. Activities in the region draw interest from global mining markets where indices such as the asx 200 often reflect sector sentiment through listed resource companies.
Extensional drilling underway
The company has mobilised rigs to Pampa Medina to complete an extensive drilling program. Current work has expanded the high-grade stratiform copper system further west, reinforcing the scale of mineralisation beyond previously drilled ground. The program is designed to extend geological understanding and test new zones for copper mineralisation across the stratigraphic sequence.
Geological setting of Pampa Medina
Pampa Medina represents a manto-style copper deposit characterised by sedimentary rock units. The mineralisation is dominantly hosted within Jurassic-Triassic formations, including sandstones, conglomerates, tuffs and shales. These layers are covered by volcanic rocks and underlain by a Paleozoic complex that includes metamorphosed sediments and intrusions, forming a favourable geological environment for copper deposits.
Mineralisation characteristics
Copper mineralisation was initially logged in shallow zones, where oxide minerals such as atacamite and chrysocolla were identified. Subsequent drilling has revealed deeper sulphide mineralisation with chalcopyrite and bornite, extending laterally below the transition between oxide and primary systems. This progression confirms that the deposit hosts multiple styles of copper mineralisation across different depths.
Updated geological interpretation
Following a consolidation of land holdings in the Pampa Medina region, Marimaca Copper (TSX:MARI) undertook a reinterpretation of geological information across the area. This review generated an updated geological model that emphasises the lower sedimentary layers as priority horizons for future drilling. These layers, composed of interbedded sandstones, shales and conglomerates, are regarded as key host environments for copper sulphide zones.
Historical and current exploration
Historical drilling at the site intersected copper mineralisation near surface, particularly within uplifted blocks where oxide copper is more dominant. The current campaign is focusing on intact lithological sequences at depth to investigate primary copper mineralisation. The company’s ongoing efforts aim to delineate the full extent of mineralisation and to better understand geological continuity across the project area.
Strategic positioning in Chile’s copper belt
The Pampa Medina deposit is strategically positioned within a region renowned for its copper resources. Located in a flat desert valley at relatively low altitude, the project offers logistical advantages for exploration and drilling campaigns. Its proximity to the Marimaca Oxide Deposit strengthens the company’s exploration portfolio, with both projects forming part of a larger geological system in northern Chile.
Frequently Asked Questions
- What type of deposit is Pampa Medina?
It is a stratiform or manto-style copper deposit hosted mainly in sedimentary rocks. - What minerals are present at the site?
Mineralisation includes oxide copper such as atacamite and chrysocolla, along with deeper chalcopyrite and bornite. - Where is Pampa Medina located?
The deposit is situated in the Atacama Desert of Chile, close to the Marimaca Oxide Deposit.
