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Location: 34 km W from Tolar Grande, Argentina
Carlos Pellegrini #125, 9th Floor, Apt.B, San Pedro, Buenos AiresSan PedroArgentinaC1009ABC
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Taca Taca is a porphyry copper-molybdenum-gold deposit hosted by granitic rocks together with dacite, dolerite, and rhyolite intrusions. The porphyry is characterised by hydrothermal alteration that grades from a central potassic core to an outer phyllic and argillic zone. Phyllic alteration is most common and is closely associated with mineralisation.The style of mineralisation is mainly supergene (chalcocite) and hypogene (chalcopyrite), overlain by a zone of variable thickness of leached copper. Mineralisation is disseminated and in fractures, veinlets, and quartz vein stockworks. Copper sulphides are mostly chalcopyrite and chalcocite with lesser bornite, covellite, and digenite and is broadly zoned with a chalcopyrite-bornite-molybdenite core yielding to a more pyritic halo around the edges.The leached horizon is depleted of copper mineralisation with a zone of gold mineralisation located within the thicker portion of leached material. Supergene zones are enriched with secondary sulphides and form a discontinuous blanket underneath the leached cap. Supergene mineralisation is variably mixed with hypogene mineralisation according to structure, varying lithology and alteration.Mineralisation remains open at depth and to the south and east of the deposit.Rock typesThe Taca Taca deposit’s mineralisation is hosted within the Ordovician granite batholith and comagmatic aplite and dolerite intrusives. A smaller, less explored deposit (Taca Taca Alto) is known to exist approximately 4 km to the west and lies outside the Company’s concession holdings.MineralisationMost of the mineralisation is hosted by phyllic-altered Ordovician granite and associated aplite and minor dolerite dykes. Dolerite dykes tend to have relatively higher copper grades due to the abundance of ferrous iron in mafic minerals, which promotes copper precipitation from hydrothermal fluids. Mineralisation is subdivided into an upper leached zone and underlying mixed supergene and hypogene zones.Mineral deposit typeThe Taca Taca deposit is a porphyry copper–gold–molybdenum system hosted principally within granitic plutonic rocks, with subordinate dacite, dolerite and rhyolite intrusions. Hydrothermal alteration forms kilometre-scale zones that grade outward from a central potassic core through phyllic and argillic assemblages. The propylitic zone is comparatively restricted for a deposit of this size. Phyllic alteration is the most pervasive and hosts most of the mineralisation. Late-stage argillic supergene processes have locally upgraded copper tenor.Mineralisation comprises an upper leached horizon overlying a mixed supergene–hypogene zone. Copper occurs disseminated and within fractures, veinlets and quartz stockworks. Sulphide zonation consists of a chalcopyrite–bornite–molybdenite core yielding outward to a strong pyrite-rich halo. The overall sulphide assemblage is mixed and more variable than typically observed in porphyry systems.Surface weathering and oxidation removed copper from oxide and hypogene copper minerals, producing a 150–300 m thick copper-depleted leached cap. The leached copper was remobilised and partially reprecipitated as secondary sulphides beneath the leached horizon, forming discontinuous supergene enriched zones dominated by fine-grained black chalcocite with lesser covellite. The boundary between hypogenedominant and supergene-dominant mineralisation is highly irregular and reflects alteration to depth along structures and within the host rocks. Copper grades within the supergene zones are typically higher than in the hypogene mineralisation.
