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Location: 86 km NE from Ghanzi, Botswana
Unit 6B, Tau Mall Plot 8624GhanziBotswana
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The T3 deposit occurs within the Ghanzi-Chobe belt in Western Botswana. The stratigraphy in this belt comprises the basal Kgwebe Formation volcanic lithofacies unconformably overlain by the Ghanzi Group sedimentary lithofacies.The Ghanzi Group is a dominantly siliciclastic marine sedimentary group comprising (in successively higher stratigraphic order) the Kuke, N’gwako Pan, D’Kar and Mamuno Formation sedimentary lithofacies. The Ghanzi Group is an overall fining-upwards succession of sedimentary lithofacies, with sandstone and conglomerates of the Kuke Formation overlain by arkose, siltstone, shale and limestone of the N’Gwako Pan, D’Kar and Mamuno Formations.The T3 deposit is focused on a NE-SW trending periclinal anticline with a core of N’Gwako Pan Formation that is overlain by a succession of D’Kar Formation sediments. The axial region of the anticline has been breached along a moderately northwest dipping brittle-ductile thrust zone such that moderately northwest dipping D’Kar Formation lithofacies in the hanging-wall of the thrust zone rest with angular contact upon sub-horizontal lithofacies in the footwall.The T3 Mineral Resource has been defined along an approximate 2km long strike length and 720m downdip and mineralisation remains open at depth. Mineralisation strikes and dips parallel to a 20 30 degree north-west dipping thrust zone, and is considered to be a structurally hosted, epigenetic deposit that formed synchronous with regional deformation.Cu-Ag mineralisation that forms the focus of the T3 deposit extends from approximately 25m – 300m below surface. The mineralisation strikes and dips parallel to the thrust zone and is considered to be a structurally hosted, epigenetic deposit that formed synchronous with deformation during Damara orogenesis. Mineralisation extends for 1940m along strike and the cumulative total true width of mineralisation within the thrust zone ranges from 10m – 80m. Numerous, sub-parallel zones of mineralisation are developed within the thrust zone with high-grade mineralisation focused on master dislocation planes and associated foliated zones. Cumulative total true width of mineralisation within the thrust zone ranges from 10-80m, with primary sulphide Cu mineralisation hosted within quartz-carbonate veins and disseminations.Primary sulphide copper mineralisation is hosted by one or more of chalcopyrite, bornite and chalcocite. Vein-hosted chalcopyrite and bornite are dominant, whilst disseminated chalcocite occurs in lesser amounts throughout the deposit.Where oxidised, primary copper sulphides are altered to malachite, chrysocolla or covellite. Mineralisation starts at shallow depth below surface (~25m depth) and extends beyond the limit of the planned open pit at ~250m depth.Host rocks include limestone, marl, shale, black shale, siltstone and sandstone within a 300m wide sequence of interbedded sediments within the lower part of the D’Kar Formation. The contact between D’Kar Formation and the Ngwako Pan Formation is approximately 150-200m below the base of the T3 deposit.
