Graduate Thesis Or Dissertation

 

Geology and mineralisation, Taylor-Windfall gold prospect, British Columbia, Canada Public Deposited

https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6d570190w

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  • The Taylor-Windfall gold prospect, located in south western British Columbia, is hosted by Cretaceous tuffaceous andesites, underlain by granodiorite phases of the Coast Range Plutonic Complex. Mining exploration companies were attracted to the area because of low transportation costs, and a favourable geologic environment defined by high angle deep-seated faults, andesite host rocks, proximal plutonic rocks, widespread hydrothermal alteration, and past gold production. Although a surface exposure of about 2 km² is highly siliceous, similar to the sinter of an epithermal hot spring-related precious metal deposit, the alteration assemblages (propylitic, high temperature corundum-andalusite, phyllic and argillic) present on surface, in subsurface exposures and diamond drill core, more closely approximate assemblages of a deeper porphyry system. Major oxide data indicate that MgO, CaO, and Na₂O were depleted, and Al₂O₃ and SiO₂ were added during hydrothermal alteration coincident with metalisation. Porphyry deposits are known to contain recoverable quantities of gold, however, a low potential for open pit and underground gold ore was demonstrated by the results of the 1984 exploration program. Reserves calculated from two tourmaline-tennantite-sphalerite-galena-chalcopyrite- tetradymite veins are about 1000 metric tons of about 0.4 ounces of gold per ton.
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