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Location: 63 km W from Geraldton, Ontario, Canada
8000 Highway 11 P.O. Bag 10GeraldtonOntario, CanadaP0T 1M0
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The Brookbank property is underlain by metavolcanic and metasedimentary rocks that trend predominantly east–west and dip steeply to vertically to the south. Metavolcanic rocks consist of massive and pillowed, locally amygdaloidal, flows of basaltic composition along with related tuffaceous rocks. Pillowed flows exhibit tops to the north. The Brookbank property is transected by an east–west trending zone of extensive heterogeneous brittle and ductile deformation and hydrothermal alteration, which is referred to as the “Brookbank shear zone”. The deformation can be traced for a minimum of 10 km along strike through Irwin Township and remains open in either direction.Brookbank Property Mineralization The 6.5 km-long Brookbank shear zone hosts the Brookbank deposit and numerous other targets including Cherbourg and Foxear. The deposits occur along lithological contacts between mafic volcanics and metasediments. Other areas of gold mineralization are present in one or more of the localized deformation bands within the hanging wall mafic volcanics, which are generally parallel to the Brookbank main zone within the Brookbank shear-zone structure. The zones of mineralization at Brookbank, Cherbourg, and Foxear occur within one of several bands of intense deformation and hydrothermal alteration at or near the contact between domains of mafic flows and polymictic conglomerates. Hydrothermal alteration accompanying the mineralization consists of silicification, carbonatization, sericitization, chloritization, hematization, and sulphidation. This alteration is commonly marginal to the mineralized quartz-carbonate veins, fractures, and stockworks, and may exceed 50 m wide locally. Mineralogical studies indicate that the precious metal mineralization consists of gold-silver particles with an approximate gold-to-silver ratio of 80:20. The gold occurs primarily as late fracture-controlled mineralization. The mineralization forms elongated lenticular particles associated with grain boundaries and possibly crystallographic planes. The gold generally consists of fine-grained free-gold particles, although there is very little visible gold even in areas of plus 30 g/t Au assays. Gold values are highest in the quartz–carbonate veinlets/stringers. Sulphide mineralization (pyrite and minor chalcopyrite) is also present within the sheared host rock and quartz veinlets.
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