Technical Report for the Fort Knox Mine - Kinross Gold

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Fort Knox Mine Technical ReportFigure 7-3: Regional Geology26
Fort Knox Mine Technical Report8.0 DEPOSIT TYPEThe Fort Knox gold deposit is hosted by a granitic body that intruded the FairbanksSchist. The surface exposure of the intrusive body is approximately 1,100 meters in theeast-west direction and 600 meters north-south. Several late Cretaceous to earlyTertiary intrusive bodies penetrate the Yukon–Tanana terrane (Blum, 1982). They rangefrom ultramafic to felsic composition and are distinguished from older intrusive rocks bytheir lack of metamorphic textures. The Fort Knox deposit is hosted by one of the westnorthwesttrending, late-Cretaceous granitic complexes. The pluton is offset by twonortheast structures, which display left-lateral strike slip movement. These structures,the Monte-Cristo Fault and Melba Fault, are regional in extent and offset the GilmoreDome Pluton south of Fort Knox. The Fort Knox pluton is composed of a light gray, finegrained granodiorite, medium grained biotite granite, and coarse grained, biotite graniteporphyry, which form blocky bedrock exposures. The diverse textural and chemicalgranitic varieties and sharp to gradational intrusive contacts suggest the Fort Knoxpluton is a multi-phase intrusive. The local occurrences of orthoclase megacrysts,resorbed quartz phenocrysts, and quartz glomero-phenocrysts support that observation.Crenulated quartz layers (brain rock) and dendritic growths of quartz and potassiumfeldspar present in the Fort Knox pluton contacts help to evaluate intrusive paragenesis(Bakke, 1994).The mineral deposits are generally situated in a northeast trending, structurally complexzone characterized by a series of folds, shear zones, high angle faults, and occasionallow angle faults. Northeast striking high angle faults influence the location of golddeposits. The dominant structural zones in the Yukon-Tanana terrane are the northbounding Tintina Fault system and the south bounding Denali Fault system. Northeasttrending faults and shear zones within the Yukon-Tanana terrane are related tomovement along these major structures. The northeast structures, which display astrike-slip displacement, were important to the localization of gold mineralization.27
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Technical Report for the Fort Knox Mine - Kinross Gold

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