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Location: 1 km SW from Leonora, Western Australia, Australia
Level 7, 40 The EsplanadePerthWestern Australia, Australia6000
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Gross stratigraphy at Tower Hill from west to east is represented by a granitic footwall (FW), followed by a strongly deformed and foliated ultramafic unit, through to a mafic hanging wall (HW). Gold mineralisation is hosted in a moderately (35-50º) east dipping quartz vein package that sits locally between the granitic FW and the ultramafic HW. Quartz veins trend north-north-west and extend over a 1km strike. The quartz veins range from 1m to nearly 50m in width at the widest point. Gold distribution within quartz veins is ambiguous and it is difficult to confidently distinguish between mineralised and un-mineralised veins. In general veins within the mineralized sequence have internal laminations, fractures, and sulphides. The hydrothermal system at Tower Hill comprises two dominant alteration facies: the potassic alteration zone and the regional carbonation zone. The potassic alteration zone lies adjacent to, and encompasses, the granite–ultramafic contact. Immediately east of the potassic zone is the regional carbonation zone which is characterised by ultramafic comprising a talc–chlorite–carbonate assemblage. All auriferous veins lie within the potassic alteration zone.DimensionsMineralisation at Tower Hill has continuity over 1.2km along strike, and currently >800m down dip. Mineralisation width ranges from ~1 to 50m across strike.
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