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Location: 8 km NE from Blayney, New South Wales, Australia
57 Adelaide StreetBlayneyNew South Wales, Australia2799
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The Project is within the Silurian-aged Anson Formation of the eastern sub-province of the Lachlan Fold Belt (LFB). Due to its complex tectonic history, the LFB is a highly endowed Palaeozoic mineral province and hosts over 150 million ounces of gold. The deposit is hosted in the Anson Formation to the east of the Sherlock Fault, part of the Godolphin-Copperhania Thrust Fault Zone. The Anson Formation varies in composition from crystal tuffs and agglomeratic, matrix-supported accretions to limestones and siltstones. The McPhillamys gold deposit lies along one of a series of north-south trending splays/horsetail structures that occur at the inflection of the Godolphin-Copperhania Fault Zone where the orientation changes from NNW-SSE to SSW-NNE. The splays are defined by strong shearing and faulting and continue to the south for over 6km. The deposit is hosted by dacite- rich volcaniclastic rocks of the Silurian-aged Anson formation which vary in composition from crystal tuffs to agglomeratic, matrix-supported accretions.The volcaniclastics have undergone greenschist facies metamorphism, producing a mineral assemblage of biotite/ chlorite, muscovite, quartz, and k feldspar. This assemblage has been overprinted by a hydrothermal alteration assemblage of quartz + white mica (phengite) + carbonate (ankerite) along with gold and sulphide mineralisation. Gold mineralisation is located within a shear zone that has been defined over a width of 250 m, 800 m along strike and 700 m down dip (it remains open at depth). The gold mineralised zone trends in a northerly direction and dips steeply at 75° to 85° to the east and plunges moderately 50° to the northnortheast. The mineralisation is bound to the west by the Sherlock Fault and is structurally constrained between a set of normal faults trending northeast, southwest produced by dextral movement along the Sherlock Fault.The mineralisation is cigar shaped, beginning near the surface and extending near vertically to depth. Grade increases with depth with the highest grades near the bottom of the pit, the key driver of the pit shape.
