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Location: 2 km N from Ravensthorpe, Western Australia, Australia
152-158 St Georges TerracePerthWestern Australia, Australia6000
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The Mt Cattlin deposit is a spodumene-rich, tantalite-bearing pegmatite within the Ravensthorpe Terrane, with host rocks comprising the Annabelle Volcanics to the west and the Manyutup Tonalite to the east. The contact between these rock types transects the deposit area.Several sub-vertical dolerite and quartz-gabbro dykes, trending roughly east-northeast and north, intersect all the lithologies including the pegmatite units. A significant sub-vertical fault with a north-northwest trending orientation transects the western side of the currently defined orebody and offsets the pegmatite as well as the main east-northeast trending dolerite dyke. Displacement across this fault appears to be oblique, with a west block down sinistral movement. The weathering profile across the Mt Cattlin area is typically shallow, with fresh rock encountered sometimes at depths of less than 20 m below the surface.Lithium and tantalum mineralisation occurs almost exclusively within the pegmatites. In places, the pegmatite occurs as stacked horizons that overlap in cross section. The current extent of mineralisation covers an area of around 1.6 km east-west and 1 km north-south. The main pegmatite units mined to date generally lie between 30 m and 60 m below the surface, although in some locations they could be found as surface outcrop. Mineralised pegmatite units have been drilled up to 180 m below the surface to the south, west and southwest of the main orebody and may have the potential to be mined from underground.The pegmatites have a diverse mineralogy hosting a rich array of minerals with spodumene as the dominant lithium ore mineral. Several types of spodumene are observed, which include light green and white varieties. Tantalum occurs as the manganese-rich end members of the columbite-tantalite series, including manganotantalite and microlite (Sweetapple, 2010).Dimensions The Mt Cattlin pegmatites strike north-south and are typically between 10 m and 30 m wide and are typically flat-lying or with a subtle dip east of around 5 to 10. Several different pegmatites have been identified, either as separate intrusions or due to fault offsets, over a strike length of 1,300 m, an across strike extent of 1,700 m and down to a depth of greater than 300 m below surface.
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