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Location: 35 km S from Kalgoorlie, Western Australia, Australia
20 Walters Drive, Osborne ParkPerthWestern Australia, Australia6017
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The Mt Marion lithium mineralisation is hosted within a number of sub-parallel, northeast to northwest trending pegmatite intrusive bodies which dip at between 10° and 30° to the west. Individual pegmatites vary in strike length from approximately 300m to 1,500m and average 15m to 20m in thickness but vary locally from less than 2m to up to 35m thick. The pegmatites intrude the mafic volcanic host rocks of the surrounding greenstone belt. Large intervals of spodumene-bearing pegmatite in the southwest intersected during the 2016 and 2020 drilling are interpreted to be part of a sub-vertical, northeast striking feeder zone. The feeder zone is interpreted to be around 40m to 70m wide, extending approximately 400m along strike and down to over 400m below surface, and is open at depth. The lithium occurs as 5cm to 30cm long grey-white spodumene crystals within medium grained pegmatites comprising primarily of quartz, feldspar, spodumene and muscovite. The spodumene crystals are broadly oriented orthogonal to the pegmatite contacts. Some zoning of the pegmatites parallel to the contacts is observed, with higher concentrations of spodumene occurring close to the upper contact.A diamond drilling program in late 2023 has significantly increased confidence in the underground resource in the mine’s upper North Pit.Drilling confirmed the North Pit underground ore body is vertically dipping with a strike length of 500 metres and a thickness of 30 to 60 metres. Pegmatites were intercepted around 1.2 kilometres below surface.
