Spodumene Pegmatite Potential

The Greenbush lithium project covers 102km2 is located ~12km east of highway 599, about 95km north of Savant Lake and 70km south of Pickle Lake in the district of Thunder Bay, Ontario.

A 15m by 30m spodumene bearing pegmatite outcrop was discovered in 1955 on the northeast shore of a lake and sampled by the Ontario Geological Survey (OGS) in 1965.  The OGS chip was sampled across the full 15m width of the spodumene pegmatite outcrop, with results averaging 1.25% Li₂O.

The pegmatite comprises of albite-microcline-quartz and microcline-spodumene zones. The spodumene crystals are opaque whitish beige colour and locally altered to green muscovite. No lepidolite was observed.

In the area away from lake edges, there is very little mapped outcrop of any type and the transported cover is expected to be a thin veneer, varying between 1m to 10m deep.

The geological setting of the Greenbush Project is similar to the Root Lake LCT pegmatite field, 94km west along the Greenbush Lake Fault and Lake St. Joseph Fault, which defines the boundary of the English River and Uchi sub-provinces.

Further reading (ASX announcements):

13 February 2023 – Midas to Acquire Greenbush Lithium Project in Ontario, Canada.

Greenbush Project Overview