Lithium mineralization has been identified during reconnaissance exploration within Lithium Australia NL (ASX:LIT) Lake Johnston project in Western Australia, 450km east of Perth.
- Discovery of pegmatites containing lithium, rubidium and
- Rock chip samples up to 3.94% Li2O
- Visible lithium micas (lepidolite and zinnwaldite)
The lithium occurs within abundant pegmatites which emanate from nearby fertile granites and intrude the adjacent greenstone terrains along brittle failures. The configuration is similar to a number of other Western Australia pegmatite occurrences, including the recently discovered Earl Grey lithium deposit (Kidman Resources ASX announcement, 6 September 2016) which lies approximately 70km to the west of the Lake Johnston pegmatite swarms. Similar discoveries have also been reported in the area by Poseidon Nickel.
Five lithium prospects, have been identified to date. These are referred to as the Whitten, Bulldog, Boundary, Trackside, and Floyd prospects and the respective locations are shown in Figure 3.
Pegmatites within and in close proximity to E63/1777 have been examined by Lithium Australia. Twenty one rock-chip samples were collected and submitted for assay. Quality control is detailed in the attached 2012 JORC Code Table 1. The pegmatites are lepidolite rich (Figure 4) but also contain a number of other lithium minerals, including zinnwaldite which, in some cases, contains high levels of caesium.
Lithium Australia Managing Director Mr Adrian Griffin:
“Lake Johnston has the right geological environment to produce abundant lithium pegmatites – it has large, fertile granites, adjacent to country rocks that have the most prospective physical characteristics for pegmatite emplacement. It is not surprising that our initial examination has revealed very prospective lithium pegmatites.”
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