Kangaroo Island, South Australia

Summary

Lithium Australia NL (‘LIT’) has made application for two exploration licence applications (‘ELA’) on Kangaroo Island (see Figure 1). The applications are the result of LIT’s strategy to continue its Australia-wide search for strong, domestic lithium holdings to add to its portfolio of projects.

Figure 1: Kangaroo Island project.

Geology

The initial application, Dudley (ELA2017/00005), lies on the eastern side of Kangaroo Island, 100 kilometres (‘km’) south-southwest of Adelaide and covers 27 km2.

There, the focus is the pegmatite intrusives into the Tapanappa Formation. The pegmatites form dykes and sills of predominately feldspar-quartz-muscovite, with varying amounts of topaz, tourmaline, graphite, citrine, and apatite. They are extensive, with up to a 5 km strike length presenting as discontinuous, partially buried exposures. Although there is mention of lepidolite in a report by the Geological Survey of South Australia, there has been no modern exploration for lithium minerals in the area.

The application contains the Dudley Mine, which operated during the early 1900s and 1980s. Gem tourmaline, ceramic-grade feldspar, silica, and kaolin for brickmaking were mined.

LIT’s second application, Vivonne (ELA2017/00013), lies on the western side of Kangaroo Island, 160 km southwest of Adelaide, and covers 44 km2. The underlying geology, which is similar to that of ELA2017/00003, consists of intrusive pegmatites in the Tapanappa Formation. These are more pod to stock-like, rather than dykes and sills. No modern exploration of these pegmatites is recorded.

Proposed exploration

LIT will commence desktop studies and assemble a database from open-file government and company reports. On grant, LIT will secure access and commence a programme of mapping and sampling of outcropping pegmatites. The surface geology will guide the planning of soil geochemical surveys designed to map the distribution of any additional pegmatite bodies obscured under shallow cover.

The outcomes of this exploration will provide LIT with a better understanding of the two areas’ potential to host lithium mineralisation and help define areas warranting further investigation by drilling.