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Location: 100 km E from Kalgoorlie, Western Australia, Australia
Level 1, 16 Ventnor AvePerthWestern Australia, Australia6005
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The Manna deposit is characterised as lithium-caesium-tantalum (LCT) type pegmatite swarms. The greenstone sequences within the vicinity of the Manna deposit are dominated by mafic and felsicintermediate igneous rocks, with minor sedimentary rocks, of the Kurnalpi Terrane of the Archean Yilgarn Craton. It is thought that the LCT pegmatite swarms, which includes the Manna lithium deposit, is likely to be associated with the Cardunia granitoid body.The Manna deposit is underlain by greenstone and granitoid rocks of the Kurnalpi Terrane. Two cratonscale structural corridors transect the project area: the Keith-Kilkenny Lineament, known locally as the Roe Shear Zone, and the Celia Fault, locally known as the Claypan Shear Zone. Greenstone sequences are dominated by mafic and felsic intermediate igneous rocks, with minor sedimentary rocks.There are forty-two sets of anastomosing pegmatite veins which contain significant lithium mineralisation and used for resource estimation. The pegmatites have been defined from geological logging and surface mapping. The lithium-mineralised zones were defined using all samples which were logged as either pegmatite in Lith1 or Lith2 from the logging. An upper cutoff limit of 8% for iron (Fe) was also applied to exclude samples with a significant amount of country rock.The pegmatite veins strike northeast-southwest and dip at -60° to -70° to the southeast. The main area is a set of fourteen pegmatites which has been drilled over an area of 1,900m by 400m and to a depth of 480m. There are fourteen pegmatites to the north, four to the east and ten pegmatites to the southwest of the main area. The individual mineralised pegmatites are 1m to 14m thick and have an average thickness of 3.6m.Mineralisation at Manna remains open at depth and down dip to the northeast. Visual logging along the 700m long outcrop indicates that the lithia mineralogy varies from spodumene-only in the southwest to spodumene-dominant to the northeast (with up to 10% lepidolite by volume). The pegmatite dykes dip at approximately 70–80° to the southeast, cutting across north-south trending greenstones dominated by basalt and gabbro. Weathering of the pegmatite is negligible, and fresh spodumene can be observed at surface.
