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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 mineralisation at Manna is hosted within lithium-caesium-tantalum type (LCT) pegmatite vein swarms.Greenstone sequences within the vicinity of the Manna lithium 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 swarm, which includes the Manna lithium deposit, is likely to be associated with the Cardunia granitoid body. Mineralisation at Manna remains open in all directions. Thirty-five sets of anastomosing pegmatite veins which contain significant lithium mineralisation were interpreted and were used for resource estimation. The pegmatites have been defined from geological logging and surface mapping. The lithium-mineralised zones were defined using a nominal cut-off grade of 0.4% Li2O and having an iron grade of less than 8%. DimensionsForty-two anastomosing pegmatites have been identified at the Manna deposit which extend from surface to a depth of 500 m.The pegmatites strike northeast-southwest and dip to the southeast at 60–70°.The main area has 14 mineralised pegmatites and has been drilled over an area of 1,800 m x 400 m and to a depth of 480 m. In the East zone, four mineralised pegmatite veins are delineated to the southeast of the main set, and have been drilled over an area of 1,400 m x 400 m and to a depth of 400 m. The West zone, to the northwest of main, includes 14 mineralised pegmatites and has been drilled over an area of 1,900 m x 400 m and to a depth of 800 m. A new zone has been identified to the west which has 10 mineralised pegmatites and has been drilled over an area of 800 m x 400 m and to a depth of 400m. The individual mineralised pegmatites are 1–14 m thick and have an average true thickness of 3.6 m.
