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Location: 45 Km NW from Lilongwe, Malawi
Level 9, 28 The EsplanadePerthWestern Australia, Australia6000
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A particular paragneiss unit rich in rutile and graphite is the primary source of both minerals. The high-grade rutile deposit at Kasiya is best described as a residual placer. It is formed by weathering of the primary paragneiss host rock and concentration in place of the heavy minerals such as rutile, as opposed to the high-energy transport and concentration of heavy minerals in a traditional placer. Rutile mineralisation lies in laterally extensive, near surface, flat “blanket” style bodies in areas where the weathering profile is preserved and not significantly eroded. Kasiya shows widespread, high-grade mineralisation commonly grading 1.2% to 2.0% rutile in the top 3-5m from surface. Moderate grade mineralisation generally grading 0.5% to 1.2% rutile commonly extends from 5m to the base of the soft saprolite unit to generally 20-25m depth where it terminates on the hard saprock basement. Graphite generally occurs in broad association with rutile. However, it is depleted in the top 3-5m and therefore can often show an inverse grade relationship with rutile in the near-surface zones. At depths generally greater than 5m a more consistent rutile-graphite grade relationship exists.The low-grade graphite mineralisation occurs as multiple bands of graphite gneisses, hosted within a broader Proterozoic paragneiss package. In the Kasiya areas specifically, the preserved weathering profile hosts significant vertical thicknesses, from near surface, of graphite mineralisation.The Kasiya mineralised footprint strikes NE – SW and currently occupies an area of about 201km2 .The mineralisation has been released by weathering of the underlying, layered gneissic bedrock that broadly trends NE-SW at Kasiya North and N-S at Kasiya South. It lies in a laterally extensive superficial blanket with high-grade zones reflecting the broad bedrock strike orientation of ~045° in the North of Kasiya and 360° in the South of Kasiya.The mineralisation is laterally extensive where the entire weathering profile is preserved and not significantly eroded. Minor removal of the mineralised profile has occurred in alluvial channels.
