Lucapa Diamond Company Limited is preparing to commence the Lulo Diamond Concession in Angola. The aim of this 2-year program is to build on the positive exploration results to evaluate the known diamondiferous pipes at Lulo and explore for other possible kimberlite sources of the exceptional alluvial diamonds being mined after decades of trying to discover alluvial diamonds or kimberlite pipes. At Lulo, they have achieved both. They have already discovered an alluvial diamond field and two significant kimberlite provinces.
Mr Wetherall has confidence that they will find the primary kimberlite sources of the exceptional alluvial diamonds at Lulo, which is supported by several key factors including...
1. Lulo lies within the ideal tectonic and stratigraphic setting where the Lucapa Graben crosses Angola most diamond-rich Cuango Basin. The Lucapa Graben is the same geological belt hosting most of Angola producing kimberlite mines, including neighboring Catoca, the fourth largest diamond mine in the world.
2. The existence of two large kimberlite provinces at Lulo has 296 targets already identified.
3. The widespread discovery of alluvial diamonds within the concession.
4. Diamonds recovered include large high-quality gems occurring with smaller stones of lower quality, indicating proximity to the source of the larger diamonds and possible multiple sources.
5. The Lulo diamonds (specifically the large diamonds) are irregular shaped and have jagged edges, indicating they have not traveled far from the source.
6. Surface texture studies of all Lulo diamonds show very little sign of abrasion, which also points to a proximal source.
7. Certain size-frequency distribution curve graphs of alluvial diamonds recovered are more akin to kimberlite curves i.e. flatter and poorly sorted, than other types of mineralization, and
8. Lulo kimberlite targets have positive mineral chemistry, including recovery of G3D, G4D and G10D garnets that serve as indicator minerals.
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