Lucapa Diamond Company Limited (ASX: LOM) (“Lucapa” or “the Company”) and its Project Lulo partners Empresa Nacional de Diamantes E.P. (“Endiama”) and Rosas & Petalas are pleased to provide a further progress update on the search for the hard-rock sources of the high-value alluvial diamonds being mined at the Lulo project in Angola.
As set out in the ASX announcement of 23 March 2020, the Canguige catchment area has become the focus of the Lulo kimberlite exploration program following the recovery of 45 diamonds of up to 3.75 carats from a stream sample taken from the Canguige tributary (Figure 2). As a result, drilling and preparations for kimberlite bulk sampling have been concentrated in the Canguige catchment area, which hosts 5 of the 16 kimberlites “top-rated” during the 2019 kimberlite review.
The L071 kimberlite sample will be the first of the kimberlites in the Canguige catchment area to be bulk sampled (Figure 1). L071 is estimated to be ~30ha in size at surface. Two bulk sample locations have been chosen at L071, where the completed delineation drilling showed the targeted volcaniclastic kimberlite (“VK”) was hosted.
Excavation of the ~2,000 tonne bulk sample has commenced at the first selected site (Figure 1), following which the VK material will be transported to the Lulo processing plant.
Figure 1: Kimberlite bulk sampling excavation activities underway at the first selected L071
sample site (left) and excavated volcaniclastic kimberlite (right)
Globally, only a small percentage of kimberlites are known to be diamondiferous and it is therefore not expected that every kimberlite to be bulk sampled will be diamondiferous. However, as a result of the low grade (low diamond count per tonne/ cubic metre) and high-value diamonds being recovered in the greater Cacuilo valley, more particularly the Canguige tributary sample and adjacent alluvial Mining Block 46, recovery expectations from any potential source kimberlite should be for similar low grade and high-value diamonds.
A total of 16 priority kimberlites are earmarked for bulk sampling. Delineation drilling, bulk sampling and additional stream or tributary sampling in the catchment areas hosting the 11 other priority targets will be conducted throughout 2020 and into 2021.
The drill rig has already relocated to the nearby L072 kimberlite where delineation drilling has commenced and VK material has been intersected in the first hole drilled.
Link zur englischen Pressemitteilung
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Source: Company websites