LOM lucapa diamond company limited

Ann: Diamond Production Continues Ahead of Plan at Lulo-LOM.AX, page-110

  1. 12,265 Posts.
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    Fair ramp alright.

    Exploration milestones in my view are simple.

    1) Determine the kimberlite pipe is there (it seems fairly obvious to me, from all available facts, that it is)

    2) Determine through bulk sampling and/or drilling if the pipe is diamondiferous and locate the positions of the various facies of the pipe.

    3) Determine through bulk sampling that the high quality diamonds actually come from the pipe.

    4) And this is the one I still don't have an answer for. Drill the pipe to determine its geometry, grade????, and the various kimberlitic facies that form the pipe.

    In my last post I'd calculated that if the Lucapa pipe had the same grade as the richest part of the pipe at Letseng (2.07 carats per 100 tonnes) you would need approximately 4,000 metres of PQ (85mm) diamond core before you might expect to recover one average stone of 1.6 carats (which is LOM's block 8 average).

    Even at the block 8 average grade (for August) of 12.8 carats per 100 tonnes you would still need to drill 625 metres of PQ diamond core before you'd expect to recover one diamond of 1.6 carats.

    Where are the diamond experts out there who can answer my question. How are the reserve/resource and grade estimates measured (determined) at Letseng to allow commercial mining to be conducted?

    Eshmun
 
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