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Gold/Mining/Energy : Winspear Diaminds (Bulls Board)
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To: freddy who wrote (72)1/31/1999 9:07:00 PM
From: teevee  Read Replies (1) of 1172
 
freddy,
First, the diamond size distribution in kimberlite is always lognormal. Assuming the grade stays the same in terms of carats per tonne, we know that about 4% of the diamond should represent 10 carat stones(about 27 diamonds each about 10 carats in size should be recovered from a 6000 tonne bulk at 1.14 carats per tonne) and that 30% (about 2000 carats in total) should represent diamonds larger than 1 carat in size. We don't know the exact sizes of the 22 stones between 1 and 6 carats recovered from the two 100 tonne bulk samples, but we do know their average weight is about 1.9 carats. I will make an educated guess that for about every 15 one carat stones, we will get a 10 carat stone, and extrapolating, for every 15 ten carat diamonds, we might get a single 100 carat stone. As I expect about 27 ten carat stones recovered from the bulk sample, there should be one and maybe two 100 carat stones recovered. Also, I now expect about three 30 carat stones. The chance for recovering a 200 or 400 carat stone is slim, but it is possible (I think 1 in 3 and 1 in 6 respectively).
regards,
teevee
PS: Al bets are off if the grade of the 6000 tonne bulk is significantly higher than 1.14 carats per tonne.
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