report out here+++++++, page-2

seriously.................
Tawana has just announced that it has recovered a 4.66 carat stone from the
Tawana alluvials, down from De Beers' Finsch diamond pipe.

It's obviously important, because the diamond is worth money. But it's more
important in what it means to the likely grade of the alluvials. Diamonds
generate the classic nugget effect for sampling. Either you get one in the
sample, or you don't. So how representative is the sample.

Tawana has taken a few thousand tonnes of samples, and is currently
processing them. The processing to date has generated a value in carats per
hundred tonnes. But as they pointed out in the presentation, from the
amount they've sampled so far, they expect the grade from a full size mine
to be significantly higher. Why? Because they haven't yet got the full size
distribution of diamonds that they would expect from diamondiferous
alluvials. Like sampling, it's all about statistics. And this discovery -
4.66 carats versus the previous biggest stone of 2.02 carats - proves the
point. It means that the development of the alluvials is even more likely
beccause as they keep processing the samples they'll keep pushing the grade
up, and it will look even more attractive to develop.