Richard,
If you wish to use the chip samples to estimate the mean the formulea for the
estimate of the mean of a lognormal population is;
T* = exp(u* + 0.5 s*^2) pp73 Practical Geostatistics 2000 I. Clark
i.e. you need to have the variance of the samples to estimate the mean. The problem
is that the variance of the chip samples is different from the variance of the blocks
they represent, so before plugging the s* into the equation, you have to adjust it for
it's support. You can do this using the volume-variance charts provided in
Mining Geostatistics, A.Journel. Make sense?
Regards Digby
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