Isobel,
Thankyou, in relation to Colins work then the variance
may be estimated from the sill of the variograms for
the two orebodies and if the two orebodies had lognormal
distributions, they may have a different mean and variance,
but may still display the proportional effect, i.e. similar coefficients of variation in which case Geostatistical
Ore Reserve Estimation, pp172 M. David points out that lognormal kriging may be avoided, from what I understand as relative variograms may be used instead
of lognormal variograms.
Digby
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