Symbols used in the
Text
h,d,b,l distances
or lengths
g(h) semi-variogram between two
points---theoretical model
g l(h) semi-variogram between two cores
along the same borehole---model
g*(h) experimental point
semi-variogram
g l*(h) experimental core semi-variogram
g(l;b) semi-variogram between
two parallel cores
c(l) semi-variogram between a point and a line
c(l;b) semi-variogram between a
line and a panel
H(l,b) semi-variogram between a point and a panel
F(l) variance
of grades within a line
F(l,b) variance
of grades within a panel
F(l,b,d) variance of
grades within a block
average value of the semi-variogram between two specified
‘areas'
a range of influence of a
semi-variogram
C sill
of a semi-variogram
C0
nugget effect
p slope
of the linear semi-variogram
a parameter
in generalised linear and de Wijsian semi-variograms
g grade
(value)
s standard
deviation of the grades
mean value of the grades
y logarithm
of the grade
y mean
value of the logarithm of the grade
sy standard
deviation of the logarithm of the grade
z Standard Normal deviate
f(z) height of the Standard Normal
probability density function
F(z) probability that a Standard Normal variate is less than z
c cutoff
value, selection criterion
c average grade above cutoff
P proportion
of the ore which is above cutoff
A ‘area'
to be estimated
T unknown
grade of area to be estimated
S sample set available for
estimation
T*
estimator formed from
the sample values
wi weight
accorded to sample @i@
se standard
error of a linear estimator
se standard error of the arithmetic
mean of the samples
sk standard error of kriging estimate
dq, dh a
small angle, a small distance