| Bre-X's
salted boreholes and
kriged boreholes
in three lines between SEZ44 and SEZ49
Test
for spatial dependence
The
"geostats" (kriging variances of sets of kriged estimates)
for each of the distance-weighted average show that kriging
does create an illusion of spatial dependence where it
does not exist. Fisher's F-test cannot be applied simply
because each kriged estimate is a functionally dependent
value of a set of independently measured values. After
all, only independently measured values give degrees of
freedom even measured in salted core samples.
Bre-X's
Busang was served to its shareholders as a "resource"
rather than a "reserve". Just the same, the practice of
interpolation by kriging between widely spaced lines of
boreholes (step-out drilling in exploration jargon) is
a scientific fraud whenever sets of boreholes within lines
do not display a significant degree of spatial dependence.
Indeed, interpolation without justification will always
be a scientific fraud no matter how many neologisms are
used to dress it up! |
