- Hi Mercedes
You have what we call the "Paddington Mix" model -- a
mixture of spherical components with a 'ripple' effect
around it. I have used anisotropic Paddington Mixes
very successfully in several different geological
The reason we call it the Paddington Mix is that it
was first included in the Geostokos software for an
application at Paddington Mine in Western Australia.
This is a shear-enhanced gold mineralisation, where
the gold values are not restricted to shear zones
(cyclic) but are richer close to the shears. So we had
a model with a basic two component spherical but with
a cyclic component which varied wildly according to
whether it was parallel to or perpendicular to the
shears. To get the anisotropy, we varied cycle length
and damping parameter to achieve almost pure spherical
'along shears' and strong cycles across shears.
The model has also been used to characterise potholes
or ballrooms in platinum reef mineralisation, and we
(me and Gavin Lind) have a paper to be presented in
South Africa next month on using indicators and the
paddington mix to track down pillars and voids in old
abandoned coal mines.
You can see examples of the Paddington Mix in
Practical Geostatistics 2000, although we don't have
any anisotropic models in the book. Got to leave
something for Volume 2!
Check it out at http://geoecosse.bizland.com and the
book software at
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