Geological Modeling and Estimating Recoverable Reserves in Vietnam

APCOM 2009
Dong Van Vu, Diep Manh Vu,
Abstract So much work has been done in recent years using
mathematical geology and geostatistics to solve
practical problems that we no longer have to
apologise for nor justify the method. The method
is as good as the practitioner, which goes, after
all, for any technical application. There have
been enough case studies now to show that almost
any coal seams and orebody, simple or complex in
structure, which has a definable spatial
continuity, will be amenable to geostatistical
evaluation given that it is suitably sampled.
Early interpolation techniques catered only for
calculating the average values of a fixed volume
of ground which, in structurally complex coal
seams and orebodies would not reflect ultimate
selective mining of the coal seams and orebody
but today techniques do cater for estimating
recoverable reserves from exploration drilling.
The most useful tool, at the exploration stage,
is the variogram. This quantifies the range and
direction of continuity and lends support to
geological interpretation to modelling. It can
highlight potential problems due to
insufficiently close spaced drilling or, indeed
incorrectly orientated drilling. The relationship
between variability and block sizes, which is
quantified by the variogram, allows one to
interpret the degree of selectivity possible for
given selective mining units. The classification
of the resource or reserve is affected by the
range of influence of the variograms.
This paper presents the current arguments
revolving around the most appropriate geological
modelling and estimates of resource or reserve to
use for coal seam and bauxite orebody in Viet
Nam.
Keywords: Geology, Reservers, Geostatistics
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