26th Oct., 2000
Dear Dr Isobel clark,
I was made part the list of geostats from yesterday only and it is my
good fortune to see your reply in my first message. I had the opportunity
of corresponding with you on geostatistics during 1983-86.
Currently I am working with iron ore mines of Tata Steel in India. The
ore is won by opencast mining method with 12m high benches. The iron
ore consists of several types of ores each having definable quality
in terms of Fe, Al2O3 and SiO2; and physical characterisics such as
hard ore, soft ore, flaky ore, bluedust etc. making them to be
processed in wet and dry methods. In such a case, using all the iron ore
samples in kriging is leading to over=estimation of lean grade ores
and under-estimation of high grade ores if one sees block-wise. This
type of estiamtes are not acceptable to the production staff. Hence
I used variogram parameters of the entire iron ore samples to specific
ore type estimation for 12m benches with 100mx100m blocks using the
core smaples of that specific ore type, which satisfied the production
staff. Is the procedure correct? If not, can you please suggest a better
In anticipation of your valuable advice.
Dr P.V. Rao
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