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|Geostatistics is now widely used in the mining industry in the estimation of ore reserves and terms like kriging, variogram and estimation variance are becoming well known. Ordinary Kriging (OK) has been found by some practioners to be a superior tool compared with other ore reserve estimators. However, kriging hasn't been the ultimate solution to difficulties which may arise in ore reserve estimation. Several additional geostatistical techniques have been recently developed for more efficient ore reserve estimation in some deposits, especially gold and other precious metals. These include indicator kriging and probability kriging which are useful tools to work with in a selective mining operation.|