Scholarly record
LOWERING THE ESTIMATION VARIANCE BY LITHOLOGY AND ALTERATION SEPARATION
Abstract
In the detailed exploration and reserve estimation, with separating the alteration (as the controller of the grade) in ore reserve and estimating the reserve in each alteration, the estimation variance will decrease and the accuracy of the estimation will increase. In the other hand without any additional drilling, it is also possible to decrease the estimation variance by lowering the sill of variograms. In this method, we have categorized the data into different lithologies and different alterations such as skarn and dikes (DK1a and DK1b) and potassic, phyllic, proplytic and argilic alterations. The variances and sills of all populations decreased noticeably. Due to lowering the variance and sill of variogram, the estimation variance of blocks decreased significantly. The reduced variance is 20 percent of total variance which could be achieved by additional drilling (at least 16000 m).
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References13
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