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Directional variograms have been caleulated for the gold grades of Im drill cores taken from vertical dril holes. A spherical model semi-variogram with the following parameters has been fitted to the experimental semi-variograms: Co 15.0 (g/t)2; C 85.0(g/t)2 north-south 40m east-west 20m vertical 10m RangesAnswer the following questions (a) What would you assume to be the direction and strike of the orebody? Why? (b) What conclusions can you draw about the optimal drilling grid for this orebody? e) What would happen to the nugget variance if 2m drill core samples were takeinstd msmples? Would there be any advantage in doing this? Would there be any disadvantage? (d) What is the variance of the gold grades of lm drill core samples in this orebody? What is the variance of the gold grades of 10m x 10m x 5m (vertcal) selective mining units in this orebody? (e) If the ore-body is to be mined by open pit with a bench height of 10m what recommendations would you make about sample size (from a statistical perspective, not taking into account other operational factors)

science   Advanced-Physics   
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