Theoretical Estimation of the Critical Sampling Size for Homogeneous Ore Bodies with Small Nugget Effect |
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| Authors: | K Modis and K Papaodysseus |
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| Institution: | (1) School of Mining and Metallurgical Engineering, National Technical University of Athens, Zografou Campus, 15 780 Athens, Greece;(2) School of Electrical and Computer Engineering, National Technical University of Athens, Athens, Greece |
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| Abstract: | The aim of this work is to investigate whether it is possible to determine a critical sampling grid density for a given ore body, above which further improvement in the accuracy of the estimated ore reserves would be small or negligible. The methodology employed is based on the theory of information. First, it is proven that the range of influence, when appears in the variogram function, is a measure of the maximum variability frequency observed in the ore body. Then, a simple application of the well-known sampling theorem shows that, under certain assumptions, it is possible to define a critical sampling density as mentioned before. An approximate rule of thumb can then be stated: that critical sampling grid size is half the range of influence observed in the variogram. |
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| Keywords: | Geostatistics sampling density accuracy of estimation sampling theorem |
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