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Construction of confidence limits for global reserve estimates by means of block bootstrap

, : Construction of confidence limits for global reserve estimates by means of block bootstrap. Yerbilimleri 26(Pages 45-51

Global estimation is the first and most important step of evaluating a mineral deposit. Construction of confidence limits for estimates constitutes the most difficult stage of this procedure. In this study, block bootstrap method is considered in estimating the confidence limits. The method was applied to coal quality variables (calorific value and ash) and thickness of the Kalburcayiri lignite deposit at Kangal. For this purpose, 5 block sizes were considered. The 95% confidence limits for the global averages of the three variables were constructed by block bootstrap for each block size. The results indicate that when spatial correlation is high, as block size increases the intervals get wider while they do not change when the spatial correlation is low. It is observed that polygonal method produces shorter intervals than the bootstrap methods do.

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