Abstract
Application of geostatistical techniques when evaluating mineral deposits could reflect some geological characteristics which help through the stage of planning and production. In the present study, an attempt has been done on two phosphate deposits at Elsebaiya area on both sides of the River Nile namely: Um Tondoba mine at Elsebaiya East area and Western River Nile mine in Elsebaiya West area. Depending on the available data, statistical analysis illustrated differences in the distribution of P2O5 % and ore thickness within the studied areas. Geostatistics used to start with constructing variograms for P2O5 % and thickness for the two phosphate deposits to be used with ordinary kriging models, also constructing cross variograms between P2O5 % and thickness to be used with cokriging models where the difference in the variogram parameters reflected a specific variation for each deposit horizontally and vertically. The ordinary kriging models and cokriging models illustrated different distribution behavior through both the two kriging techniques.
Highlights
Elsebaiya area has long attracted the attention of many geologists because of the presence of economic phosphorite deposits
Geostatistics used to start with constructing variograms for P2O5 % and thickness for the two phosphate deposits to be used with ordinary kriging models, constructing cross variograms between P2O5 % and thickness to be used with cokriging models where the difference in the variogram parameters reflected a specific variation for each deposit horizontally and vertically
Ordinary kriging and cokriging methods were used to spatial estimation of P2O5 % in phosphate deposits at Elsebaiya area
Summary
Elsebaiya area has long attracted the attention of many geologists because of the presence of economic phosphorite deposits. The phosphorite of the Central facies belt represents the most economic occurrences and was confined to the following localities, the Red Sea coast from Safaga to Quseir, the Nile Valley between Idfu and Qena and the Western Desert on Abu Tartour Plateau. In this study, both ordinary kriging and cokriging methods were applied to investigate their precision on mapping the distribution of P2O5 % and thickness. Experimental variogram and cross variogram were constructed for two variables to characterize the spatial variability of the measured P2O5 % and thickness values depending on the available data. Depending on the parameters of the variogram and cross variogram models of two variables, a comparison between ordinary kriging and cokriging techniques was used to present distribution model of P2O5 % which could be used in mine planning and production
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