Spatial Correlation of Gold and Silver Elements Concentration in Ghezel Ozen Region by Using Geostatistical Methods

‎The purpose of this study was to determine and evaluate of spatial distribution of gold and silver elements concentration by using geostatistical methods‎. ‎This study was carried out in Ghezel Ozen area for 95 samples of lithogeochemicals‎. ‎At first‎, ‎Censor data was replaced and the values of outlier's data were identified using the box-Plot and Q-Q-Plot charts and reduced by the Doerffel method‎. ‎Finally‎, ‎the data were normalized using logarithmic transformations and then the geostatistical analysis was used‎. ‎Variogram studies showed that the spherical model is the best fitted model and the spatial correlation range for the two elements of Au and Ag were approximately 2500 m‎. ‎Finally‎, ‎the estimation and estimation variance maps of the studied elements were prepared by using ordinary kriging geostatistical method with the spherical model on the GS‎+ ‎software‎. ‎Evaluating the results by calculating the root mean square error (RMSE) and calculating the mean absolute error (MAE) indicates the acceptable accuracy of variogram model‎. ‎By studying the kriging estimation and kriging estimation variance maps‎, ‎the anomal regions were introduced for the elements of Au and Ag in the case study‎.