Nonlinear disjunctive kriging for the estimating and modeling of a vein copper deposit
الموضوعات :
Ali Akbar Daya
1
(Department of Mining Engineering, University of Sistan and Baluchestan, Zahedan, Iran)
تاريخ الإرسال : 01 الأحد , ذو الحجة, 1439
تاريخ التأكيد : 27 الإثنين , جمادى الثانية, 1440
تاريخ الإصدار : 28 الإثنين , شوال, 1440
الکلمات المفتاحية:
Disjunctive kriging,
Chelkureh,
Vein type,
Zahedan,
ملخص المقالة :
Estimation of mineral resources and reserves with low values of error is essential in mineral exploration. The aim of this study is to estimate and model a vein type deposit using disjunctive kriging method. Disjunctive Kriging (DK) as an appropriate nonlinear estimation method has been used for estimation of Cu values. For estimation of Cu values and modeling of the distribution of Cu in Chelkureh, samples have been taken from 48 drill holes in Chelkureh, and the values of Cu have been analyzed. Resulting data from analyzing Cu values were converted to standard normal values using Hermite polynomials. Variography has been done in the Chelkureh deposit. After studying variograms in different directions, it was found out that the ore deposit has a mild anisotropy. The best-fitted variogram model was considered for disjunctive kriging estimation. The model consists of a pure nugget effect with 0.46 amplitude plus a spherical scheme with sill 1.20 and range 140 m. Consequently, a three-dimensional model of estimated value and error estimated value was provided by disjunctive kriging to divide the ore into an economic and uneconomic part. The models based on the estimate of the DK method in the study area exhibited an increasing trend of concentration from the center to North. Finally, validation between the disjunctive kriging carried out by using cross-validation. The result showed that the correlation of estimated values and real values was strong (63.4%).
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