Backward modeling approach of Trenches in epithermal Au deposit of Glojeh, Zanjan, Iran
Publish place: اولین مسابقه کنفرانس بین المللی جامع علوم مهندسی در ایران
Publish Year: 1395
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
CCESI01_336
تاریخ نمایه سازی: 5 بهمن 1395
Abstract:
This paper proposes a statistical Backward Modeling approach that quantitatively predicts Au concentration from the known concentrations of the other associated elements (Ag, Cu, Pb and Zn) from the Glojeh deposit in Zanjan province. A geologically constrained data set is 288 samples and collected from 631.9 meter of trenches. These samples divided for training model and validation model by the ratio sample of 2:1, respectively. A full Cubic Model (CM) including independent variables (X), order 2 terms (X2) and interaction between variables (Xi×Xj) created. By removing Zn, Ag×Pb, Zn^2, Ag×Zn, Cu^2, Pb, Ag, Cu×Zn and Cu×Pb predictors, respectively in different steps from CM, this process lead to create Reduced Cubic Model (RCM). RCM is calculated with R2 (pred) equal to 74.90% and best convergence for different R's and the PRESS index show the minimum value of 47.312 while F-value confirm improvement of the modeling. RCM consist of Cu, Ag×Cu, Pb×Zn, Ag^2 and Pb^2 as a main predictor in the equation and validation group confirm RCM by R2=73.90%.
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Authors
Farshad Darabi golestan
P.H.D. student of mining engineering, Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran
Ardeshir Hezarkhani
Professor of Mining engineering,, Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran