Determining the Best Search Neighbourhood in Reserve Estimation, Using Geostatistical Method: A Case Study Anomaly no 12A Iron Deposit in Central Iran

Authors

  • Marzeihe Shademan Khakestar
     Department of Mining, Metallurgical and Petroleum Engineering, Amirkabir University of Technology, 424, Hafez Ave., P.O. Box 15875-4413, Tehran, 15914
  • Hassan Madani
     Department of Mining, Metallurgical and Petroleum Engineering, Amirkabir University of Technology, 424, Hafez Ave., P.O. Box 15875-4413, Tehran, 15914
  • Hossein Hassani
     Department of Mining, Metallurgical and Petroleum Engineering, Amirkabir University of Technology, 424, Hafez Ave., P.O. Box 15875-4413, Tehran, 15914
  • Parvizz Moarefvand
     Department of Mining, Metallurgical and Petroleum Engineering, Amirkabir University of Technology, 424, Hafez Ave., P.O. Box 15875-4413, Tehran, 15914

Keywords:

Negative Kriging Weights, Slope of the Regression, Kriging Variance.

Abstract

Ordinary kriging and non-linear geostatistical estimators are now well accepted methods in mining grade control and mine reserve estimation. In kriging, the search volume or 'kriging neighbourhood' is defined by the user. The definition of the search space can have a significant impact on the outcome of the kriging estimate. In particular, too restrictive neighbourhood, can result in serious conditional bias. Kriging is commonly described as a 'minimum variance estimator' but this is only true when the neighbourhood is properly selected. Arbitrary decisions about search space are highly risky. The criteria to consider when evaluating a particular kriging neighbourhood are the slope of the regression of the 'true' and 'estimated' block grades, the number of kriging negative weights and the kriging variance. Search radius is one of the most important parameters of search volume which often is determined on the basis of influence of the variogram. In this paper the above-mentioned parameters are used to determine optimal search radius.

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Issue

Volume 81, Issue 4, April 2013

Section

Research Articles

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Published

2013-04-01

How to Cite

Khakestar, M. S., Madani, H., Hassani, H., & Moarefvand, P. (2013). Determining the Best Search Neighbourhood in Reserve Estimation, Using Geostatistical Method: A Case Study Anomaly no 12A Iron Deposit in Central Iran. Journal of Geological Society of India, 81(4), 581–585. Retrieved from http://www.geosocindia.com/index.php/jgsi/article/view/57224

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