Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2740

Full Length Research Paper

Bivariate lognormal distribution model of cutoff grade impurities: A case study of magnesite ore deposit

Suheyla Yerel and Adnan Konuk
  1Bilecik University Civil Eng. Dept., Bilecik, Turkey. 2Eskisehir Osmangazi University Mining Eng. Department, Eskisehir, Turkey.
Email: [email protected], [email protected]

  •  Accepted: 26 November 2009
  •  Published: 31 December 2009



One of the most important aspects of magnesite ore deposits is for assessment of the cutoff grade impurities. The impurities in the magnesite ore deposit with grade higher than cutoff grade is waste, which is sent to the waste dump; the impurities lower than the cutoff grade are sent to the processing plant. The bivariate lognormal distribution will serve as an important tool for analysis impurities. In this paper, the Beylikova magnesite ore deposit impurities in Eskisehir (Turkey) were assessed by bivariate lognormal distribution model. This article presents a procedure for using the bivariate lognormal distribution to describe the joint distribution of correlated SiO2% and Fe2O3% rates of ore deposit. Through the results from the model, it was determined that there are magnesite tonnage rate, mean of SiO2% and mean of Fe2O3% involves the identification of cutoff SiO2% and cutoff Fe2O3%. These analyses are believed to assist the management of magnesite ore deposits and determine priorities to improve mining issues.


Key words: Magnesite, cutoff grade impurity, bivariate lognormal distribution, beylikova magnesite ore deposit, Turkey.