Assessment of uncertainty associated with grade-tonnage curves using geostatistical simulation


Tercan A., Akcan E.

TRANSACTIONS OF THE INSTITUTIONS OF MINING AND METALLURGY SECTION A-MINING TECHNOLOGY, vol.113, no.2, 2004 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 113 Issue: 2
  • Publication Date: 2004
  • Doi Number: 10.1179/037178404225004995
  • Title of Journal : TRANSACTIONS OF THE INSTITUTIONS OF MINING AND METALLURGY SECTION A-MINING TECHNOLOGY

Abstract

Grade-tonnage curves are important decision making tools at both the planning and operating stages of a mining project. In this study, uncertainty resulting from estimation of these curves is studied by simulation. In particular, the effect of short-scale variability, change of support and type of data distribution on the uncertainty are examined. The ratio R = Col(Co+ C) is considered as a measure of the short-scale variability and simulations are carried out for two extreme values of this ratio. Point support and block support with size of 20 x 20 m(2) are taken into account. Normal and log-normal data distributions are used. As a simulation technique, unconditional sequential Gaussian simulation is considered. The results show that short-scale variability, change of support and type of distribution affect the uncertainty considerably.