The use of rock density for improving morphological and metal grademodels of the Zambujal sulphide ore deposit (Neves-Corvo Mine)

D. M. Silva, J. Almeida

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

Abstract

The aim of this study is to build a high-resolution simulation model of the dilution and of the copper and zinc grades of the Zambujal ore deposit of the Neves-Corvo mine. Zambujal is a volcanogenic mabive sulphide deposit located in the southern Portuguese sector of the Iberian Pyrite Belt, and presents a mabive mab at the top and fibural ores at the bottom. To create a model of metal grades in this type of deposit, it is important to take into account the proportion of ore sulphides to waste rock. This proportion acts as a morphological variable and should be modelled prior to modelling the metal grades. Also, if the measured metal grades are recomputed to the ore sulphide fraction, it is expected that the ranges of variograms are filtered from the proportion variable. The results are validated by comparing the estimates of global metal reserves obtained using this methodology with those obtained using ordinary kriging, with the two sets of results shown to be similar. The sets of the simulated images of the proportion of ore and metal grades provide several local solutions for characterizing the uncertainty.

Original languageEnglish
Title of host publicationProceedings of IAMG 2015 - 17th Annual Conference of the International Association for Mathematical Geosciences
PublisherInternational Association for Mathematical Geology (IAMG)
Pages1075-1084
Number of pages10
ISBN (Electronic)9783000503375
Publication statusPublished - 2015
Event17th Annual Conference of the International Association for Mathematical Geosciences, IAMG 2015 - Freiberg, Germany
Duration: 5 Sep 201513 Sep 2015

Conference

Conference17th Annual Conference of the International Association for Mathematical Geosciences, IAMG 2015
CountryGermany
CityFreiberg
Period5/09/1513/09/15

Keywords

  • Copper deposits
  • Deposits
  • Metals
  • Sulfur compounds
  • Zinc deposits
  • Copper and zinc
  • High resolution simulations
  • Iberian Pyrite Belt
  • Ordinary kriging
  • Sulphide ores

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