Caracterização e avaliação de reserves geológicas do depósito mineral de Farim-Saliquinhé

Translated title of the contribution: Characterization and evaluation of the geological reserves in the Farim-Saliquinhé mineral deposit

Gilberto Charifo, José A. Almeida

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

This article presents an integrated methodology and main results of the geological and economic modeling of the Farim-Saliquinhé phosphate ore deposit, in Guiné-Bissau. This mineral mass was first recognized in the 1980s, by the Bureau de Recherches Géologiques et Minières (BRGM) as sedimentary.The morphological characterization was performed by depth and thickness estimation of coverage and mineralized formations (main phosphate rock F PA, and carbo-phosphate FPB, secondary). The P2O5 grades were characterized by 25 krigging and subsequently by geostatistical simulation, to infer the uncertainty and classify the reserves in terms of inferred, indicated and measured. Finally, the morphology and grades were converted into benefits and costs following a mineral exploitation scenario. With regard to the economic modeling, a pre-feasibility study is presented with sensitivity analysis, relative to the phosphate price, exploitation and transportation costs, and reduction on the phosphate price, if not concentrated. An estimate is also presented of the internal rate of return (IRR) of the project for a base scenario and one variant.

Translated title of the contributionCharacterization and evaluation of the geological reserves in the Farim-Saliquinhé mineral deposit
Original languagePortuguese
Pages (from-to)569-580
Number of pages12
JournalRevista Escola de Minas
Volume63
Issue number3
Publication statusPublished - Jul 2010

Keywords

  • Cumulative and grade curves
  • Cut-off grade
  • Farim-Saliquinhé
  • Krigging
  • Ore reserves evaluation
  • Phosphate
  • Pre-feasibility study

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