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Geostatistical Approach For The Estimation Of Shear-Hosted Gold Deposit: A Case Study Of The Obuasi Gold Deposit, Ghana

Author

Listed:
  • Casmed Charles Amadu

    (Department of Earth Science, Faculty of Earth and Environmental Sciences, CK Tedam University of Technology and Applied Sciences, P. O. Box 24, Navrongo, Ghana)

  • Gordon Foli

    (Department of Geological Engineering, Kwame Nkrumah University of Science and Technology (KNUST), PMB, University Post Office; Kumasi, Ghana)

  • Bernard Kissi-Abrokwa

    (Department of Earth Science, Faculty of Earth and Environmental Sciences, CK Tedam University of Technology and Applied Sciences, P. O. Box 24, Navrongo, Ghana)

  • Sylvester Akpah

    (Department of Computer Science and Engineering, University of Mines and Technology, P. O. Box 237, Tarkwa, Ghana)

Abstract

Underground mining at Obuasi in Ghana has been in operation since 1947. This paper uses geostatistical methods to evaluate gold ore blocks to ensure reliable grades for mining large tonnage and low-grade resources. Historically, the principal ores were low tonnage, high grade and relatively homogeneous quartz stockwork with simple geometry and average bulk grades in the range of 20-30 g/t that were evaluated using conventional polygonal methods and mined by semi-mechanized means. Currently, the ore is a shear-hosted mixed quartz vein and disseminated sulphide type deposit of low grade that is mined using highly mechanized means. The need therefore arises for a re-assessment of the estimation procedures to ensure prolonged and more profitable mining. Both diamond drill (DD) core and stope/cross-cut channel samples were taken from Block 1 at the mine for analyses and re-assessment. A wireframe model was used to constrain the three dimensional (3D) block model of the deposit. Ordinary kriging (OK) and multiple indicator kriging (MIK) geostatistical methods were used to estimate gold grades. Grade distribution is positively skewed with high spatial variability and extreme values while background values are established as

Suggested Citation

  • Casmed Charles Amadu & Gordon Foli & Bernard Kissi-Abrokwa & Sylvester Akpah, 2021. "Geostatistical Approach For The Estimation Of Shear-Hosted Gold Deposit: A Case Study Of The Obuasi Gold Deposit, Ghana," Malaysian Journal of Geosciences (MJG), Zibeline International Publishing, vol. 5(2), pages 76-84, October.
    • Handle: RePEc:zib:zbnmjg:v:5:y:2021:i:2:p:76-84
    DOI: 10.26480/mjg.02.2021.76.84
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    References listed on IDEAS

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    1. Ali Rezaei & Hossein Hassani & Seyedeh Belgheys Fard Mousavi & Nima Jabbari, 2019. "Evaluation Of Heavy Metals Concentration In Jajarm Bauxite Deposit In Northeast Of Iran Using Environmental Pollution Indices," Malaysian Journal of Geosciences (MJG), Zibeline International Publishing, vol. 3(1), pages 12-20, January.
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    Cited by:

    1. Casmed Charles Amadu & Sampson Owusu & Gordon Foli & GBlestmond A. Brako & Samuel K. Abanyie, 2022. "Comparison Of Ordinary Kriging (Ok) And Inverse Distance Weighting (Idw) Methods For The Estimation Of A Modified Palaeoplacer Gold Deposit: A Case Study Of The Teberebie Gold Deposit, Sw Ghana," Malaysian Journal of Geosciences (MJG), Zibeline International Publishing, vol. 6(1), pages 19-28, February.

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