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

Casmed Charles Amadu (), Sampson Owusu, Gordon Foli, GBlestmond A. Brako and Samuel K. Abanyie
Additional contact information
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
Sampson Owusu: Mineral Resources Department, Gold Fields Tarkwa Mine, P. O. Box 26, Tarkwa, Ghana
Gordon Foli: Department of Geological Engineering, Kwame Nkrumah University of Science and Technology (KNUST), PMB, University Post Office; Kumasi, Ghana
GBlestmond A. Brako: Department of Geological Engineering, Kwame Nkrumah University of Science and Technology (KNUST), PMB, University Post Office; Kumasi, Ghana
Samuel K. Abanyie: University for Development Studies, P O Box TL 1350, Tamale

Malaysian Journal of Geosciences (MJG), 2022, vol. 6, issue 1, 19-28

Abstract: The study described in this paper involves the application of a conventional resource estimation method, inverse distance weighting (IDW), and univariate geostatistical technique, ordinary kriging (OK) to the gold grades data from the modified palaeoplacer Teberebie gold deposit, in Ghana. The deposit consists of 4 layered well-defined orebodies referred to as A reef, CDE reef, F24 reef and G reef at the mine environment. Simple, reliable, and adequately accurate resource/reserve estimation are essential to mining operations. Data used for the research were collected by diamond and reverse circulation (RC) drilling. A total of 19353 one-meter composite samples, consisting of 18962 RC chip samples from 695 RC drill holes, and 391 diamond drill core samples from 11 DD holes. Samples were analysed by atomic absorption spectrometry (AAS) for gold (Au). Descriptive statistical treatment was conducted on grade values for the reefs. To analyse for spatial structure of Au mineralisation, experimental downhole, and several horizontal directional semi-variograms were computed, and models fitted. Ore reserves were estimated by OK and IDW methods, and results of the various reefs compared. Regression analysis of estimated results indicate that, the inverse distance square (ID2) model produced estimates that compared well with the OK model in all the ore zones. It is therefore, appropriate to use ID2 as an alternative estimation method to the OK method for purposes of mine planning and grade control.

Keywords: Geostatistics; palaeoplacer gold deposit; ordinary kriging; inverse distance weighting; and regression analysis. (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:zib:zbnmjg:v:6:y:2022:i:1:p:19-28

DOI: 10.26480/mjg.01.2022.19.28

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