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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/12464

Title: Integrated geophysical study of the Subika Gold Deposit in the Sefwi Belt, Ghana
Authors: Takyi-Kyeremeh, Kwaku
Wemegah, David Dotse
Preko, Kwasi
Menyeh, Aboagye
Keywords: Magnetic susceptibility
resistivity
induced polarication
gold
mineralization
Issue Date: 3-Apr-2019
Publisher: Cogent Geoscience
Citation: Kwaku Takyi-Kyeremeh, David Dotse Wemegah, Kwasi Preko & Aboagye Menyeh | (2019) Integrated geophysical study of the Subika Gold Deposit in the Sefwi Belt, Ghana, Cogent Geoscience, 5:1, 1585406., https://doi.org/10.1080/23312041.2019.1585406
Abstract: Geophysical datasets, namely, electrical resistivity, induced polarization, magnetic susceptibility were measured and aeromagnetic interpreted on the Subika concession of Newmont Ghana Gold Limited in order to delineate and model the zone of gold mineralization. The electrical resistivity and induced polarization results delineated the gold mineralized zone as a narrow discrete resistor (>4900 Ωm) and high chargeability (>7.2 ms) zone with a strike length of about 2 km. A strip log plots of 12 diamond drilled core samples showed the zone of mineralization with high alteration and low magnetic susceptibility. Analysis of laboratory magnetic susceptibility measured on selected samples from the pit and selected core samples from the mineralized zones showed a negative correlation between the magnetic susceptibility and gold gradeswith a correlation coefficient of −0.2 and −0.74, respectively. Similarly, magnetic depth slice produced from the 3D model of the aeromagnetic data depicts the zone of gold mineralizationwith a low magnetic signature. The zonemineralizationwas also observed to be striking in the north-east direction. Mineralogical analyses of rock samples revealed alteration processes such as carbonization, sericitization, silicification, chloritization and sulphidation resulting from hydrothermal alteration which accounted for the low magnetic and the magnetic susceptibility signatures of the mineralization zones. The strong resistivity and chargeability response of the mineralized zones are therefore attributed to the silicification and sulphidation alteration, respectively. The results show the effectiveness of applying integrated geophysical, petrophysical as well as mineralogical study in revealing gold mineralization potential of the Subika deposit and the Sefwi belt as a whole.
Description: An article published by Cogent Geoscience and also available at https://doi.org/10.1080/23312041.2019.1585406
URI: http://hdl.handle.net/123456789/12464
Appears in Collections:College of Science

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