Abstract
Ground Frequency Domain Electromagnetic (FDEM) and Magnetic surveys were conducted in Southwest of the Ashanti belt in the Western Region of Ghana. The aim was to delineate potential gold mineralisation zones that may occur within the area. The magnetic data processing steps involved analytic signal, first vertical derivative, upward continuation, CET grid analysis as well as depth to basement model (Werner deconvolution). For the electromagnetic survey using the two coil separations (100 m and 150 m) and the multi frequencies (222 Hz, 888 Hz, 3555 Hz), the data in-phase component was processed to produce EM component maps showing the potential mineralisation zones. Lineament analysis using the rose diagram showed that the area is dominated by N-S and NNW-SSE lineaments. The upward continuation and depth to the magnetic source bodies indicated that the magnetic bodies in the study area can be located at depth less than 200 m.
Highlights
Exploration methods such as soil sampling, stream sediment sampling, augur sampling, trenching and mapping etc. have been the major exploration methods for identifying mineralisation in gold exploration projects
Ground Frequency Domain Electromagnetic (FDEM) and Magnetic surveys were conducted in Southwest of the Ashanti belt in the Western Region of Ghana
The Residual Magnetic Intensity (RMI) image was used in mapping the various lithological units while AS was used to place anomalies directly over their causative bodies because the source positions of the anomalies are defined vertically over the source irrespective of any remanence in magnetisation
Summary
Exploration methods such as soil sampling, stream sediment sampling, augur sampling, trenching and mapping etc. have been the major exploration methods for identifying mineralisation in gold exploration projects. Have been the major exploration methods for identifying mineralisation in gold exploration projects. This approach hasn’t been entirely successful since answers to questions such as what fraction of a sample constitutes a representative sample at a location and whether the sample is in-situ or transported have not been adequately addressed. Inadequate information in terms of structure, lithology and alteration is not obtained from these exploration methods especially in poorly exposed areas without outcrops. These shortfalls have resulted in unsuccessful drilling programmes due to delineation of wrong targets. At Banfara (Burkina Faso), after geochemical and structural geology had defined the main structural corridors, geophysical surveys were effective in delineating successful drill targets [2]
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