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Ghana airborne geophysics project in the Volta and Keta Basin : BGS final report

By C.J. Jordan, J.N. Carney, C.W. Thomas and P. McDonnell

Abstract

This report describes the work undertaken by BGS between November 2006 and March 2009 in\ud collaboration with Fugro Airborne Surveys Pty Ltd on an airborne geophysical survey and\ud ground reconnaissance mapping of the Volta River and Keta Basins, Ghana. The project was\ud supported by the EU as part of the Mining Sector Support Programme, Project Number 8ACP\ud GH 027/13. The initial contract duration was three years, but this was extended by five months\ud to account for acquisition of gravity data by another project.\ud Some parts of Ghana have been airborne surveyed as part of the Mining Sector Development and\ud Environmental Project, co-funded by the World Bank and the Nordic Development Fund, but no\ud work was carried out on the Volta River and Keta basins, which together form a major portion of\ud the Ghanaian territory.\ud The approximate areas covered by the surveys are estimated at 98,000 km² for the satellite\ud imagery and the airborne geophysics, except for the Time Domain Electromagnetic (TDEM)\ud survey which was limited to 60,000 km².\ud The main beneficiary of this project is the Geological Survey Department, GSD. The work\ud enhanced its geological infrastructure and its personnel received hands-on training on modern\ud geological mapping technology. Indirect beneficiaries were the mining and exploration\ud companies that can follow up the reconnaissance work with detailed exploration work.\ud The project was conducted in five phases, and this document reports on the BGS input to Phase\ud 1, 4 and 5, with no inputs required in Phases 2 and 3:\ud • Phase1: geological outline through Radar and optical satellite imageries.\ud • Phase 2: airborne geophysical survey over the two basins for magnetics and\ud Gamma Ray spectrometry (Fugro survey).\ud • Phase 3: airborne electromagnetic and magnetic geophysical survey of specific\ud areas, following the completion and interpretation of phase 2, using fixed wing\ud time domain technology (Fugro survey).\ud • Phase 4: interpretation of the combined geology and geophysics.\ud • Phase 5: production of factual and interpretation maps.\ud The full list of BGS products is outlined in Table 1 below, while Jordan et al. (2006) describe the\ud products delivered on schedule in Phase 1

Topics: Physics, Earth Sciences
Publisher: British Geological Survey
Year: 2009
OAI identifier: oai:nora.nerc.ac.uk:11395

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