Mapping of prospectivity and estimation of number of undiscovered prospects for lode gold,southwestern Ashanti Belt,Ghana |
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| Authors: | Emmanuel John M Carranza Emmanuel A Owusu Martin Hale |
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| Institution: | (1) International Institute for Geo-Information Science and Earth Observation (ITC), Hengelosestraat 99, PO Box 6, 7500AA Enschede, The Netherlands;(2) Faculty of Geosciences, Utrecht University, Utrecht, The Netherlands |
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| Abstract: | In the southwestern part of the Ashanti Belt, the results of fractal and Fry analyses of the spatial pattern of 51 known mines/prospects
of (mostly lode) gold deposits and the results of analysis of their spatial associations with faults and fault intersections
suggest different predominant structural controls on lode gold mineralisation at local and district scales. Intersections
of NNE- and NW-trending faults were likely predominantly involved in local-scale structural controls on lode gold mineralisation,
whilst NNE-trending faults were likely predominantly involved in district-scale structural controls on lode gold mineralisation.
The results of the spatial analyses facilitate the conceptualisation and selection of spatial evidence layers for lode gold
prospectivity mapping in the study area. The applications of the derived map of lode gold prospectivity and a map of radial
density of spatially coherent lode gold mines/prospects results in a one-level prediction of 37 undiscovered lode gold prospects.
The applications of quantified radial density fractal dimensions of the spatial pattern of spatially coherent lode gold mines/prospects
result in an estimate of 40 undiscovered lode gold prospects. The study concludes finally that analysis of the spatial pattern
of discovered mineral deposits is the key to a strong link between mineral prospectivity mapping and assessment of undiscovered
mineral deposits. |
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