Abstract

Sian Goldfields Limited (SGL) recently re-examined its concession by integrating data in a GIS environment for the improvement of the mapping of the local geology as well as for delineating potential gold targets. Data employed included geochemical, topographic, geological and aerial photographic information. The geochemical data included 5660 soil samples collected over a terrain underlain by six different lithologies namely, rhyolites, greenstones, sheared greenstones, phyllites, sandstones and granites. The various lithologies and their boundaries were obtained from the shaded relief map derived from the topographic information whilst “ground truthing” confirmed and established the other geological contacts. The updated geology map generated from the geosciences data was superimposed on the soil gold geochemical plot. The integration of these datasets in the form of maps resulted in the easy definition of anomalous gold targets. The targets were delineated using background and threshold values of 30 ppb and 50 ppb respectively. The integration model approach portrayed many of the geological boundaries to have relations with mineralization. The use of the MapInfo-Discover GIS markedly aided to ascertain the geological contacts in areas where outcrops were uncommon. The re-analysis of the remote-sensed data and the ground truthing showed the clear contact between the Birimian system and the Voltaian units at the north eastern side of the concession. The integration of this information with soil geochemical gold results highlighted the most prospective gold targets. It is recommended that the granite-sheared greenstones/sheared greenstone-massive greenstones contacts and areas with defined soil anomalies should be subjected to further exploration works.

Keywords:

Data-driven, exploration, geoscience data, knowledge-driven, mineralization,

References

1. Arhin, E. and P.M. Nude, 2009. Significance of regolith mapping and its implication for gold exploration in northern Ghana: A case study at Tinga and Kunche. Geochem-Explor. Env. A., 9(1): 63-69.
   CrossRef    
2. Bolster, S.J.S., 1999. Regolith mapping: Is it really necessary? Exploration for the New Millennium. Aust. Inst. Geosci. Bull., 30: 125-135.
   
3. Bonham-Carter, G.F., 1996. Geographical Information System for Geoscientist: Modeling with GIS. Reprinted, Pegamon, Ontario, pp: 398.
   
4. Brabb, E.E., 1984. Innovative approaches to landslide hazards and risk mapping. Proceeding of 4th International Symposium on Landslides. Geotechnical Society, Toronto, Canadian, 1: 307-324.
   
5. Carrara, A., M. Cardinal, R. Detti, F. Guzzetti, V. Pasqui and P. Reichenbach, 1991. GIS techniques and statistical models in evaluating landslide hazard. Earth Surf. Proc. Land., 16(5): 427-445.
   CrossRef    
6. Fletcher, W.K., S.J. Hoffman, M.B. Mehrtens, A.J. Sinclair and I. Thomas, 1986. Exploration geochemistry: Design and interpretation of soil surveys. Rev. Econ. Geol., 3: 1-8.
   
7. Goldfarb, R.J., T. Baker, B. Dubé, D.I. Groves, C.J.R. Hart and P. Gosselin, 2005. Distribution, Character and Genesis of Gold Deposits in Metamorphic Terranes. In: Hedenquist, J.W., J.F.H. Thompson, R.G. Goldfarb and J.P. Richards (Eds.), Economic geology 100th Anniversary Volume. Society of Economic Geologists, Littleton, Colorado, USA, pp: 407-450.
   
8. Gunn, A.G. and J.A. Plant, 1998. Multidataset analysis for the development of gold exploration models in Western Europe. British Geological Survey Research Report SF/98/1.
   
9. Kesse, G.O., 1985. The Mineral and Rock Resources of Ghana. A.A. Balkema Publishers, Rotterdam, the Netherlands, pp: 610.
   
10. Lepeltier, C., 1969. A simplified statistical treatment of geochemical data by graphical representation. Econ. Geol. J., 64: 538-550.
    CrossRef    
11. Leroi, E., 1996. Landslide hazard-risk maps at different scales: Objectives, tools and development. In: Senneset, K. (Ed.), landslides. Proceeding of the 7th International Symposium on Landslides. Trondheim, Norway, Balkema, Rotterdam, June 17-21, pp: 35-51.
    
12. Naden, J. and J.B.D. Caulfield, 1989. Fluid inclusion and isotopic studies of gold mineralization in the Southern Uplands of Scotland. T. I. Min. Metall. B, 98: 46-48.
    
13. Ott, N., T. Kollersberger and A. Tassara, 2006. GIS analyses and favorability mapping of optimized satellite data in northern Chile to improve exploration for copper mineral deposits. Geosphere 2: 236-252.
    CrossRef    
14. Owusu, E.A., 2001. Multimedia geochemical sampling as an aid to target selection for gold in northwestern Ghana. Ghana Mining J., 7: 14-20.
    
15. Owusu, E.A., 2002. Determination of background and threshold for gold on the Bomburi concession, Northwestern Ghana. J. Sci. Technol., 22: 50-58.
    
16. Owusu, E.A., K. Dzigbodi-Adjimah and G. Mathesis, 2003. Integration of spatial and non-spatial information for the interpretation of soil geochemical patterns. J. Sci. Technol., 23(2): 53-62.
    
17. Sabins, F.F., 1986. Remote Sensing: Principles and Interpretation. 2nd Edn., W.H. Freeman, New York, pp: 449.
    
18. Steed, G.M. and J.H. Morris, 1986. Gold Mineralization in Ordovician Greywackes at Clontibret, Ireland. In: Keppie, J.D., R.W. Boyle and S.J. Haynes (Eds.), Turbidite-Hosted Gold Deposits. Geological Association of Canada Special Paper, 32: 67-86.
    
19. Van Western, C.J., 1993. Application of geographic information to landslide investigation and mitigation. Transportation Research Board, Special Report 247. National Academy Press, Washington DC, pp: 129-177.
    
20. Woodall, R., 1993. Success in mineral exploration. The Joubin-James Lectures. Geosci. Canada, 11(1): 41-90.
    

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