Structural Control on Gold Mineralisation Revealed by Remote Sensing and Gis Techniques in Central North Darfur State, West Sudan, Dr. B.A.H. Hussein and Prof. K.A.E. Zeinelabdein
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Dr. B.A.H. Hussein
National Centre for Research
Sudan
Prof. K.A.E. Zeinelabdein
Al Neelain University
Sudan
Purpose: This research is focused on the structural controls on gold mineralisation in the central North Darfur state, west Sudan. The region is rich in its mineral resources; nevertheless, it lacks detailed geological studies for better understanding its potentiality. In addition to some security problems, its accessibility difficulties make the traditional field-based geological studies impossible. Accordingly, the main objectives of the present work are to utilise the means of remote sensing and GIs techniques, in addition to limited fieldwork, to determine structural control s on gold mineral is ation through individual and integrated interpretations of multispectral data, and to develop a regional model of the structural geology and gold occurrences in the study area. Methodology: The study area comprises various geo- logical units ranging from a precambrian metamorphic complex (which has been extensively weathered and eroded), to pleistocene rift filling un consolidated sediments, volcanic s, and several base metal occurrences. Landsat 7 ETM+ images were used, digitally processed and enhanced to recognise the hydrother mal alteration zoning that constitutes a significant remote sensing guide to gold mineral is ation.
Findings: Band ratio images disclosed the presence of several prospects that are now major gold deposits at kassab, umm Gus sa, Has hab a,A laga b,Ga brEl gh nam, kul kul, Dab at uga and or tow areas. The geo physical data have also proved to be a valuable tool to understand the surface and subsurface structures. The structural orientation analysis has revealed four dominant lineament orientations in the area: N-S, E-W,NW-SE and NE-SW, which are consistent with the regional tectonics. The control on gold was assessed in terms of lithological as well as in terms of structural elements. Most of the gold occurrences were found variably in shear zones and sutures. The prominent NE trending fault, identified from the satellite gravity data, has apparently controlled the distribution of gold occurrence of the study area. Furthermore, most of the gold occurrences of the study area have shown an intimate association with interpreted high gravity zones and quartz veins.
Practical Implications: The results of the present work will have important implications for future gold exploration.
Citation: Hussein. B. A. H. and Zeinelabdein. K. A. E.: Structural Control on Gold Mineralisation Revealed by Remote Sensing and Gis Techniques in Central North Darfur State, West Sudan. In Allam Ahmed(Ed.): Home-Books-Proceedings-SDC, Vol. 1, pp. 24 - 25. WASD: Brighton, United Kingdom.