ABSTRACT
Geochemical methods proved to be affective tools to prospect for mineral deposits and to reveal ore bodies which are either blind, covered by younger rocks and/or unconsolidated overburden. Lithochemical methods are based on quantitative assessment of criteria such as Secondary Dispersion Flow (S.D.F.), Secondary Dispersion Halo (S.D.H.) and Primary Halo (P.H.). In the Sudan, all the metallic and most of the non-metallic mineral occurrences are confined to the Precambrian crystalline Basement Complex (C.B.C.S.), which covers more than 50% of the surface area of the country. The C.B.C.S. is constituted mainly of migmatitic gneisses and schists of metavolcanic and metasediments. The gneisses are mostly of granitoidal composition which had been subjected to more than one cycle of metamorphism and deformation during Archean, Lower and Upper Proterozoic. Lithochemical methods have been practice systematically in the routine activities in prospecting for mineral deposits in the Sudan.
