Gold Mineralization Discovery in Umm Sagata- Qala En Nahal areas, Gadarif State - Eastern SudanOsman Abuagla Daffalla Hamed, Mohammed Azmi, El-Sheik Mohammed Abdel- Rahman, Salih Ali Salih
A low density stream sediments survey has been conducted in Umm Saqata-Qala En Nahal area, Gadarif State – Eastern Sudan. The aim of the study is to explore for gold and associated elements using a cost and time effective exploration method, in a low grade non explored Pan- African volcanosedimentary-greenstone belt. An orientational study has been conducted to determine the optimum fraction (grain size) for sampling in a rich Savana zone. About 12 samples have been collected from a mineralized locality and sieved for –125 µm and – 63 µm. Both of the fractions have been analyzed for gold using wet chemical technique with detection limit 2 ppb. Trace elements havebeen determined using Aque- regia - ICP technique.
Concentrations of gold mineralizatin and associated elements are typically found in the finest grain size fraction (silt and clay, -63 µm).
As it is the first time to conduct such survey in the study area a number of gold anomalies have been recorded. After selecting the right fraction the Umm Saqata- Qala En Nahal area has been fully geochemical surveyed at a density of 1 sample per 7 to 10 Km2.