Gold Mineralization Discovery in Umm Sagata- Qala En Nahal areas, Gadarif State - Eastern Sudan

By Osman Abuagla Daffalla Hamed, Mohammed Azmi, El-Sheik Mohammed Abdel Rahman, Salih Ali Salih.

1- Abstract:

* 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 Savanna 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 have been determined using Aqua- regia - ICP technique.
•concentrations of gold mineralization and a 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.

المصدر: الملتقي العربي الدولي لاقتصاديات المناجم والمحاجر ، القاهرة 2012

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