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In the Eastern Desert of Egypt, some banded iron and volcanogenic massive sulfide ores have been considered auriferous
based on their assay results, though all available information indicate that gold, if presents, is epigenetic in these deposits.
Au anomalies in fresh BIF samples are completely absent (assaying tens of BIF samples from different locations in the
Egyptian Eastern Desert gave no gold concentrations). Even where subjected to pervasive metasomatism, gold values
in the Neoporterozoic BIF deposits are consistently nil. If reported in the BIF, gold is confined to auriferous quartz veins
along prominent fault/shear structures (e.g., Abu Marawat BIF). The banded iron ores are associated with Au-quartz veins
only where sheared and tectonized. A single evidence for the syn-genetic origin of occasional Au in the Egyptian BIFs is
completely missing. Stratabound gold deposits in the Egyptian basement are suggested on basis of assaying results of some
samples while no comprehensive genetic studies were done. This will remain a big problem of scientific credibility of the
classification suggested by Botros (OGR 2004). Accidental gold traces in some Egyptian massive sulfide ores can be related to
post-formation circulating metamorphic/hydrothermal fluids. On the other side, the majority of the discrete gold occurrences
in the Eastern Desert are of mesothermal vein-type, either related to fault/shear zones, or confined to peripheries of small
granitoid massifs in regional transpression/transcurrent systems. Gold could have been leached from various lithologic units
(i.e. volcanic/volcaniclastic or mafic/ultrmafic rocks in depth) or derived from late-orogenic granitoid magamas. Alternatively,
hot magmatic intrusions could have aided convection of metamorphic±meteoric, low salinity aqueous-carbonic fluids and
thus effectively dissolved, transported, and deposited gold in zones of dilation
Biography
Basem Ahmed Zoheir has completed his PhD at the age of 30 years from University of Munich (LMU) and Postdoctoral studies from Universities of Geneva, TU
Clausthal, Tubingen, Lulea TU, and the USGS. He has published numerous papers in reputed journals and serving as a reviver and editorial number, as well as a
consultant in Ore Geology
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