Miraziz Usmanov’s research while affiliated with National University of Uzbekistan and other places

The geochemistry and forms of occurrence of Te and Se in the primary gold ore of the main deposits of Uzbekistan (Muruntau, Charmitan, Kochbulak, Kyzylalma) have been studied by means of mass spectroscopy and electron microprobe. These deposits represent the four main exploited types of gold ore: /Au-W/Au-As/Au-Te/Au-Ag/. Abundances of Te, Se, Bi, As and Sb define the geochemistry of gold and silver throughout all the deposits. Tellurides and selenides are widely distributed in the ores, but tend to be dominantly present in micro-(<100 µm) or nanoscale (invisible) forms. Gold is generally present in native form. Tellurides and selenides form a number of microassemblages which are specific to the genetic type, reflecting bulk geochemistry, physicochemical conditions of formation, deposit zonation, as well as the formational depth, as seen from the present day exposure levels of the systems.