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The results of  the mineralogical and geochemical  study of alluvial deposits of  the Bolsheinzer (Bzyak stream) and Suran Formations (Karaelga stream) are presented. Quartz (predominant), feldspar, epidote, kaolinite, muscovite, dolomite and accessory minerals (goethite, hematite, rutile, titanite, magnetite, pyrite, monazite,  zircon,  fluorite)  are  found  in  the mineral  composition. A comparative analysis of  the geochemical  characteristics of  various  types of  zircons  from  the Suran and  the Bolsheinzer Formations shows that they are genetically heterogeneous. The most rich in Th and U are rounded red zircons from the alluvial deposits of  the Suran Formation. The Th/U ratio  in  them varies  from 0.13  to 0.50,  and  in zircons of  hyacinth colour — 0.47–1.78. At the same time, the few data obtained on red zircons from the deposits  of  the Bolsheinzer Formation  show  that  they  are  geochemically  (absence  of U, Y,  low Th concentrations) differ from the red zircons from the alluvial deposits of the Suran Formation. In the alluvial sediments of the Suran Formation, relatively high contents of Zr, Co, Cr, Ni, Zn, Pb, Y, and also REE, which  in  total  amount make up about 600 g/t, were  revealed. The most  likely minerals  for  lanthanide concentrators are apatite and monazite. Gold was first found in alluvial sediments of the Karaelga stream, in which a high assay (about 940) and Au/Ag ratio was found, on average equal to 16.5, which is slightly different  from the composition of gold  from primary deposits and ore manifestations of  the Avzyan ore region in the Yamantau anticlinorium.

Mineralogy and geochemistry of the Bolsheinzer and Suran Formations of the lower Riphean (Southern Urals) on the results of schlich sampling