Abstract
In this paper, we present the results of a mineralogical
 study of the ores of the Karalveem deposit in
 the northeast of Russia (Central and Ruslovy areas).
 Gold mineralization is characterized by two types of
 ores: gold-quartz-arsenopyrite (quartz veins with native
 gold and sulfide mineralization) and gold-sulfide (metasomatites)
 in gabbrodolerite. In most samples, both types
 of ores are combined, making these complex ores
 are of particular interest. The main ore mineral is arsenopyrite;
 secondary and accessory minerals include
 pyrite, rutile, ilmenite, galena, chalcopyrite, monazite,
 sphalerite, and native gold. Native gold in quartz-sulfide
 and gold-sulfide ore types is present in a free form as
 microveinlets, micron-size segregations in the host rock,
 or as microinclusions in sulfides. Both ore types are
 characterized by the similar chemical composition of ore
 minerals: the fineness of gold in the gold-sulfide type
 is 870–900 ‰, in veins – 840–910 ‰. The trace element
 composition of pyrite and arsenopyrite from metasomatites
 and quartz veins is also alike. Based on this,
 it was concluded that the productivity of gold-sulfide and
 gold-quartz-arsenopyrite ores was formed by a single
 impulse.
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