GOLD DEPOSITS OF CENTRAL CHUKOTKA (RUSSIA)

The Central Chukotka gold-bearing region is characterized by the devel opment of gold ore deposits of different genetic types. Two gold distr icts - Kuul'sk and Ichuveem-Palyavaamsk - are distinctly distinguished here. They vary in geological structure and metallogeny. Gold quartz deposits (Sovinoe, Dor, and Kus'veemsk) are localized in the Kuul'sk d istrict in horst-anticlinal uplifts composed of the Paleozoic terrigen ous rocks. The Ichuveem-Palyavaamsk district is distinguished by a wid e spectrum of gold mineralization from impregnated gold sulfide with t he well-known large Maiskoe deposit to gold-silver epithermal Promezhu tochnoe deposit. The Palyangai deposit, which is composed of gold-rare metal mineralization, was also discovered here. The Mesozoic intrusiv e cupola structures, associated with the Mesozoic tectono-magmatic act ivization (TMA), play an important role in the localization of these d eposits. The geological structure of deposits and the composition of o res are described in this paper. The characteristic mineralogical and geochemical features of deposits and the thermobarogeochemical paramet ers of the ore-forming processes are specified here for some of them.