The study of present-day hydrothermal ore-forming process in Uzon caldera (Kamchatka, Russia) is reported. The structure of ore body and the distribution components are described. Parameters of ore-forming process (temperature, pH, Eh and activity of dissolved hydrogen sulfide) are measured with original experimental devices. Parameters of gas and liquid phase flow and heat of hydrothermal fluid are studied in details. Base on this investigation results, the thermodynamic model of ore-forming process in Uzon caldera is designed. This model includes several ore-forming mechanisms: boiling, cooling and mixing and oxidization of hydrothermal solution. The analysis of thermodynamic simulation results of is compared with the data on mineralogical data and concentration of forms of sulfur that has allowed establishing a role of various ore-forming factors in ore deposition. The new model of hydrothermal ore process which explains formation of the full ore structure as consequence of self-development of thermal solutions is offered. Calculated concentration of the dissolved forms of sulphur and ore components are in the good consent with the natural data. Results of the spent works can be useful at research of hydrothermal deposits and modern geothermal systems.

Среди разнообразных явлений природы вулканическая деятельность во все времена особо привлекала внимание человека. Мощные, величественные, порой мрачные, иногда грозные, но всегда прекрасные, а в древности мало или совсем непонятные картины вулканических извержений производили на людей всегда сильное впечатление. И неудивительно поэтому, что деятельность вулканов вызывала в человеке, с одной стороны, безотчетную тревогу, а с другой — поэтическое восхищение.
Люди различно воспринимают деятельность вулканов. Одни видят в них величественные и грозные явления природы, другие интересуются ими с точки зрения внешней красоты проявления внутренних сил земли, третьих поражает мощь вулканических сил, а четвертые стремятся разобраться во всех вулканических явлениях и выявить причины их— познать их.

"Каталог действующих вулканов Камчатки" является сводкой наших знаний на 1 января 1957 г. по действующим вулканам Камчатки.

This book presents new data on the composition, genesis and metal content of hydrothermal solutions in the areas of active volcanism and their significance in mineral formation.

The Eastern and Southern zones of Kamchatka arc presented in the second volume. They are characterized by a weaker activity, and their volcanoes arc not as large and powerful as those of the Northern Group. But volcanic manifestations here are more diverse. Half of the volcanoes are connected with collapse calderas. Huge hydrothermal systems are here too. Among them, the famous Valley of Geisers is one of the most picturesque places on Earth.
The book is abounded with colour photographs, maps, schemes, and sketches. They enable the reader to catch uniqueness of these colourful sights and will be of interest not only for specialists in volcanology and geology, but also to a great number of nature lovers.