VOL. 14, NO. 19, OCTOBER 2019 ISSN 1819-6608 ARPN Journal of Engineering and Applied Sciences ©2006-2019 Asian Research Publishing Network (ARPN). All rights reserved. www.arpnjournals.com 3417 SUBSTANTIATION OF DREDGING TECHNOLOGY OF WATER-BEARING DEPOSITS AT SUBZERO AIR TEMPERATURES Victor Evgenievich Kislyakov, Ravil Zinnurovich Nafikov, Aleksandr Konstantinovich Kirsanov, Pavel Viktorovich Katyshev, Natalya Aleksandrovna Shkaruba and Ekaterina Vasilevna Zaitseva Siberian Federal University, Rabochiy Avenue, Krasnoyarsk, Russia E-Mail: ve.kislyakov@mail.ru ABSTRACT The article deals with the problem of reducing dredge performance when operating at subzero air temperatures. This problem is particularly relevant for deposits located in the Far North, where the dredging season is limited by climatic conditions. During the period of subzero air temperatures dredge performance decreases significantly due to the icing of dredge structure. In consequence, dredging operations are terminated until the occurrence of favorable conditions for work. The article presents the review of the existing methods aimed at extending the dredging season, providing their systematization, which is based on the methods of water lanes ’ maintenance and formation in the open-pit dredging. The authors propose a method to isolate the open-pit mine with artificial materials, as well as consider the application of similar structures in the dredging industry. Existing structures are used to store mineral dumps, protect the environment from dust, as well as for other purposes. It was revealed that the most perspective material to isolate dredges was polycarbonate, possessing a number of advantages. An experiment was conducted to confirm the effectiveness of this method by creating a facility in the form of a hangar model. The hangar model was performed on a scale in compliance with geometric similarity. Thermal sensors and an infrared camera were used to record the results. This allowed obtaining the distribution of thermal fields in the constructed experimental hangar. The developed mathematical model allows determining the temperature inside the isolated space of the open-pit dredging depending on the water temperature of the open-pit and the ambient air temperature. It is revealed that the application of the proposed method will extend the dredging season, or even make it year-round. The authors have calculated hangar sizes while all sizes were accepted minimum for reducing the cost of construction and keeping the heat inside it. The application of the proposed method for straight and oblique dredging was considered. The hangar area was determined for the development of mines with dredges of different standard size. The optimal method of rock excavation was revealed. The authors offer the scope of application, as well as the technology aimed at extending dredging season. Keywords: placer deposit, dredge, dredging season, systematization, insulating structures, polycarbonate, winter period, productivity. INTRODUCTION Currently, one promising area in the dredging industry is the extraction of precious stones and metals, which are contained in placer deposits in significant amounts. The conditions of placer deposit occurrence allow their effective development using relatively simple technology. When developing placer deposits, dredge development method is characterized by high technical and economic indicators. This method can be used to develop water-bearing continental deposits, as well as technogenic accumulations of gold, platinum, and other minerals (Lorey III, 2002; Van-Van-E, 2010; Belov, 2011; Talgamer, Chemezov, 2012; Chemezov, Dementiev, Talgamer, 1990). This method has a number of advantages, such as the ability to be implemented in complex hydrogeological conditions, high efficiency, etc. However, in severe climatic conditions of placer deposits ’ localization, this method has a significant drawback, which is seasonality of works. The duration of the dredging season is largely determined by the climatic conditions of the area. Works’ seasonality is due to the difficulty of dredge maneuvering in case of ice cover formation in the open-pit, the icing of the rocks in digging buckets and elevator ladder, increasing the degree of wear of the dredging mechanisms that lead to increased downtime for repair and cleaning of ice (Figure-1).