Document Type : Original Article
Research Institute of Comprehensive Exploitation of Mineral Resources of the Russian Academy of Sciences, Moscow, Russia Federation
Faculty of Mining, Saint Petersburg Mining University, St. Petersburg, Russia Federation
Kudryavy volcano is the world's only deposit of rare elements in the form of pure rhenium mineralization. The development of the field is hampered by numerous factors: high temperatures of geothermal fields, strong winds, fumarolic activity, where the use of a drilling and blasting method to destroy rocks in a crater can lead to the closure of all fumarole channels, which will lead to the accumulation of enormous energy and further eruption. The article describes the existing electrical methods for the rock destruction, it was found that the current-voltage characteristic of volcanogenic breccia with an increase in the distance between the electrodes more than 50 cm turns into a C-shaped dependence, reducing the current strength from 0.85 A to 0.2 A, forming a full breakdown channel. In this case, the minimum breakdown strength of the electric field is 0.3±0.1 kV/cm, with an increase in this indicator to 3.7 kV/cm, the efficiency of channeling increases to 2%. Around the breakdown channel, a new substance is formed with new conductive properties, different from volcanic breccia, which prevents the formation of the channel along the old trajectory.