The system of floor forced caving is widely used in the development of powerful, vast deposits. Representing a complex complex of mutually influencing and conditioning each other parameters and processes, in their compliance with mining geological and mining conditions, this system provides high labor productivity and low cost of ore extraction. ...

The methodology and results of laboratory studies of the process of collapse of overlying rocks are outlined. The researches are executed in the Leningrad Mining Institute for conditions of development of apatite deposits of Khibiny, hanging side of which is represented by strong fractured rocks.

Outstanding scientist in the field of underground development of mineral deposits, Professor, Doctor of Technical Sciences, Head of the Department of Development of ore deposits of the Leningrad Mining Institute Vladimir N. Semevsky was born in 1898. After graduating from high school from 1918 to 1922, a Red Army fighter he defended the western borders of the young Soviet Republic.