Voronov E. T., Head of Personal and Social Safety Department, Professor, Doctor of Engineering Sciences, e-mail: irinabondar1@mail.ru, Bondar I. A., Senior Scientific of Geological Scientific Centre, Associate Professor, Candidate of Engineering Sciences, Transbaikal State University

On the example of rock crystal deposit «Perekatnoe» in Yakutiya the scientific developments of crystal-saving technologies of productive hollows («seats») are presented. The parameters of the most characteristic crystal-containing «seats» and hollows are given in the article. The used system of development based on the selective crank of piezooptic raw material by means sublevel drifts and orts without nonproductive blocks between them is described in details by the author. The performance of preparatory and treating works forte whole cycle of treating blocks working off is also discussed. The author points out the methodic of crystal-saving «seats» discovering in inter ort productive zone on the base of using control-tapping screws. The saving technology of blasthole drilling during revelation of crystal-containing «seats» and hollows is considered. The special attention is paid to the treating crank of large-dimension crystal-containing hollows; the rational schemes of their revelation, technology of introducing treating works and affairs on providing safety of miners are observed in the article. The system of development by layer failure for largedimension crystal «seats» working off, providing safe conditions during treating revelation at minimum loss of crystal-containing raw material is suggested.

1. Voronov E. T., Bondar' I. A., Voronov D. E. Povyshenie effektivnosti i bezopasnosti podzemnoy razrabotki mestorozhdeniy gornogo khrustalya v kriolitozone (The rising of effectiveness and safety of underground mine workings of rockcrystal deposits in criolitozone). Chita : ChitGU, 2006.
2. Voronov E. T., Bondar' I. A., Voronov D. E. Sovershenstvovanie sistem razrabotki pri podzemnoy dobyche p'ezokvartsa (The perfection of the system of piezo-quartzs underground mining development). Vestnik MANEB — Vestnik of International Academy of Ecology, Man and Nature. 2006, N 5 (11).
3. Voronov E. T., Bondar' I. A. Povyshenie bezopasnosti i effektivnosti podzemnykh gornykh rabot na rudnikakh Severa (The rising of safety and effectiveness of underground works at mines of the North). Regional'nyy vypusk «Zabaykal'e» Gornogo informatsionno-analiticheskogo byulletenya — Regional issue «Zabaikalye» of Mine Informational and Analytical Bulletin. Moscow : Publishing house of Moscow state Mining University, 2007.