Ishda kon ishsiz bortining ratsional yon qismini aniqlash orqali ochiq usulda qazishning chuqurligini oshirishusullari keltirilgan. Chuqur konlardagi kon ishlarini olib borish texnologiyalarining tahlili o ׳tkazilgan va ularni qo ׳llashmisollari keltirilgan.
Tayanch iboralar: chuqur kon, qazish usuli, kon jinsi, trasportda tashish, tik qoyaning turg ׳unligi, bortning yonqismi, qiyalik burchagi, kon ishlarining rivojlanishi, R.B. Yun usuli, qazish usulining parametrlari va ko ׳rsatkichlari.
Methods of increase of depth of open development are given by definition of a rational profile of a non-working sideof a quarry. The analysis of mining technology in deep quarries is carried out and examples of their application aregiven in work.
Key words: deep quarry, mining method, rock, transportation, stability of ledges, bead profile, overall slope angle,mining schedule, method of R.B. Yun, parameters and indicators of the development system.