CONDITIONS FOR STABILITY IN A TYPE OF ENLARGEMENT OF MINING PERIMETERS TISMANA I AND II FROM E.M.C. ROVINARI.

Lignite coal pits in hilly areas from Oltenia arise geotechnical data and economic issues. Geotechnical problems are related to sizing the face, slope wall stability, pit's geometry design for safe operation and final phase of the works. The economic concerns apply to mining economical insurance and more complete recovery of reserves considering that between economical and safe operation of mining works, there is a contradiction in that inexpensive decreases with increasing operating safety. Based on these issues, the paper aims to solve these problems for terms of two coal pits (Tismana I and II) which extend their exploitation perimeters in hilly area. [ABSTRACT FROM AUTHOR]