Technical and Economical Effect on Phased mining of Open-pit;

Discussion on sectional mining,technical feasibility and economic rationality of steep side expansion of Guangou quarry is made and some issues to be noted are proposed due to the problems existing in the design and mining of the quarry,such as large stripping volume in the initial mining stage and voriation in stripping ratio during mining.

By using subarea-subsection mining method,multi-channel layout program,Heidaigou Open-pit Coal Mine has overcomed the technological continuity problems appearing in bench combination and has fully improved the capacity of existing equipments,so that the transportation distance has b.