When forming the lower part of the working zone of the open pit - opening and preparation of new horizons - insufficient attention is paid to the shape of the excavated space of the lower horizon, which often cannot provide the most rational parameters of the blasted block, and therefore the maximum length of the mining front, which should compensate for the deficit arising from the mining front on the upper horizons. The present work provides the formation of the shape and parameters of the preparatory excavation, its position relative to the ore deposit and ensuring the maximum length of the mining front, taking into account the rational use of drilling and blasting.
Determination of productive capacity of open-pit mines is the main problem in designing field development by the open-cut mining method. Direction of mining operations in open-pits and characteristics of working area development in horizontal direction greatly influence result consistency in establishing productive capacity basing on mining and engineering parameters, especially when economic and mathematical methods are used.
Boundaries of open pits are the most important parameter of open-cast mining of deposits, methods of determination of which, unfortunately, are still not correct enough, which negatively affects the efficiency of open-cast mining. The Department of Open-Cast Mining and Rock Destruction conducts continuous research on the development and improvement of methods for establishing the final contours of pits, approving the results in the design studies of specific deposits. The last object of the research was the iron ore deposit Kurkenpakhk of AO Olkon, which is currently not exploited. In the course of the research there was a doubt in the expediency of using the traditional method of levelling the bottom of the pit. The authors propose a new method of levelling the bottom of the pit.
