The research by definition of optimum width dragline’s entry way by criterion of the relation of recasting ratio to volumes of losses of a mineral in block between entry ways described in the article. It is established that the increase of entry way’s width allows to lower recasting ratio.
Horizontal or gently dipping (less than 10 ), mineral deposits, to which the majority of sedimentary deposits, such as oil shale, coal, peat, clay, limestone etc. belongs to, with relatively thick sediment overburden advisable to practice using transtoptless overburden removal technology, that is using a powerful stripping equipment – draglines. The main advantage of this technology is the placement of overburden directly into quarries goaf, significantly reducing the rented for the waste dumps disposing areas, and reduce the costs of mining-reclamation works.
