Designing a pullback dragline panel for dipping coal seam conditions

Abstract

This study, in a broad sense, fills in the missing parts in previous efforts at pullback stripping mode design with a dipping coal seam. Three different spoiling procedures have been developed: the normal mode, where the coal seam is flat/nearly flat; the uphill mode, where the coal seam is dipping and the dragline spoils uphill; and the downhill mode, where the coal seam is again dipping but the dragline spoils downhill. The spoiling pattern has a great impact on dragline efficiency, The waste can be spoiled near the set on which the dragline sits or near the set on which the dragline digs. Each pattern has been analysed in pit geometry design. The study of pullback design has been extended to cover key cut waste placement in order to operate with various pit width values and spoil-side concerns to control spoil-bound conditions.