English to Romanian Tech/Engineering Mechanics / Mech Engineering mining

Double benching has been utilized as an excavation technique in open pit mines for many years. This process involves drilling, blasting, and excavating the material for the design bench height. A second bench is then excavated without the creation of a catch bench, i.e. only minimal offset from the first bench face is allowed when drilling off the second bench. The result is a double high bench face or double bench. The offset of the drill from the bench face, when drilling off the second bench, projects the lower bench face into the pit somewhat. This reduces the maximum attainable bench angle and enhances the probability of rock escaping the catch bench.