1151 powered mining equipment increases the energy efficiency by a factor of around 2.5 and gives corresponding savings of energy costs. Significant environmental benefits are the reduction of air pollutants and of noise. KEYWORDS Open pit, Erzberg, haulage, mobile mining equipment, electrification, trolley, battery 1. CONTEXT AND PROBLEM STATEMENT VA Erzberg GmbH introduced trolley assisted haulage on three main ramps in 2019 with an up-todate length of total 5.1 km. Two 500 m ramps lead from the lowest bench to the primary crushers. The third ramp, which is 4.1 km long, leads from 770 m a.s.l. to the waste dump heap level of 1100 m a.s.l. With these installations all loaded uphill haulage is covered. Figure 2 - Ramps with trolley installations at the Erzberg mine © VA Erzberg GmbH / Bavaria Luftbild-Verlags GmbH
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