Ключевые слова: accessibility, belt, blue, construction, conveyer, conveyor, dig, dump, efficiency, environment, equipment, excavation, exploration, generation, geology, gravel, heap, horizon, industrial, industry, land, landscape, machine, machinery, material, mine, mineral, modern, movable, open, outdoor, pile, pit, produce, product, production, quarry, sand, sky, sludge, spreader, stack, stacker, storage, technology, transportation, work,