Ключевые слова: belt, belting, blue, bridge, brown, business, carbon, coal, commodity, concrete, construction, conveyor, crusher, crushing, dig, dirty, dust, energy, factory, geology, gravel, heavy, industrial, industry, large, long, machine, machinery, material, metal, mine, open, ore, outcrop, pit, pollution, power, quarry, raw materials, rock, rough, sand, site, soil, stone, technology, texture, transportation, white, work,