Ключевые слова: commodity, construction, conveyor belt, dirty, dust, energy, geology, gravel, gray, grey, heaps, heavy, industrial, industrialization, industry, inspector, machine, machinery, material, metal, mine, mound, moving, natural, ore, piles, platinum, pollution, precious, processing, raw materials, refining, rock, rough, safety, sand, silo, site, sorting, south africa, steel, stone, stones, storage, texture, transporting, work,