Ключевые слова: assay, base, black, blasts, cloud, coal, coalmine, cut, dig, digger, dirt, down, equipment, extraction, fossil, haul, heavy, hill, hole, huge, industry, landscape, load, machine, machinery, men, mine, mineral, mountain, natural, ore, pit, power, quarry, resources, road, rocks, technology, tools, tree, truck, visitors, work,