Ключевые слова: big, blue, carbon, coal, construction, conveyor, development, dig, dirt, earth, energy, environment, equipment, excavator, fossil, fuel, gold, heavy, huge, industrial, industry, iron, large, machine, machinery, metal, mine, mine equipment, mineral, mining, mining industry, mining machinery, open, opencast, ore, outdoors, pit, power, production, quarry, rock, sky, stack, stockpile, technology, transport, vehicle, work, yellow,