Ключевые слова: black, black gold, bucket, coal, coal pile, coal structure, combustible, darkness, deposits, energy, energy source, energy storage, exploitation, extraction, flashlight, fossil, fossil fuel, fuel, glow, hard, hard coal, helmet, holds, in his hands, industrial, industry, light, lump, male, metal bucket, mine, miner, mineral, mining, night, palms, pollution, potential, raw material, rock, shale, shines, solid fuel, squeezes, stone, unclean, underground, wealth, work clothes, worker,