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