Ключевые слова: black, black gold, bucket, coal, coal pile, coal structure, combustible, contamination, darkness, dust filter, dust mask, energy, energy source, energy storage, extraction, filter, filter mask, flashlight, fossil, fossil fuel, fuel, gas mask, glow, hammer, hard, hard coal, hazard, helmet, industrial, industry, light, lump, metal bucket, metal clamp, mine, mineral, mining, night, pneumoconiosis, pollution, potential, raw material, rescue, shale, shines, solid, stone, unclean, underground, wealth,