Ключевые слова: anthracite, black, brown, coal, concept, conveyor, dark, dirty, dungeon, energy, engineering, equipment, excavator, exploitation, factory, fuel, geology, guido, heavy industry, horizontal, illuminated, indoors, industrial, industry, longwall, machine, machinery, material, mine, mineral, mining, modern, new, pit, poland, power, raw, rock, science, symbol, tunnel, underground, wheel, workings,