Ключевые слова: adult, africa, black, business, caucasian, chunk, coal, dark, dirt, dirty, discovery, employee, energy, engineer, face, fingers, geology, gold, grunge, hand, happy, hardhat, hat, helmet, holding, industry, job, lump, male, man, men, mine, miner, mineral, mining, old, people, petroleum, portrait, power, professional, protection, safety, showing, soot, source, stone, underground, worker, working,