Ключевые слова: african ethnicity, black, business, coal, construction industry, construction site, construction worker, contractor, coveralls, dark, dirt, dirty, employee, energy, engineer, engineering, equipment, hard, hard hat, hardhat, helmet, horizontal, industrial, industry, job, labor, machinery, male, man, manager, mechanic, men at work, mine, miner, mineral, mining, occupation, person, pipe, piping, professional occupation, protection, safety, south africa, underground, uniform, work, work tool, working,