Coal mining is dark, dirty, and dangerous work. It’s not for everyone — it’s for the few who love to descend into the bowels of the Earth to extract “black gold.” Even as they face the risk of mines collapsing, or catching on fire, or the long term health threats like black lung. As Curtis Burton, who spent the last 17 years working in or for coal mines in Pennsylvania, told Business Insider, coal mining is a hard job, but it’s also entirely unique.