Workers in bauxite (main precursor of aluminium) mines are often exposed to heavy machinery, noise, dust and high tropical temperatures. It goes without saying that this work comes with certain health hazards such as heavy injuries, cancer and a variety of lung problems. One day all miners will die eventually. It will then be hard to tell, whether they would have lived longer, if they would have had another job. After all we will all die one day. Anyway, dead miners need tombstones (at least those that choose to be buried). Secondary aluminium would be the perfect material therefore.