Lead poisoning is happening in Nigeria. Doctors without borders are running a lead poisoning intervention program. The outbreak of lead poisoning has killed 400 inhabitants since its discovery in the Zamfara state in 2010 according to Aljazeera.
Gold mines are largely to blame, the gold mines are full of lead, which presents a very dangerous work hazard. The process of grinding rocks to get gold ore litters the soil with lead. Children are dying as a result according to Aljazeera, being the most vulnerable to the disease.
This puts a tension of the mining industry which is very lucrative for Nigerians, but at the same time, poses a health risk. I expect this to slow the growth of gold as a commodity.