Guiyang County, Hunan Province
The air changes at the entrance of the Baoshan Mine in Guiyang, a county in Chenzhou that sits on some of the richest mineral deposits in Hunan. One step in, the temperature drops. The walls go damp. Wooden timbers, replaced every decade since the Han dynasty, hold up a ceiling that carries the weight of the mountain above. A tunnel railway, once used to haul lead and zinc ore to the surface, now carries visitors into the darkness where the…