(However, its historical archives and artifacts had already been shipped elsewhere by this point.) Picher is among a small number of locations in the world (such as Gilman, Colorado; Centralia, Pennsylvania; and Wittenoom, Western Australia) to be evacuated and declared uninhabitable due to environmental and health damage caused by the mines the town once serviced.
On September 1, 2009, the state of Oklahoma officially dis-incorporated the city of Picher, which ceased official operations on that day.
More than a century of unrestricted subsurface excavation dangerously undermined most of Picher's town buildings and left giant piles of toxic metal-contaminated mine tailings (known as chat) heaped throughout the area.
The discovery of the cave-in risks, groundwater contamination, and health effects associated with the chat piles and subsurface shafts resulted in the site being included in 1980 in the Tar Creek Superfund Site by the US Environmental Protection Agency.
The state collaborated on mitigation and remediation measures, but a 1996 study found that 34% of the children in Picher suffered from lead poisoning due to these environmental effects, which could result in lifelong neurological problems.
Eventually the EPA and the state of Oklahoma agreed to a mandatory evacuation and buyout of the entire township.