By Ken Ward Jr. Since May, former Massey Energy CEO Don Blankenship has been serving a one-year sentence in a federal prison in California. U.S. District Judge Irene Berger sentenced Blankenship to the maximum allowable jail time. He was convicted by a federal jury in December 2015 of conspiring to violate federal mine safety and health standards at Massey's Upper Big Branch Mine over a 15-month period prior to the April 5, 2010, explosion that killed 29 miners. Blankenship is appealing his conviction to the 4th U.S.