A spokesman for the U.S. Bureau of Prisons says former Massey Energy CEO Don Blankenship has reported to a California prison to begin his one-year sentence.
Spokesman Justin Long says Blankenship is in custody Thursday at a federal facility in Taft, California.
According to the Bureau of Prisons' website, the facility is operated by a private corporation.
Thursday was the deadline for Blankenship to report. The 4th U.S. Circuit Court of Appeals Thursday denied a motion by his attorneys requesting that Blankenship remain free while he appeals his conviction.
Blankenship was sentenced April 6 to a year in prison and ordered to pay a $250,000 fine for conspiring to willfully violate mine safety standards at West Virginia's Upper Big Branch coal mine, which exploded in 2010, killing 29 men.