Gary Jones, 57,
had no pulse and stopped breathing after the large rock struck him in the legs and knocked him backward onto a heavy-duty conveyor belt on March 29.
Jones, who had been a coal miner for more than 23 years, was assisting in the installation of chain-link-type fencing on a wall where workers were preparing to move a large piece of machinery called a longwall.
A preliminary report of the accident issued by the U.S. Mine Safety and Health Administration issued the day after the accident contained no citations for the mine company.