From the accident files @ MSHA…
This incident involves a failure to LOTO equipment during servicing and maintenance, with a contributing factor involving the mis-programming of the Programmable Logic Controller (PLC) which permitted equipment to be inadvertently energized without warning.
A mechanic/repairman, age 37, was fatally injured about 12:30 p.m. on January 8, 1997 when the blade mill in which he was working started up. He had a total of one year and five months of mining experience, all with this company. He had not received training in accordance with 30 CFR Part 48 (Training and Retraining of Underground Miners). The vice president of concrete business, notified MSHA at 1:40 p.m. on the day of the accident. An investigation was started the following day.