The B.C. Coroners Service says he was from Coleman, which is a community in the southwest corner of Alberta near the B.C. border.
"Mr. Lorenz was a water truck driver and was filling his truck with water when he was impacted by frozen rock which fell from a separate vehicle," the coroners office said in a written statement.
"He was transported to hospital in Blairmore, Alta., but he could not be resuscitated," the statement said.
No other employees were reported to be hurt.
B.C.'s Minister of Energy and Mines Bill Bennett said an investigation has been launched in partnership with other authorities.
Teck's Coal Mountain operation consists of approximately 3,000 hectares of coal lands, and produces steelmaking and thermal coal. It is roughly 30 kilometres southeast of Sparwood.