"The Chairman of the Investigative Committee instructed ... to report on the progress of the inspection on the fact of the incident in the Ruban mine," the ministry said in a statement.
The coal station was heated earlier at the enterprise.
The EMERCOM of Russia said that at the mine.
Ruban completed the evacuation of all miners after the emergency.
The Prosecutor's Office of the Kemerovo Region organized an inquiry into the incident.