The Mine Rescue Service and the State Committee for Supervision of Labor Protection told Ukrainian News it had suspended efforts after methane levels exceeded one percent.
The quantity of dangerous gas in the dead-end part of the open-pit bench of the tenth south longwall face of contact bed K-5 close to the dam was 6%, and in the seventh south longwall face the degree of its quantity was 2.5%, Ukrainian News reported.
An explosion and a fire at the mine on July 19 killed 34 miners.
On July 28, rescuers found the bodies of three of the five miners whose fate was unknown following the explosion. That same day a rescue worker was killed after a loss of electricity disrupted ventilation, resulting in a sharp increase in temperature.