The death toll at Russia's Raspadskaya mine has risen to 60 after eight bodies were found by rescue workers.
Thirty people are still missing following two explosions at the mine on Saturday, which trapped miners and rescue workers.
Russian Prime Minister Vladimir Putin has ordered detailed investigations into the explosions.
Russian Emergencies Ministry spokesperson Veronika Smolskaya said rescuers searching the tunnels have not established contact with any of the missing.
The mine is located in the city of Mezhdurechensk, about 3,000km east of Moscow.