Some 220 miners were working underground when the blast occurred late Sunday at the mine in Qitaihe, a city in Heilongjiang province.
A 380-member rescue team has been searching for the miners trapped beneath the coal mine shaft after the blast, Xinhua News Agency reported.
The tragedy is believed to have been caused by a coal-dust explosion, which knocked out the mine’s ventilation systems. The main ventilation system was back on-line by Monday morning.
The mine is owned by the Heilongjiang Longme Mining, a conglomerate of four state-owned coal businesses.