The explosion took place yesterday at Baoma Mining Co Ltd in Yuanbaoshan district in the city of Chifeng, state-run Xinhua news agency reported.
There were a total of 181 people working underground at the time of the accident, and 149 workers managed to get above ground, it said.
So far 268 policemen and 119 rescuers and medical staff have been rushed to the accident site.
This is the second big mine accident in China this week.
Twenty-one workers trapped in a coal mine in China after an explosion at a private coal mine in Qitaihe City, Heilongjiang provinceon November 30 were confirmed dead yesterday while search is on for one person.
Initial enquiries showed that the blast was an accident and that the mine was unlicensed, police said.
Chinese police had arrested the owner of the private coal mine and three managers yesterday, the emergency rescue headquarters said.
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