Board chairman of Chifeng Baoma Group (CBG) Qiu Zetian, CBG General Manager Zhang Xiaodong, General Manager of CBG subsidiary Baoma Mining Company Liu Haijun, and head of the mine Lyu Guoyou were among those arrested, according to the investigation team sent by the State Council.
The officials were arrested for alleged illegal mining and dereliction of duty following the accident on Saturday at Baoma Mining Company in Chifeng city.
There were "serious violations of laws and regulations" before the blast, State Administration of Work Safety said.
The mine was ordered to stop production in March for illegal mining, but operations continued, state-run Xinhua news agency reported.
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