"Bodies of eight persons have so far been recovered and five persons rescued from the site at Kulda open cast Basundhara-Garjanbahal coal mine area," a MCL spokesman said.
Sundargarh Superintendent of Police Sanjeev Arora, who was at the spot, did not rule out increase in the number of casualties as some more people were suspected to be trapped under the debris.
The injured persons were admitted to hospital, he said.
Meanwhile, Chief Minister Naveen Patnaik ordered a probe by the local revenue divisional commissioner.
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The MCL and the Odisha government separately announced an ex-gratia of Rs 3 lakh and Rs 2 lakh respectively to the next of kin of the deceased.
The MCL also sanctioned Rs 10,000 each for the victim's family members for the funeral. It was also providing the medical expenditure for the injured, the spokesman said.
Entry of people to this area was illegal and there were notice boards warning about it, the spokesman added.