That was followed by Chach Victoriya of Bharat Coking Coal Limited (BCCL) late on Monday, while the third incident happened on Tuesday morning at the Gopinathpur open cast mine.
Rescue operations with heavy machinery are underway at the three mines, the officials said. Only the coal companies can specify the number of people trapped inside, said Superintendent of Police (Dhanbad-Rural) Reeshma Ramesan.
"I can't say much about the number of casualties and injured. We are verifying the details and would be able to give information only after getting reports. Our teams have rushed there," she added.
The officials said that families of the illegal miners are yet to report to the authorities, fearing police action. Locals had managed to rescue some of the miners before the colliery officials or the police reached the spot, they said.
An ECL official stated that the incidents have occurred at its abandoned mines and so the matter came under the purview of the district administration. "There is no such information (of collapse) in our working mines. The collapse might have happened due to illegal activities in the abandoned mines," he said.
"We are not in a position to tell about the number of villagers trapped," he added. Several slippers were found at the entry point of the mines, indicating many had ventured inside. The BCCL said that it will share the details later.
In Chach Victoriya mine of BCCL, three persons are feared trapped under the debris, official sources said.