The rebels also set on fire two pick-up vehicles of the NMDC before fleeing the spot, the police said.
"A large group of armed ultras stormed the NMDC's iron ore deposit no. 13 in the densely forested hills under Kirandul police station limits around 11.30 am when the survey work was underway there," Dantewada Superintendent of Police Kamlochan Kashyap told PTI.
The public sector undertaking has been carrying out a survey before commencing the mining work in the deposit.
Upon receiving information, security forces were rushed to the spot and the injured were shifted to a local hospital in Kirandul, he said, adding that a combing operation has been launched in the region to nab the attackers.
According to an NMDC official, the injured identified as senior manager PC Sahu, deputy manager Riktim Roy and driver Sudhakar were provided preliminary treatment at the project hospital in Kirandul and were being shifted to Raipur for further medication.
Naxalites have targeted the NMDC facility in Bailadila region several times in the past, opposing the mining project citing that excavation activities would drain the area of its resources and thereby enhance the displacement of tribals from their own land.
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