An expert panel noted that the project could lead to an increase in human-elephant conflict in the area.
Hemant Soren took oath as the 11th Chief Minister of Jharkhand.
Roy, who was denied a ticked by the BJP, is leading by 5,894 votes from Jamshedpur East.
The Congress-JMM-RJD alliance is leading in 45 seats with BJP ahead in 26.
The polling that began at 7 am in all assembly segments will end at 3 pm in five constituencies of Borio, Barhait, Litipara, Maheshpur and Sikaripara.
An affidavit filed in the Supreme Court by the state government shows that over 16,000 claims under the Forest Rights Act were rejected by Gram Sabhas while grappling with problems like unavailability of records and lack of documentation.
A total of 189 candidates are in the fray for 13 assembly constituencies for which the polling will be held in five phases commencing from November 30.
Congress leader Rahul Gandhi criticised the Narendra Modi government and "sold out media" for letting this slip under the radar.
Though the LJP wanted an alliance with the BJP, the saffron party was reluctant.