Answer : 4. "Rohil ( Sikar ) "
Explanation :

1. Large uranium reserves have been discovered in Rohil in Sikar district of Rajasthan.

2. Uranium Corporation of India Limited has mining operations at Bagjata, Jaduguda, Bhatin, Narvapahar, Mohuldih, Tummalpalle, Turamdih underground mines and Banduhurang opencast mines. It also runs two processing plants at Jaduguda and Turamdih.