An important uranium mine of India is located at ____________.
A. Vashi
B. Jaduguda
C. Gauribidanur
D. Manavalakurichi

Hint: This mine has the distinction of being the nation's first uranium mine.
In Rajasthan, Jharkhand, Chhattisgarh, Meghalaya, Telangana, Andhra Pradesh and Karnataka, India has uranium deposits. At present, mines in Jharkhand and Andhra Pradesh are in operation.

Complete Answer:
Option A. Vashi: Vashi is a node across the Thane Creek of the Arabian Sea on the outskirts of Mumbai City in Navi Mumbai, Maharashtra. Vashi is one of Navi Mumbai's oldest and most populated nodes. Several businesses from Mumbai and other parts of India have set up shop there. The majority of new companies establishing a base in the township of Navi Mumbai are in or near Vashi. There is no Uranium mine in Vashi village, hence this option is incorrect.

Option B. Jaduguda: In Jaduguda village in the Purbi Singhbhum district of the Indian state of Jharkhand, the Jaduguda Mine (also spelt as Jadugoda or Jadugora) is a uranium mine. It started operating in 1967 and was India's first uranium mine. The Jaduguda uranium mine is an underground mining mine situated in the Jharkhand district of Purbi Singhbhum.
The mine is located at least 640 meters below the earth's surface and is accessible by a vertical shaft with a diameter of 5 meters. Uranium mine is situated in Jaduguda village. Hence this option is correct.

Option C. Gauribidanur: In the Indian state of Karnataka, Gauribidanur is a historic town in the Chikkaballapur district. There is no uranium mine in Gauribidanur. Hence this option is incorrect.

Option D. Manavalakurichi: Indian Rare Earths Limited (IREL) took on a number of private companies that worked in the mining and separation of beach mineral sands in the southern part and formed two additional divisions, one in Chavara, Kerala or the other in Manavalakurichi. In 1963, it became a full-time Central Government Undertaking under the administrative control of the Department of Atomic Energy(DAE). There is Indian Rare Earths Limited (IREL) company but not a uranium mine. Hence this option is incorrect. In India, there are two uranium mines and the important one is Jaduguda mine.

Hence, Option B. Jaduguda is the correct answer.

Note: India only operates two working uranium mines as of March 2012. Uranium is used in the production of radioisotopes for medical purposes and in nuclear science research as a fuel for nuclear power reactors for electricity generation.