Dalli-Rajhara mines of Chhattisgarh are famous for –

Gold Production
Manganese production
Iron ore production
Bauxite production

The correct answer is: C. Iron ore production.

Dalli-Rajhara mines are located in the Dalli Rajhara tehsil of Durg district in the Indian state of Chhattisgarh. The mines are famous for their iron ore production. The iron ore from Dalli-Rajhara is of high quality and is used in the manufacture of steel. The mines are owned and operated by the National Mineral Development Corporation (NMDC).

Gold production is not a major activity in Dalli-Rajhara. Manganese production is also not a major activity in Dalli-Rajhara. Bauxite production is not a major activity in Dalli-Rajhara.