State-owned NMDC on Monday announced that it has hiked the prices of iron ore lumps by Rs 200 to Rs 4,300 per tonne. The country's largest iron ore miner has also increased rates of iron ore fines by Rs 500 to Rs 3,410/tonne, NMDC said in a regulatory filing. The prices are effective January 1, and exclude royalty, district mineral fund (DMF), National Mineral Exploration Trust (DMET), cess, forest permit fee and other taxes, the company said.