Earlier, the state-based steel makers had alleged 'manipulated bidding' in OMC tenders, and said OMC iron ore rates are close to National Mineral Development Corporation (NMDC) ore rates, which are linked to international markets. India’s largest iron ore miner NMDC fixes the ore prices on quarterly basis for its buyers in Japan and South Korea. The prices are calculated taking global demand and supply scenario into consideration. Similarly, iron ore exporters at Paradip port follow the price benchmark in China. If they do not protest about the pricing, why steel makers are making it an issue? asked Mishra.