NMDC produces about 30 million tonne of iron ore from three fully-mechanised mines, as per its website.The state-run firm has also hiked the price of iron ore fines, which are inferior grade ore, by Rs 400 to Rs 2,760 per tonne.The company is involved in exploration of a wide range of minerals including iron ore, copper, rock phosphate, limestone, dolomite, gypsum, bentonite, magnesite, diamond, tin, tungsten, graphite, beach sands, among others.This is the second price revision done by the company in a month.. Iron ore is the main ingredient used in making steel.New Delhi: Countrys largest iron ore producer NMDC has increased the price of high grade iron ore (lumps) by Rs 400 to Rs 3,000 per tonne. The last revision was China Titanium iron cored wire Company done earlier this month on February 2 when the company had fixed the rates of lump ore at Rs 2,600 per tonne and that of fines at Rs 2,360 per tonne. The revised prices, effective from February 23, exclude royalty, DMF (District Mineral Fund), NMET (National Mineral Exploration Trust), cess, forest permit fee and other taxes, NMDC said in a BSE filing