[Ferro-Alloys.com]State-run MOIL   has hiked prices of various grades of manganese ore by up to 50 percent for April-June quarter. In a filing to BSE, country's largest manganese producer said it has increased the prices of all ferro grades of ore by 50 percent over previous quarter (January-March) prices. The company said the prices of all grades of fines are increased by 10 percent. The company revises prices of manganese ore on a quarterly basis. "The price of all grades of SMGR (Mn 30 percent) is increased by 20 percent and SMGR Low (Mn 25 percent) is increased by 15 percent over the previous quarter prices," the filing said. Prices of chemical grades ore have been increased by 35 percent. There is no change in the existing price of Electrolytic Manganese Dioxide (EMD), Moil said.