Abstract: A new large deep iron orebody was found in Liaoning.The process mineralogy of a Deep Iron Ore was investigated for its exploitation and utilization.The results show that the main iron mineral in the ore is hematite with subordinately magnetite and magnoferrite and rarely pyrite.And the iron is hosted by hematite and magnetite,which are separated and used from the iron ore.The mineral content of hematite with average Fe grade of 69.80% in the iron ore is 32.86% and then the average Fe grade 70.53% of magnetite is 7.12%,thus,the grade and recovery is up to 69.13% and 98.19% respectively in theory.The hematite with idiomorphic and allotriomorphic granular texture is occurred in such gangue mineral as quartz,dolomite,et al.On the other hand,the fine magnetite is often coated in hematite to form a metasomatic relict texture,which enhance the ferromagnetic property of hematite so as to upgrade hematite by magnetic separation.The particle size of hematite with uniform diameters vary from 0.02 mm to 1 mm,however,the particle size of more than 0.50 mm was little.The particle size of magnetite is less than 0.1 mm,and it changes between 0.02 mm and 0.05 mm.

Key words: Deep iron ore, Process mineralogy, Hematite, Mmagnetite