Study of structural and magnetic properties of ferriferous quartzites of South Korpanga area of Kostomuksha ore field

Structural and magnetic properties of ferruginous quartzite and of their magnetite were studied in connection with the development of the south Korpangsky area of Kostomuksha ore field. The methods of mineralogical, X-ray, thermal, Mössbauer analysis, electron microscopy, and kappa analysis were used. Cracks of tectonic origin were found in ferruginous quartzite. These cracks lead to over grinding magnetite in crushing process. The composition and content of mineral impurities in magnetite was determined. The contents of isomorphic impurities in magnetite was estimated. Purest ores conform with final progressive stages of metamorphism.