Three main genetic types of hematite can be recognised at Quadriltero Ferrfero (QF): Micaceous or schistose hematite derived by metamorphic/metasomatic process during regional metamorphism, increasing eastward, formed under temperatures ranging from 250C to 500C in CO2-rich aqueous carbonic, high- to medium-salinity fluids._x000D_
Hematite in shear and mylonite zones, showing a wide variation of fluid and temperature conditions, between metamorphic and hydrothermal conditions. Deformed quartz-specular hematite veins formed during the late phases._x000D_
Hydrothermal, compact and isotropic hematite developed during a brittle-ductile regime, forming the cement of the boudinage-kink breccia and jacutinga-type of gold mineralisation, under temperatures ranging from 80C to 140C in aqueous, low- to medium salinity, oxidant fluids, resulting from the interaction of meteoric and metamorphic/metasomatic fluids. Quartz-carbonate-sulfide veins were formed slightly later, through reducing fluids.