Several types of ore deposits are arranged in the Katsuraoka mineralized zone, which contains the unique magnetite deposits of the Katsuraoka mine, Hokkaido.
The distinctive variations in mineral paragenesis of magnetite, such as spinel-pyroxene-biotite, garnet-diopside or actinolite-epidote-quartz-sulphide minerals and lattice parameter of magnetite and other iron-oxide minerals of the deposits are the features which attract the nost attention. These characteristic features are differentiated according to the depositional stages of formation of each mineral.