Oolitic hematite of the Neda iron formation is exposed on the north side of Hwy. Nodules of hematite up to 5 cm. The hematite is red to black, oolitic to massive, earthy to hard. It was mined along Iron Ridge near Mayville in Sec. Beds up to 55 feet thick occurred.
Hematite occurs at a number of places throughout the county in scattered outcrops of iron formation.
Hematite occurs as a component of certain slates within the Michigamme Slate at the Spread Eagle exploration pits in Sec. Red ocherous hematite used as paint was found in the upper beds of the St. Peter sandstone in the Centerville District, SW Sec. Hematite forms in the Penokee Range as a principle ore mineral in numerous mines in the Ironwood Iron Formation. Botryoidal, banded, oolitic and coarsely columnar needle ore also occur. The hematite, in conjunction with other iron oxides, replace iron carbonates.