high manganese iron ore armurerie-cagniart
MANGANIFEROUS IRON ORES. USGS. high in iron may alternate with layers or lenses very high in manganese and low in iron. There are also variations along the strike of the beds, however, resulting locally in changes along the same bed from high-grade manganiferous iron ore to low-grade manganiferous iron ore or even to iron ore containing little or no manganese.