Variations in the secondary xylem of hardwood trees ...
· Bolani ore mines and Odisha Mining Corporation (OMC) iron ore mines are loed in Keonjhar district, while Gorumahisani Iron Mine (Pvt.) Ltd. is loed near Rairangpur in Mayurbhanj district. Both the districts are adjoining the state of Jharkhand. All these three mines are some of the largest and the oldest iron ore mines in India.