Jun 27, 2018 The iron ore sand is transmitted into secondary crushers by belt conveyors evenly and continuously. Then the out let of secondary crusher is carried into tertiary crusher, in which iron ore will probably be processed into powder size iron ore particles. Iron ore crushing procedure is ended right here 2. When coarse iron ore powder fed into.Jan 10, 2017 A Underground Method of Mining Iron Ore. Some ore deposits found in jasper-slates and in the horizon between these and their associated clay-slates in the latter they are true contact-deposits. They are found in this jasper- and clay-slate formation under varied conditions, yet, in all, certain characteristic laws are preserved.