What's the process of iron ore mining? - QuoraMining iron ore begins at ground level. Taconite is identified by diamond drilling core samples on a grid hundreds of feet into the earth. Taconite rock comprises about 28 percent iron; the rest is sand or silica. These samples are analyzed and ca.how iron ore is crushed ready,Iron Mining and Processing in South Africa Iron Mining and . - Vulamanufacture. Crushing. Open pit mining is used to excavate iron ore that is close to the surface. The topsoil is removed and the ore is loosened by drilling and blasting. .. ready for transport. UNIVERSITY OF CAPE TOWN. IDYUNIVESITHI YASEKAPA • UNIVERSITEIT VAN KAAPSTAD. Surface mining. Underground mining.