Iron ore - Wikipedia
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in color from dark grey, bright yellow, or deep purple to rusty red. The iron is usually found in the form of magnetite (Fe 3 O 4, 72.4% Fe), hematite (Fe 2 O 3, 69.9% Fe), goethite (FeO(OH), 62.9% Fe), limonite (FeO(OH)·n(H 2 O), 55% Fe) or siderite (FeCO,List of mines in Indonesia - Wikipedia,This list of mines in Indonesia is subsidiary to the list of mines article and lists working, defunct and future mines in the country and is organised by the primary mineral output. For practical purposes stone, marble and other quarries may be included in this list.Quartz Grinding Plant in Indonesia | Mining, Crushing,,Customer Country: Indonesia Rock Type: quartz sand Max. Feed Size: 38 mm Grinding Capacity: 10-30 ton per hour Final Powder Size: 325 mesh Equipment & Plant: Two sets vertical grinding mill VM 130K, other optional equipment In new factory, the material to be crushed is the white quartz sand, combined with 10% coarse sand and 3% little quartz pebble, the moisture is 4%.