Survey of World Iron Ore Resources: Occurence, Appraisal and Use: Report of a Committee of Experts Appointed by the Secretary-General
United Nations Department of Economic and Social Affairs, 1955 - Iron ores - 345 pages
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50 per cent aeromagnetic aeromagnetic survey Africa alumina anomalies appraisal average banded iron formation beds beneficiation Bessemer blast furnace bodies carbon cent of iron cent silica chamosite coal coke concentrates consumption contain cost countries district drilling east Economic exploration exported feet figure fuel Geological Survey grade hematite high-grade ilmenite important indicated Iron and Steel iron deposits iron ore deposits iron ore resources kilogrammes kilometres Lake Superior Lake Superior type laterite lime limestone limonite low-grade magnetic magnetite Magnitnaya manganese massive Mesabi Mesabi Range metal Metallurgical methods metres miles million tons minerals minette occur oolitic open hearth operation outcrops output percentages phosphorus pig-iron plant pre-Cambrian present production pyrite range reduced region reserves are estimated rocks schists scrap sedimentary showing iron siderite silica sintering slag smelting South sponge iron sulphur taconite thick tion titanic oxide titanium United zone