 | | Journal (article/letter/editorial) | | pp. 3?7-404 THE ECONOMIC GEOLOGY OF COLUMBIUM AND OF (NIOBIUM) TANTALUM NICOLAS DE KUN CONTENTS...developmentof carbonatitedeposits,the resourcesof columbium have been increasedto rank in importancewith the...Americanminingindustrycallselement41 "columbium," U.S. chemists have however chosen "niobium." The rest of the world...world prefers"niobium." The historyof the two metalsshowsfive phases:1) discoveryin pegmatires, where...major depositsand especially Messrs.Bradford,A. Burne,Dr. de Neve, Major Farrington,Dr.Ing. Hermann, Messrs |  | | Journal (article/letter/editorial) | | Nechalacho; (19) Mt Weld; (20) Kamativi; (21) Manono-Kitotolo; (22) Motzfeldt; (23) Tanbreez; (24) Crevie;...Brockman Pitinga Nechalacho Mt Weld Kamativi Manono-Kitotolo Motzfeldt Tanbreez Crevie Kenticha Three Alloes...object, Mt Weld (Yilgarn craton). Here, the operating mine produces only rareearth ores beyond the zones, containing...Grenvillides in the south of Central Africa: Manono-Kitotolo in the Kibaran belt and Kamativi in the Dete-Kamativi...supplied from this part of Africa (the east of DR Congo, Rwanda, and Burundi) to the global market for |  | | Book | | considered to be a natural accumulation of useful mine ra l materials that can be profitably extracted...some tin, tungsten, and molybdenum minerals Niobium (columbium); possibly minerals of various rare chemical...whereas the other one te nds to flow. At the Dunkin mine of the Breckenridge district, Colorado, the Dunkin...after it passed into shale (Fig. 2-4). In the same mine several le nticul a r ore shoots are separated by...between porphyry and sediments, 350-ft level, Jerome mine, Ontario, Canada. Somewhat simplified after W. L |  | | Report (issue) | | and siderite from Beaver County, Pa __ Ellsman mine, Glasgow, and Midland Stratigraphic sections, Beaver...tables, it was assumed that Rhodesia had continued to mine at the same rate of about 860 metric tonnes (950...to build a $4 million spodumene concentrator at Manono. Table 14 is included to show world trade for lithium...Lake, Utah, U.S.A. Salar de Atacama, Chile Manono-Kitotolo District, Zaire These represent producing districts...Lithium Corporation of America opened up its own mine some 5 miles northwest of its Bessemer City, North |
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