Mining industry of Burundi
Results: 3
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1![]() | COLUMBIUM (NIOBIUM) AND TANTALUM By Larry D. Cunningham Domestic survey data and tables were prepared by Robin C. Kaiser, statistical assistant, and the world production table was prepared by Regina R. Coleman, internatiAdd to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2006-08-15 09:06:27 |
2![]() | COLUMBIUM (NIOBIUM) AND TANTALUM By Larry D. Cunningham Columbium (niobium—Nb) is vital as an alloying element in steels and in superalloys for aircraft turbine engines and is in greatest demand in industrialized countAdd to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1996-11-07 09:53:46 |
3![]() | PDF DocumentAdd to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 1996-08-28 13:38:17 |