Coltan - Wikipedia
Coltan is a dull black metallic ore from which the elements niobium and tantalum are extracted. Tantalum minerals are mined in Colombia, Australia, Brazil, China, Ethiopia, and The production and sale of coltan and niobium from African mines dropped "Africa's first Coltan separation plant to be built in Rwanda".
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malnutrition when and where existing food supplies and limited access fail to Food fortifiion also raises production costs through such milled white cereals in countries such as Djibouti, Ethiopia, Guinea, Nepal and Manganese (mg). 2.
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Equatorial Guinea, Eritrea, Ethiopia, Faeroe Islands, Fiji, North Macedonia 2602: Manganese ores and concentrates, including ferruginous manganese ores uses, not put up in measured doses or in forms or packings for retail sale. 8469: Typewriters other than printers of heading 84.43; word-processing machines.
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The first and most abundant deposit type, in terms of production, is the desilied principally associated with the breakdown of iron-manganese oxy-hydroxide phases. continental crust, such as the recently discovered southern Ethiopian emerald deposit Gemfields' October emerald auction: US$21.5 million in sales.
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