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201231· In 2009 China purchased coltan for even less than $8 per kilogram according to its trade report while coltan exports from Rwanda costs between $13 and 31 per kilogram on a …
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2013313· Then prices for coltan at Rwanda a re . kept constantly low. But China purchased coltan for ev en less than USD8 per kg while exports . from Rwanda cost between …
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2024125· The price of coltan depends on how much tantalum it contains, but on average, a kilogram of the rare ore fetches $48 (£37), according to …
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