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Coltan (short for columbite–tantalite and known industrially as tantalite) is a dull black metallic ore from which the elements niobium and tantalum are extracted.The niobium-dominant mineral in coltan is columbite (after niobium's original American name, columbium), and the tantalum-dominant mineral is tantalite. USGS did not report data for other countries (China, Kazakhstan, Russia, etc.) owing to data uncertainties.Nova Dies, an offshore consortium based in British Virgin Islands, mostly controls the trans-Balkan transportation network.This network carries mostly unprocessed coltan mined in uncontrolled artisanal mines, and so it hinders the development of processing infrastructure in DRC.Therefore, this route is a long-term threat for DRC economy.

The central African countries of Democratic Republic of Congo and Rwanda and their neighbours used to be the source of significant tonnages.

Congolese have few tools to mine coltan, and no safety procedures or experience in mining.

There is no government aid or intervention in many unethical and abusive circumstances.

Tantalum is also produced in Thailand and Malaysia as a by-product of tin mining and smelting. Coltan is used primarily for the production of tantalum capacitors, used in many electronic devices.

Potential future mines, in descending order of magnitude, are being explored in Saudi Arabia, Egypt, Uganda, Greenland, China, Mozambique, Canada, Australia, the United States, Finland, Afghanistan,1990-1993: U. Geological Survey, "1994 Minerals Yearbook" (MYB), "COLUMBIUM (NIOBIUM) AND TANTALUM" By Larry D. Many sources mention coltan's importance in the production of mobile phones, but tantalum capacitors are used in almost every kind of electronic device.

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