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In page Coltan mining and ethics:

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Some people question the sustainability of artisanal mining, but miners often are very poor and have few other options to earn a living. Illegal mining in national parks and land reserves can be especially damaging, such as the Kahuzi-Biéga National Park in the DRC and the Puinawai National Reserve in Colombia, due to the deep forest cover these places provide.[5] Coltan is mined using techniques developed for gold mining in the 1800s.[6] The work is difficult and dangerous, with workers panning for coltan in large craters in stream beds, with the average worker producing less than one kilogram of coltan a day.[citation needed]