coltan mining and processing
Coltan-Mining and Processing, Technology, Production, Global .Coltan is mined through a fairly primitive process similar to how gold was mined in California during the 1800s.Coltan mining is very well paid in Congo terms.coltan mining and processing,Uganda alluvial coltan processing plantMar 5, 2015 . Alluvial coltan processing plant. For more . How Copper is Mined and Refined: A Story Of Copper 1951 US Bureau of Mines - Duration: 33:35.