rwanda was the world s rd largest coltan producer in behind dr congo and brazil rwandan coltan mines are believed to produce the world s best quality coltan reaching up to tao statista factsonrwanda rwot
Rwanda was the world s rd largest Coltan producer in behind DR Congo and Brazil Rwandan coltan mines are believed to produce the world s best quality coltan reaching up to TaO STATISTA FactsOnRwanda RwOT