бөмбөлөгт тээрэм нунтаглалтыг хэрхэн сайжруулах
хямдхан нунтаглах бөмбөг. дахь coltan ордууд. La guerre du coltan en RDC. Jul 22 2013· The media first began reporting that warlords in the DRC were profiting from coltan in 2001 But once Congolese coltan flooded the market the price returned to pre-boom levels Most of the world s coltan tantalite comes from modern large-scale mines which abide by safety …