Insecurity around Société Minière de Bisunzu’s (SMB) coltan mine in Democratic Republic of Congo could get worse if it is cut out of supply chains following a deadly grenade attack there, the company running the mine’s mineral tracing scheme said. Up to three people were reported killed in the attack on June 23 in Kisura village, which is on an unmined part of SMB’s vast mining concession known as PE 4731.