Sumatra Copper & Gold plc announced that it has appointed Mr. Rob Gregory to the position of Chief Operating Officer (COO) effective 1 July 2016. Incumbent COO Mr. Don Harper has resigned and will complete an orderly handover of duties during July. The Board Mr. Gregory, an Australian mining engineer, is an experienced manager of mining operations in a number of jurisdictions including Indonesia, most recently as Chief Operating Officer at Medusa's Philippine operations where he was instrumental in increasing production levels and underground mine productivity. His focus will be to bolster productivity at Tembang particularly from the Belinau underground mine, the production from which is the main driver of grade delivered to the mill.