Sumatra Copper & Gold plc announced the production update from its Tembang gold-silver operation located in southern Sumatra, Indonesia. As announced on February 27, 2017, the Berenai open pit surface as defined in the original feasibility study was found to be inaccurate and included portions of backfilled and rilled material. This requirement to mine additional unscheduled waste has delayed open pit ore production from Berenai. The waste material, comprised mainly of thick mud, has proven difficult to remove particularly during the wettest period of the year. The company is reported that the mud has now been removed and normal open pit ore production has recommenced. There are 12,000 AuEq1 ounces scheduled to be mined below the current floor (RL 120m) in Stage 2 down to RL 82.5m and a further 5,600 ounces AuEq in Stage 3 down to RL 70m during the remainder of 2017.

The company provided production guidance for the quarter ending June 2017. For the period, as a result of the added challenge of removing the substantial amount of mud in the Berenai open pit and the consequential delay in ore production from Berenai, the company announced that June quarter production is expected to be significantly lower than planned and full year guidance is reduced to 40,000-50,000 oz AuEq from the previous guidance of 45,000-55,000 oz AuEq.