SHANGHAI, Aug. 17 (SMM) –Spot copper offers were quoted between premiums of positive RMB 100-200/mt today. Trade prices for standard-quality copper were between RMB 66,900-67,000/mt, and RMB 67,000-67,150/mt for high-quality copper. Due to wild changes in SHFE copper prices, spot copper offers couldn’t follow the trends, making hedge trading impossible. Premiums from cargo-holders were firm. Downstream processors were the main market participants, but uncertainty in SHFE copper prices and future prices dampened the buying interest somewhat.