SHANGHAI, Aug. 19 (SMM) –Spot copper offers were quoted between premiums of positive RMB 150-250/mt today. Trade prices for standard-quality copper were between RMB 66,550-66,700/mt in the morning business, and RMB 66,600-66,800/mt for high-quality copper. SHFE copper prices weakly fluctuated after opening higher, but spot copper premiums failed to increase. Despite buying interest at the lows, concerns over declining copper prices and sell-off pressures were overshadowing markets, keeping market transactions cautious.