SHANGHAI, Sept. 7 (SMM) –Shanghai spot copper offers were quoted between premiums of positive RMB 0-50/mt today. Trade prices for standard-quality copper were between RMB 67,330-67,380/mt in the morning business, and RMB 67,380-67,450/mt for high-quality copper. As SHFE copper prices rebounded slightly and supply was sufficient, copper premiums were dampened. However, standard-quality copper refused to trade at discounts, narrowing its price gap with high-quality copper. Copper prices stood above RMB 67,000/mt again, but downstream producers and traders were mixed towards the outlook. Market transactions were moderate, and were mainly made by traders.