SHANGHAI, Aug. 12 (SMM) –Spot copper offers were quoted between discounts of negative RMB 80-40/mt today. Trade prices for standard-quality copper were between RMB 67,080-67,150/mt, and RMB 67,150-67,250/mt for high-quality copper. Due to a continuously slight rebound in SHFE copper prices, downstream producers increased purchases, while some speculators also made purchases in the morning session for high-quality copper given slight discounts, resulting in brisk market transactions.