SHANGHAI, Nov. 6 (SMM) – Spot copper in Shanghai was quoted at a contango of RMB 0-80/mt and a backwardation of RMB 0-20/mt over SHFE 1311 copper contract on Wednesday. Traded prices were RMB 51,500-51,600/mt for standard-quality copper, and RMB 51,550-51,750/mt for high-quality copper. Some traders bought aggressively in the morning, helping narrow contango. High-quality copper was offered at a backwardation. Downstream producers stepped in once prices fell back during the second trading session.