SHANGHAI, Nov. 22 (SMM) – Spot copper in Shanghai was quoted at a premium of RMB 90-190/mt over SHFE 1312 copper contract on Friday. Traded prices were RMB 50,900-50,980/mt for standard-quality copper, and RMB 50,950-51,050/mt for high-quality copper. Supply remained stable. Imported copper continued to gain favor. Traders bought spot copper while selling SHFE copper, leaving trading brisk. Downstream consumption picked up slightly before the upcoming weekend.