SHANGHAI, Jun. 28 (SMM) – Spot copper in Shanghai was offered at a discount of RMB 80-200/mt over SHFE 1307 copper contract prices on Friday. Traded prices for standard-quality copper were between RMB 48,770-49,050/mt, and RMB 48,830-49,170/mt for high-quality copper. Cargo holders sold at greater discount to generate cash on the last trading day of June, but middlemen and downstream producers refrained from buying against tight liquidity, depressing overall trading.