SHANGHAI, Jun. 5 (SMM) – Spot copper in Shanghai was offered at a premium of RMB 0-180/mt over SHFE 1306 copper contract prices on Wednesday. Traded prices for standard-quality copper were between RMB 53,800-53,900/mt, and RMB 53,900-54,060/mt for high-quality copper. SHFE 1309 copper contract prices failed to rebound, prompting cargo holders to sell at highs for cash. Premium slid all the way down due to ample supply. Prices of high-quality copper were firm, though, especially Guixi brand. Offers of imported standard-quality copper were flat with SHFE 1306 copper contract prices towards mid-day, while hydrometallurgical copper was sold at discount. Middlemen tried to push for lower prices, while downstream producers refrained from buying at RMB 54,000/mt.