SHANGHAI, Jul. 30 (SMM) – Spot copper in Shanghai was quoted at a premium of RMB 150-350/mt over SHFE 1308 copper contract prices on Tuesday. Traded prices for standard-quality copper were between RMB 49,950-50,080/mt, and RMB 50,080-50,250/mt for high-quality copper. SHFE copper prices were mired. Cargo holders refused to cut offers, depressing buying interest of speculators. Downstream producers held to the sidelines after large-scale restocking yesterday, leaving market quiet.