SHANGHAI, Mar. 13 (SMM) – SHFE three-month zinc contract prices opened slightly higher and then inched up today. Discounts of #0 zinc against SHFE 1305 zinc contract prices were to RMB 190-210/mt, with traded prices between RMB 14,980-15,010/mt. #1 zinc prices were RMB 14,960-14,980/mt. SMM sources report the State Reserve Bureau plans to build 50,000 mt of zinc ingot reserves, and will invite bidding this Friday. The market took a wait-and-see attitude. Smelters continued to hold goods, while downstream buying interest was weak, keeping overall transactions quiet.