SHANGHAI, Apr. 7 (SMM) – SHFE 1506 zinc contract prices opened at RMB 16,160/mt Thursday, then inched up to and held stable at RMB 16,200/mt, and closed the day at RMB 16,215/mt, up RMB 90/mt or 0.56%. Trading volumes were up 10,956 to 69,500 lots, and total positions increased 3,084 to 136,226. SHFE 1506 zinc contract prices should rise this evening.