SHANGHAI, Apr. 17 (SMM) – In Shanghai spot tin market, trading activity picked up slightly. This allowed mainstream traded prices to stabilize between RMB 111,500-113,500/mt on Thursday. China Tin Group shut down its Ausmelt furnace in Laibin, Guangxi for maintenance on April 16, and the maintenance will last one month. But this news did not inject upward momentum to tin prices.