SHANGHAI, Apr. 28 (SMM) – In Shanghai physical tin market, mainstream traded prices were little changed at RMB 139,500-141,000/mt over the first half of the week, but followed LME tin up last Thursday. Prices rose to RMB 141,500-142,500/mt by Friday. Goods available in the market consisted largely of those from Yunnan. Traders showed high buying interest, but downstream producers in general stayed out of the market. Yunnan Tin Group and Yunheng Tin raised ex-works prices to RMB 143,000/mt.