SHANGHAI, Aug. 18 (SMM) –In Shanghai spot tin market, prices rose slightly in the week ending August 15 due largely to falling supply, with mainstream traded prices up to RMB 140,000-142,000/mt last Friday. Yunnan Tin group stockpiled goods in the market for its processing business, the major reason behind the falling supply. The low-end price moved higher, but the high-end price was stagnant. Downstream producers entered the market given the tight supply, but overall consumption was only modest. Yunnan Tin group held offers stable at RMB 141,500-142,000/mt, while China Tin Group and Yunnan Chengfeng Non-ferrous Metals raised offers out of optimism over the market outlook.