SHANGHAI, Jun. 20 (SMM) –On Tuesday, SHFE 1709 tin opened at RMB 144,110/mt. The contract touched a low of RMB 142,950/mt, and finally ended down RMB 1,500/mt or 1.04% at RMB 143,230/mt. Trading volumes decreased 8,056 lots to 13,668 lots, and positions were unchanged at 19,834 lots. SHFE 1709 tin will test support at RMB 141,000/mt and resistance at RMB 146,000/mt in the short term.