SHANGHAI, Jun. 23 (SMM) –SHFE 1709 tin experienced a roller coaster ride on Friday, diving to RMB 143,160/mt in the morning before jumping suddenly at the tail of the day. Finally, the most active contract ended up RMB 280/mt or 0.19% at RMB 144,440/mt. Trading volumes decreased 5,122 lots to 14,338 lots, and positions were down 708 lots to 18,970 lots. SHFE 1709 tin will challenge resistance at RMB 146,000/mt in the short term.