I occasionally trade the August mini gold contract (Symbol YG) on the ACE/CBOT. These last few days the contract has disappeared form my IB TWS and I cannot enter it (contract not available). I checked the trading calendar and the Gold contract (NYMEX) and CBOT site say the last trading day should be August 28 ... Can anyone please help ? Is the last trading day the end of JUly or something ??? (the mini silver contract for august is gone too ???)