Update 06/05/18: On Thursday, May 31, 2018, the Shawnee Tribe held a ground breaking ceremony for its 42,000-square-foot Golden Mesa Casino located on 107 acres southwest of Guymon and slated to open in 2019. Update02/20/19 : The casino is slated to open late June/early July. Betting on sports futures, props and lay bets.