OLG closing Gateway Casino Sarnia The owner of Hiawatha Horse Park in Sarnia says he'll have to figure out a way to operate again without slots on site. Try refreshing your browser, or OLG closing Gateway Casino Sarnia Back to video We apologize, but this video has failed to load. “I am writing to formally notify you that the lease agreement for Gateway Casino Sarnia will terminate on March 31, 2026, and will not be extended,” Ontario Lottery and Gaming Corp. (OLG) senior vice-president Michelle Eaton said in a letter to Sarnia chief administrator Chris Carter. Article content “We are committed to working with the property owners and the casino service provider to ensure an efficient and timely decommissioning process for Gateway Casino Sarnia,” Eaton said. The city has received $28.1 million since the horse park slots opened in 1999, OLG said earlier this year.