The Long Lake project in the Athabasca Oil Sands was initiated in 2001, as a 50/50 partnership between Nexen and OPTI Canada. It was started in order to develop the Long Lake site using steam-assisted gravity drainage and OPTI's OrCrude process for on-site upgrading. Production capacity at Long Lake was estimated of bitumen per day which could be upgraded to of synthetic crude. The proved reserves at the Long Lake site are 310,000,000 bbls. In 2017, the site produced approximately of bitumen.