 The production was resumed in December 2007.The facility uses hydrogen addition to convert the bitumen from CNRL's Muskeg River Mine in the Athabasca oil sands into refinery-ready sweet, light crude oil.The Muskeg River Mine is the first commercial unit using Shell's "Enhance" froth treatment technology — a process for removing sand, fine clay and water from oil sands froth to make clean bitumen suitable for upgrading via hydrogen addition.