Officers found the 40-year-old man from Fort McMurray after responding to a call about a missing person.
Police say he was buried in sand as the result of a workplace accident.
Suncor spokeswoman Sneh Seetal (sun-NAY' SEE'-tul) says a search began Sunday morning when Jerry Cooper didn't show up for a meeting and wasn't answering his radio.
She says Cooper was found submerged in an area of the sand dump — a mixture of sand and water — at the mine site's extraction area. He was pronounced dead.
Cooper had worked for Suncor for 13 years, Seetal said, adding he was a tailings operator.
She says a Suncor official has met with Cooper's family and has extended condolences to them.
Occupational health and safety officials are involved in the police investigation.