WILLISTON, N.D. -- A Utah man has died of injuries suffered in an oil rig explosion in western North Dakota.

The Mountrail County Sheriff's Office said in a statement that Jeffery Kinkaid, 29, of Nephi, Utah, died Friday. He was injured in an explosion Sept. 4 at a rig site southwest of Stanley and then airlifted to a Minnesota burn center, the Williston Herald reported.

Kinkaid worked for Denver-based Frontier Drilling at the rig site owned by Wichita, Kan.-based Slawson Exploration Co. Inc.

Frontier spokesman James Lynch said Kinkaid was transferring drilling fluid out of a 400-barrel tank when the blast happened. He suffered burns on about 90 percent of his body.

Slawson spokesman Stuart Kowalski said Kinkaid was opening the tank's lid when it exploded.

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Kinkaid had worked on the rig since January at different locations, Lynch said. He said the incident is still under investigation.