MYTON -- Utah's largest oil producer told state regulators that an explosion killed a welder who was using his torch on a crude oil storage tank at a well site.
Newfield Exploration Co. notified the Utah Division of Oil, Gas & Mining that the blast on Tuesday night was sparked by welding and the contract worker was killed, said Jim Springer, a spokesman for the state agency.
Two other people were injured, but no names have been released.
The explosion and fire occurred near rural Myton, about 100 miles east of Salt Lake City. The fire has been extinguished.
Uintah County sheriff's Cpl. Brian Fletcher confirmed that work was being done on the storage tank before the blast, but he had no other details.
Investigators were the "trying to piece everything together" and a medical examiner was removing the body of the victim, Fletcher said.
Newfield spokesman Keith Schmidt said the blast occurred during routine maintenance, killing the contract worker and leaving another person with minor injuries that didn't require medical attention.
A third victim, a company employee, is expected to recover from injuries at a Vernal hospital, he said.
"It's a tragic event. Our thoughts are with the families," Schmidt said. "We pride ourselves on a safe work environment and will be doing a full assessment of the unit."
Newfield Exploration Co., based at The Woodlands, Texas, produced 8.5 million barrels of crude oil in Utah during 2012, making it the state's top producer by far, according to drilling records.