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Steve Landeen, Deseret News
Crews battle the Black Mountain Fire in Beaver County, Wednesday, July 3, 2013.

MINERSVILLE, Beaver County — Despite growing by more than 500 acres Thursday, the Black Mountain Fire was 35 percent contained by 8:30 p.m. and fire officials said crews were making good progress.

"It's actually coming along quite well," said Nick Howell, Bureau of Land Management fire mitigation and education specialist. "It hasn't made any significant turns this way."

Despite thunderstorms building around the fire Thursday evening, fire officials say there was no measurable amount of water at the fire.

The Black Mountain Fire is burning about 3 miles southeast of Minersville in Beaver and Iron counties. As of 8:30 p.m. Thursday, the fire had burned 4,531 acres and was threatening one cabin.

No evacuations have been ordered, but the Chalk Hollow, Maple Springs, Black Mountain and Camel Hollow roads remain closed.

There were 282 firefighters on the scene Thursday, with air tankers laying retardant on the lines. On Wednesday, two firefighters were transported to the hospital for dehydration and heat exhaustion, but both are expected to make a full recovery.