An 800-acre fire that burned a summer home and was threatening others was being battled by 120 firefighters Friday and is not expected to be controlled until Sunday night.

The fire, on Orange Mountain, near Duchesne, is burning in heavy pinion and juniper trees, said Gary Cornell, Utah Division of State Lands and Forestry fire management officer."Summer homes are scattered all through the fire area and adjacent to the fire area," Cornell said. Wind and low-moisture fuels in the area were expected to hamper the four crews working on the fire line.

Firefighters from the Forest Service, Bureau of Land Management, Bureau of Indian Affairs and Duchesne, Wasatch and Uintah counties were battling the fire with six bulldozers and an air tanker. A second air tanker was being held in Salt Lake City on standby, Cornell said.

"To date we're aware of loss of only one structure," he said, but other summer homes are scattered through the burning timber, creating a sizeable risk that other homes could be destroyed before the fire is controlled. "It's certainly a possibility, but one never knows at this stage of the game."

The fire, started Wednesday by lightning along with 11 other fires in the area, had consumed 120 acres by Thursday. Crews were able to extinguish 10 of the lightning fires by the end of the day Wednesday.

The other fire in the area, on Black Tail Ridge, was controlled at 6 p.m. Thursday after it had consumed 250 acres of pinion and juniper. No structures were damaged there, but wildlife habitat and a watershed area were damaged, Cornell said.