A wildfire burned about 1,500 acres of grass, sage, pinyon and juniper Friday in a remote section of Tooele County.

The 11:30 a.m. blaze sent up a pillar of smoke that could be seen in Salt Lake County, casting a haze that lingered much of the afternoon. It was 50 percent contained late Friday, said Kathy Jo Pollock of the Salt Lake Inter-agency Fire Center.The fire was expected to be controlled by Sunday night, Pollock said.

The blaze "was definitely human-caused," Pollock said. "But we're not sure as to what caused it."

The blaze, dubbed the Faust fire, started in a grass range about 10 miles southeast of Tooele Army Depot, burning on both sides of U-73, Pollock said.

By late Friday, the blaze had halted on the west side of the freeway but continued on the east, where green, wet trees helped slow its movement, Pollock said.

Between 50 and 80 people from several state and local fire agencies were battling the Faust fire Friday.

Two air tankers, a helicopter and about 24 engines were also enlisted, Pollock said.

No structures were threatened.