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A Utah County board is again waiting to make a decision on a Snowbird ski resort expansion into American Fork Canyon following a contentious meeting about whether the project could stir up old mine waste.

The Daily Herald in Provo reports that Sheriff Jim Tracy once threatened to clear the room on Thursday if the crowd at the Utah County Board of Adjustment meeting didn't settle down.

Snowbird Ski and Summer Resort needs approval to build install ski towers, a zip line and other ski facilities in Mary Ellen Gulch.

The board postponed a decision until April 7 after American Fork officials said they need more time to study whether the project could pollute the city's water supply.

Opponents have also said they're worried about whether people could still reach public roads.