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BOISE -- Fire investigators have now determined the cause of a fire on Sun Valley's Bald Mountain.

Investigators say a snowmaking compressor oil cooler malfunctioned.

That caused a lot of compressor oil to leak, which only intensified the fire, as did the wind that night.

Flames destroyed the top lift terminal of the Flying Squirrel Ski Lift and a communications building.

Some ski runs were closed for a while and a ski race canceled.

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