In this photo taken March 28, 2009, a continuous mining machine breaks through a wall of coal at the Horizon Coal Mine outside Helper, Utah. Horizon is considered one of Utah several deep coal mines that have come under more federal regulation in recent years. AP Photo logo AP Photo 32 months ago

In this photo taken March 28, 2009, a continuous mining machine breaks through a wall of coal at the Horizon Coal Mine outside Helper, Utah. Horizon is considered one of Utah several deep coal mines that have come under more federal regulation in recent years.

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