Absaloka mine, top employer, and revenue source for the Crow Tribe, shipped its final railcar of coal early Tuesday, though operator Westmorland Mining LLC indicates closure isn't imminent.

The Verde Mining district grew to become one of the greatest copper producers in Arizona from 1883 until 1992.

Located 20 miles south of Tucson on the eastern slope of the Sierrita Mountains, the Twin Buttes Mining district dates back to the late 1800s.