The family of a 17-year-old boy at the center of a federal hazardous materials investigation at an Irvine home rejects the suggestion that he may have threatened public safety, according to their ...

Ajo, in western Pima County 125 miles west of Tucson, has one of Arizona’s best-known porphyry copper deposits. It enticed small mining operations by the San Francisco syndicate known as the American ...

A federal appeals court has affirmed a ruling that blocks Rosemont Copper Co.’s bid to dig a 6,500-foot-wide open pit mine in the Santa Rita Mountains about 30 miles southeast of Tucson. In a split ...