The U.S. Forest Service has approved one of the two federal permits needed for a proposed open-pit copper mine southeast of Tucson, but an opposition group vowed Wednesday to keep fighting the project.

The Arizona Court of Appeals has removed one hurdle for a proposed mine southeast of Tucson that would be the third-largest copper mine in the country.

A judge is considering an appeal aimed at overturning state regulators' decision to grant an air-quality permit for a planned copper mine in southeastern Arizona.

TUCSON ai??i?? A new report by the U.S. Forest Service offers a favorable assessment of a proposed southern Arizona mine, saying it would comply with key environmental requirements and should be approved.

TUCSON ai??i?? Opponents have failed to prove that a proposed new open pit mine near Tucson would harm groundwater supplies, an administrative judge recently ruled.

TUCSON ai??i?? Pima County authorities are poised to allow a proposed copper mine to operate along the Catalina Mountains.