The Arizona Transition Zone, sometimes referred to as the Central Highlands, is a northwest-trending belt or escarpment in the middle of the state that separates the Colorado Plateau to the north from ...

Arizona has a decades-long unchallenged reputation as a copper state, but a recent ranking suggests more mineral wealth is hiding beneath its deserts. The study, published by Bullion dealer SD Bullion ...

As the Arizona Trail winds past the proposed Oak Flat copper mine, the search for climate solutions takes on new meaning.

Travelers — many inspired by Jacob Waltz — headed to Arizona in search of gold. The Superstition Mountains loom in the background of a historical marker honoring their route. (Joe Duhownik/Courthouse ...

The United States Bureau of Land Management approved a new gold mine project near Wickenburg. The project raised environmental concerns regarding water usage, potential groundwater contamination and ...

Over seven weeks this fall, Arizona Republic climate reporter Joan Meiners is biking the length of the 850-mile Arizona Trail from Utah to Mexico to report on how climate change is affecting the state ...