Ancient oak trees rise above gigantic boulders scattered across a high desert mesa in Arizona’s Tonto National Forest. This ...

Beneath this biologically rich landscape, home to a variety of dry-land species including the endangered hedgehog cacti and ...

Beneath this biologically rich landscape, home to a variety of dry-land species including the endangered hedgehog cacti and the ocelot wildcat, lies a rich deposit of copper, the conductive metal ...