By Clara Migoya /El Inde In a lot on Harshaw Avenue, off-road trucks line up in neat rows. The small town of Patagonia is seeing new activity in the nearby mountains now that South32, an Australian...

It’s not a ghost town, but it feels like one. The streets of Hayden, Arizona, are lined with boarded-up businesses — Grimebusters Laundry, Casa Rivera Restaurant, an appliance store — and...