Two years ago the San Pedro Valley desert east of Arizona's Santa Catalina Mountains was inhabited by little more than coyotes and cactus. But after Magma Copper Co. proved up the nation's biggest copper deposit beneath the San Pedro Valley floor, the face of the desert changed. Earth movers terraced the rimrock into 1,500 homesites, bulldozers crunched over thousands of acres to carve out winding avenues, parks, shopping centers, a community swimming pool for the new town of San Manuel (TIME COLOR PAGES, July 25). To house Magma's workers. Builder Del Webb...
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