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On your way south to Puerto Peñasco (or Rocky Point), the large dune field to your right is what used to be the interior of the Grand Canyon, brought to rest here by the once-mighty Colorado River.

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The Army Corps of Engineers today issued the Clean Water Act permit for the $1.9 billion open-pit mine to be built in the Santa Ritas near Tucson. It will be the country’s third-largest copper mine, accounting for 10 percent of annual U.S. copper production, the mining company says.