To offset Resolution Copper’s impacts on the hallowed ground of Oak Flat, the federal government will take possession of a rare old-growth mesquite forest. But it already approved exploratory drilling for another mine nearby.By Wyatt MyskowMAMMOTH, Ariz.—On the banks of the San Pedro River lies one of the American Southwest’s few remaining old-growth mesquite bosques—a streamside forest in more than 3,000 acres of riparian ecosystem that is one of Arizona’s last intact landscapes.

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