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Emissions
Emissions rose 22 percent in 2011, EPA report details
Mining companies are trying to manage the problems with tailings, such as these at the Asarco mine near Green Valley. Among the procedures Asarco is using to control dust is spraying additives onto tailings to create a crust that's less likely to blow off.
Toxic releases by Arizona mines increasing
Activity at Arizona's mines is surging, and so is the release of toxic materials.
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