Mining companies have staked 185 claims within 10 miles of Yosemite National Park—close enough that cyanide and other toxic chemicals they use to separate ore from rock could run off into the Tuolumne River and the trails and wild lands that surround it—historically, mining wastes often escape into local waterways. https://secure3.convio.net/engage/site/Advocacy?cmd=display&page=UserAction&id=3979
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