In this Monday, Jan. 30, 2017 photo, John Mayes, site manager for the Silver Peak lithium mine, looks over the mines evaporation ponds during a tour of the mine near Tonopah, Nev. (Steve Marcus /Las Vegas Sun via AP)
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In this Monday, Jan. 30, 2017 photo, John Mayes, site manager for the Silver Peak lithium mine, looks over the mines evaporation ponds during a tour of the mine near Tonopah, Nev. (Steve Marcus /Las Vegas Sun via AP)
