In this Monday, Jan. 30, 2017 photo, an evaporation pond system is shown during a tour of the Silver Peak lithium mine near Tonopah, Nev. (Steve Marcus /Las Vegas Sun via AP)
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In this Monday, Jan. 30, 2017 photo, an evaporation pond system is shown during a tour of the Silver Peak lithium mine near Tonopah, Nev. (Steve Marcus /Las Vegas Sun via AP)
