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U.S. & World

Federal study finds mercury in trout caught in three Grand Canyon creeks

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  • A Chem Engineer Pocatello, ID
    April 25, 2014 12:29 a.m.

    I find it odd that the most likely explanation is not even mentioned. There are naturally-occurring deposits of cinnabar (mercuric sulfide) throughout the southwestern U.S. - and with the Grand Canyon cutting through so many layers of strata - I can easily see a small vein of cinnabar being exposed.