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A zone of mineral-bound ammonium that extends over 10 km in length has been discovered in the southern half of the Cedar Mountains in Esmeralda County, Nevada. The zone initially was depicted on a Landsat Thematic Mapper image and is centered on an unnamed 6931 ft (2113 m) peak composed of two Tertiary silicic ash-flow tuffs. The zone as mapped by an airborne scanner extends in a narrow swath along the west side of the Cedar Mountains through Tertiary volcaniclastic rocks and sediments and appears to be structurally controlled. Ammonium concentrations of a few samples associated with the spectral anomalies are near 0.20 wt % (NH^) 20