Trace Element Distribution Near Jasperoids in the Weepah Spring Wilderness Study Area, Lincoln and Nye Counties, Nevada.
Mineral investigations were conducted by the Bureau of Mines to further assess the possibility of gold occurring in the northwestern part of the Weepah Spring Wilderness Study Area, Lincoln and Nye Counties, Nevada. This area was identified in a previous study by the U.S. Geological Survey and the Bureau as having a "high potential" for undiscovered deposits of disseminated gold. The Bureau collected 64 rock-chip samples, 4 from unaltered carbonate rocks to establish a local background,the rest from jasperoid outcrops, and 117 stream-sediment samples. Gold, silver, antimony, arsenic, barium, and mercury contents of the samples were evaluated statistically. All the antimony, arsenic, and barium concentrations of the stream-sediment samples were plotted and then contoured to determine if any areas of anomalously high element concentrations existed within the study area. Some of the jasperoid samples contained low gold and silver concentrations and all contained anomalously high amounts of antimony, arsenic, barium, and mercury, elements commonly associated with disseminated gold and silver deposits in Nevada. Similar treatment of the stream-sediment samples identified one area where all three elements were several times their background. Four other areas with anomalously high arsenic concentrations were also identified. The study identifies possible gold exploration targets in and near the wilderness study area.