Maps showing anomalous concentrations of zinc, silver, antimony, manganese, barium and strontium in stream sediment and heavy-mineral concentrate from parts of the Ajo and Lukeville 1 degree by 2 degrees quadrangles, Arizona

This map is part of a folio of maps of the Ajo and Lukeville 1 degree x 2 degrees quadrangles, Arizona, prepared under the Conterminous United States Mineral Assessment Program. Other publications in this folio include U.S. Geological Survey Open-File Reports 82-419 (Barton and others, 1982), 82-599 (Klein, 1982), and 830734 (Theobald and Barton, 1983), and Miscellaneous Field Studies Maps MF-1834-A (Peterson and Tosdal, 1986), MF-1834-B (Peterson and others, 1987), MF-1834-C (Theobald and Barton, 1987), and MF-1834-D (Theobald and Barton, 1988). Open-File Reports 82-419 and 83-734 constitute the basic data and initial interpretation on which this discussion is predicated. MF-1834-C and D show the distributions of anomalous concentrations of copper, lead, molybdenum, bismuth, and tungsten.