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Recent Publications

• Brady, Laura M., Gray, Floyd, Castaneda, Mario, Boltman, Mark, and Bolm, Karen Sue, 2002, Preliminary United States - Mexico Border Watershed Analysis, Twin Cities Area Of Nogales, Arizona And Nogales, Sonora: U.S. Geological Survey Open File Report: OF 02-112
• Norman, Laura M., Wissler, Craig A., Guertin, D. Phillip, and Gray, Floyd, 2002, Digital Soils Survey Map of the Patagonia Mountains, Arizona: U.S. Geological Survey Open File Report: OF 02-324.  
• Blodgett, Robert B., Moore, Thomas E., and Gray, Floyd, 2002, Stratigraphy and Paleontology of Lower Permian rocks north of Cananea, Northern Sonora, Mexico: Journal of South American Earth Science, vol. 15, p. 481-495.
• Wynn, J., Mars, J., Gray, Floyd, Shultz, A., Maldonado, F., Villasenor, F., Brady-Norman, L., 2003, Imagery and Aeromagnetic Data - Powerful Tools to Aid Reconnaissance Geological Mapping of the Sierra San Jose Mountain Range, Northern Sonora State, Mexico: Proceedings, Symposium on the Application of Geophysics to Engineering and Environmental Problems, Annual Meeting of EEGS, April 6-10, 2003, San Antonio, Texas.
• Wynn, J.C.; Gray, Floyd; Nordstrom, T.E.; Liu, Dexin; and Reed, E.V., Villaseñor, F.A., and Connert, G.A.,2003, Using analytic signal analysis on aeromagnetic data to constrain AMT inversions, Sonora San Pedro Basin, Mexico: Proceedings, Symposium on the Application of Geophysics to Engineering and Environmental Problems, Annual Meeting of EEGS, April 6-10, 2003, San Antonio, Texas.
• Gray, Floyd, Kramer, Deborah A., and Bliss, James D., 2005, Gallium and Gallium Compounds: Kirk-Othmer Encyclopedia of Chemical Technology, John Wiley & Sons, Inc. on-line version: http://www.mrw.interscience.wiley.com/kirk/articles/gallsabo.a01/frame.html
• Gray, Floyd, Kramer, Deborah A., and Bliss, James D., 2007, Gallium and Gallium Compounds: Encyclopedia of Chemical Technology, Concise, 5th Edition (ISBN 978-0-470-04748-4), 3 p.
• Gu, Ailiang, Gray, Floyd, Eastoe, Christopher, J., Norman, Laura M., Duarte, Oscar, and Long, Austin, 2007, Tracing Ground Water Input To Base flow Using Sulfate Isotopes: Ground Water,  v. 46, no. 3, pp. 502-509.
• Norman, Laura M., Gray, Floyd, Guertin, D. Phillip, and Wissler, Craig, 2008, Analysis of a Watershed Model of Soil and Waste Rock: Using GIS To Predict And Track The Fate Of Acid-Mine Drainage and Impacts On Surface Water Quality In Historic Ghost Town Of Southeast Arizona: Journal of Environmental Monitoring and Assessment, v. 145, pp. 145-157
• Balistrieri, Laurie S., Foster Andrea L., Gough, Larry P., Gray, Floyd, Rytuba, James J., and Stillings , Lisa L., 2007, Understanding Metal Pathways in Mineralized Ecosystems: U.S. Geological Survey Circular 1317, 12 p.
• Gray, Floyd , Castro-Escarrega, Jaime, and William R. Page, 2008, Geologic Map Compilation of the U.S. Mexico Border in Norman, Laura M., Hirsch, Derrick D., and Ward, A. Wesley, eds., Proceedings of a USGS Workshop on facing tomorrow's challenges along the U.S.-Mexico border; monitoring, modeling, and forecasting change within the Arizona-Sonora transboundary watersheds:  U.S. Geological Survey Circular 1322, 63 p.
• Norman, L.M., Villarreal, M.L., Wallace, C.S.A., Gil Anaya, C.Z., Diaz Arcos, Israel and Gray, Floyd, 2010, A high-resolution land-use map; Nogales, Sonora, Mexico - U.S. Geological Survey Open-File Report 2010-1156, 21 p.
• Hammarstrom, Jane M.; Robinson, Gilpin R. Jr.; Ludington, Steve; Gray, Floyd; Drenth, Benjamin J.; Cendejas-Cruz, Francisco; Espinosa, Enrique; Pérez-Segura, Efrén; Valencia-Moreno, Martín; Rodríguez-Castañeda, José Luis; Vásquez-Mendoza, Rigobert; Zürcher, Lukas, 2010, Global mineral resource assessment--porphyry copper assessment of Mexico: U.S. Geological Survey Scientific Investigations Report 2010-5090-a.
• Norman, L.M., Levick, L., Guertin, D.P., Callegary, J., Quintanar Guadarrama, J., Zulema Gil Anaya, C., Prichard, A., Gray, F., Castellanos, E., Tepezano, E., Huth, H., Vandervoet, P., Rodriguez, S., Nunez, J., Atwood, D., Patricio Olivero Granillo, G., and Octavio Gastelum Ceballos, F., 2010, Nogales flood detention study: U.S. Geological Survey Open-File Report 2010-1262, 141 p.

Chronological listing of published reports

• U.S. Geological Survey (Ashley, Banks, Bergquist, Blacet, Cannon, Creasey, Drewes, Gray, Johnson, Keith, Theodore, and Yeend, contributors), 1974, Preliminary map showing potential for copper deposits in the east half of the Tucson 2o quadrangle, Arizona:  U.S. Geological Survey, Open-File Report 74-143, scale 1:250,000.
• Page, N.J, Blair, Will, Gray, Floyd; Cannon, J.K., Grimes, D.J., and Leinz, R.W., 1977, Preliminary reconnaissance geologic map of the Wimer quadrangle, Oregon:  U.S. Geological Survey Miscellaneous Field Investigations Map MF-848, scale 1:62,500.
• Page, N.J, Johnson, M.G., Moring, Barry, Gray, Floyd, and Cannon, J.K., 1978, Preliminary reconnaissance geologic map of the Glendale quadrangle, Oregon:  U.S. Geological Survey Miscellaneous Field Investigations Map MF-78-518, scale 1:62,500.
• Page, N.J, Gray, Floyd, Cannon, J.K., Foose, Mike, Lipin, Bruce, Moring, B.C., Nicholson, S.W., Sawlan, M.G., Till, Alison, and Ziemianski, W.P., 1980, Geologic map of the Kalmiopsis Wilderness:  U.S. Geological Survey Miscellaneous Field Studies Map MF-1240A, scale 1:62,500.
• Ramp, Len, and Gray, Floyd, 1980, Sheeted dikes of the Wild Rogue Wilderness, Oregon:  Oregon Geology, v.42, no.7, p. 119-124.
• Gray, Floyd, 1980, Geology of the igneous complex at Tincup Peak, Kalmiopsis Wilderness, southwestern Oregon:  U.S. Geological Survey Open-File Report 80-1243, 92 p., map scale 1:12,000.
• Gray, Floyd, and McKee, E.H., 1981, New K-Ar dates from the Wild Rogue Wilderness, southwestern Oregon:  Isochron/West, no. 32, p. 27-29.
• Gray, Floyd, Ramp, Len, Moring, B.C., Douglas, Ian, Donahoe, James, 1982, Geology of the Wild Rogue Wilderness area, southwestern Oregon:  U.S. Geological Survey Miscellaneous Field Studies Map MF-1381-A, scale 1:48,000.
• Blair, W.N., Wong, Albert, Moring, Barry, Bernard, James, Page, N.J, and Gray, Floyd, 1981, Reconnaissance geologic map of parts of the Gold Hill, Rich, Medford, and Talent 15' quadrangle, southwestern Oregon:  U.S. Geological Survey Open-File Map 81-1076, scale 1:62,500.
• Page, N.J, Moring, Barry, Gray, Floyd, Cannon, J.C., and Blair, W.N., 1981, Reconnaissance geologic map of the Selma quadrangle, Josephine County, Oregon:  U.S. Geological Survey Miscellaneous Field Studies Map MF-1349, scale 1:62,500.
• Blakely, R.J., Page, N.J, Gray, Floyd, Senior, Lisa, and Ryan, H.F., 1983, Maps showing aeromagnetic data and interpretation for the Kalmiopsis Wilderness area, southwestern Oregon:  U.S. Geological Survey Miscellaneous Field Studies Map MF-1240-D, scale 1:62,500, 2 sheets.
• Page, N.J, Miller, M.S., Grimes, D.J., Leinz, R.W., Blakely, R.J., Lipin, B.R., Foose, M.P., and Gray, Floyd, 1982, Map showing mineral resource assessment of the Kalmiopsis Wilderness area, southwestern Oregon:  U.S. Geological Survey Miscellaneous Field Studies Map MF-1240E, scale 1:62,500.
• Gray, Floyd, and Peterson, J.A., 1982, Geochemical analyses of rock and stream sediment samples from the Wild Rogue Wilderness Area, Coos, Curry, and Douglas Counties, Oregon:  U.S. Geological Survey Open-File Report 82-186, scale 1:48,000.
• Smith, James, Page, N.J, Johnson, M.G., Moring, Barry, and Gray, Floyd, 1982, Preliminary geologic map of the Medford 1o by 2o quadrangle, Oregon and California:  U.S. Geological Survey Open-File Map 82-955, scale 1:250,000.
• Gray, Floyd, Page, N.J, Cornwall, H.F., and Hubber, Donald, 1982, Geology of the North Fork Smith River Roadless Area, Del Norte County, California:  U.S. Geological Survey Miscellaneous Field Studies Map MF-1423-A, scale 1:62,500.
• Gray, Floyd, Miller, R.J., Peterson, D.W., May, Dan, Tosdal, R.M., and Kahle, Katherine, 1982, Geology of the Growler Mountains, Pima and Maricopa Counties, Arizona:  U.S. Geological Survey Miscellaneous Field Studies Map MF-1681, scale 1:62,500.
• Peterson, J., and Gray, Floyd, 1982, Geochemical summary of rock and stream-sediment data from the Wild Rogue Wilderness, Coos and Curry Counties, southwestern Oregon:  U.S. Geological Survey Miscellaneous Field Studies Map MF-1381-B, scale 1:62,500.
• Gray, Floyd, Peterson, J.A., Carlson, R.R., Briggs, P., Haffty, Joseph, Cooley, E.F., and Page, N.J, 1982, Geochemical analyses of rock and stream-sediment samples from the North Fork Smith River Roadless Area, Del Norte County, California, and Josephine County, Oregon:  U.S. Geological Survey Open-File Report 82-976, scale 1:62,500.
• Gray, Floyd, Miller, M.S., Gaps, R.S., Peterson, J.A., Blakely, R.J., and Senior, Lisa, 1982, Mineral resource potential of the Wild Rogue Wilderness, Coos and Curry Counties, Oregon:  U.S. Geological Survey Miscellaneous Field Studies Map MF-1381-D, scale 1:48,000.
• Page, N.J, Carlson, R.R., Miller, Michael, Carlson, C.A., and Gray, Floyd, 1982, Map showing geochemical characteristics of platinum-group elements and gold in rock samples from the Kalmiopsis Wilderness, southwestern Oregon:  U.S. Geological Survey Miscellaneous Field Studies Map MF-1240-F, scale 1:62,500.
• Gray, Floyd, and Miller, M.S., 1983, Wild Rogue Wilderness, southwestern Oregon, in U.S. Geological Survey Professional Paper 1300, p. 915.
• Gray, Floyd, 1982, Geology of the igneous complex at Tincup Peak, Kalmiopsis Wilderness Area, southwestern Oregon:  Master of Science thesis, University of Massachusetts, Amherst, 135 p.
• Gray, Floyd, and Hamilton, Michael, 1983, North Fork Smith River Roadless Area, Northern California and Oregon, in  U.S. Geological Survey Professional Paper 1300, p. 313.
• Gray, Floyd and Page, N.J., and Hamilton, Michael, Buchler, A.R., and Gabby, P.N., 1983, Mineral resource potential of the North Fork Smith River Roadless Areas, Del Norte County, California and Curry and Josephine Counties, Oregon:  U.S. Geological Survey Miscellaneous Field Studies Map MF-1423-B, scale 1:62,500.
• Gray, Floyd, Miller, R.J., and Klein, Douglas, 1984, Reconnaissance geologic and aeromagnetic map of the Crater Range, Maricopa County, southwestern Arizona:  U.S. Geological Survey Miscellaneous Field Studies Map MF-1729, scale 1:62,500, 2 sheets.
• Page, N.J., Carlson, C.A., Gray, Floyd, Carlson, R.A., Briggs, P., Haffty, J., and Cooley, E.F., 1984, Geochemical characteristics of the North Fork Smith River Roadless Area, Del Norte County, California:  U.S. Geological Survey Miscellaneous Field Studies Map MF-1423-C, scale 1:62,500.
• Gray, Floyd, and Miller, R.J., 1984, K-Ar ages of volcanic rocks in the vicinity of Ajo, Pima and Maricopa Counties, Southwestern Arizona:  Isochron West,  no. 41, p. 3-6.
• Gray, Floyd, Miller, R.J., Klein, Douglas, and Soll, Lottie, 1985, Reconnaissance geologic map and accompanying aeromagnetic map of the Hat Mountain Quadrangle, Maricopa County, southwestern Arizona:  U.S. Geological Survey Open-File Report 85-138, scale 1:62,500, 2 sheets.
• Page, N.J, and Gray, Floyd, 1985, Platinum in soils and rocks from the Lower Coon Mountain Pluton, Del Norte County, California:  U.S. Geological Survey Open-File Report OF-85-149, 1 plate.
• Gray, Floyd, and Page, N.J, 1985, Geologic map of the Lower Coon Mountain Pluton, Del Norte County, California:  U.S. Geological Survey Open-File Report OF-85-148.
• Gray, Floyd, Page, N.J, Carlson, C.A., Wilson, S.A., and Carlson, R.R., 1986, Contrasting Petrology and PGE Geochemistry of zoned ultramafic intrusive suites, Klamath Mountains, California and Oregon:  Economic Geology, Special Issue:  Fourth Annual Pt Symposium, v. 81, p. 1252-1260.
• Smith, J.G., Blakely, R.J., Cannon, J.K., Gray, Floyd, Grimes, D.J., Johnson, M.G., Leinz, R.W., Moring, B.C., Page, N.J, Peterson, J.A., Singer, D.A., Smith, R.M., and Whittington, C.L., 1986, The conterminous United States mineral appraisal program:  Background information to accompany folio of geologic, geochemical, geophysical, and mineral resources maps of the Medford 1o by 2o quadrangle, Oregon and California:  U.S. Geological Survey Circular 976, 15 p.
• Peterson, J.A., Cox, D.P., and Gray, Floyd, 1985, Mineral resource assessment of the Ajo and Lukeville 1o by 2o quadrangles, Arizona:  U.S. Geological Survey Open-File Report 85-527, 77 p.
• Gray, Floyd, 1986, Platinum group element abundance in zoned ultramafic complex Klamath Mountains, Northern California:  Northwest Mining Association Newsletter (Transcription of talk at NW Mining Association, Spokane, after Director's approval, Dec. 85).
• Page, N.J, and Gray, Floyd, 1986, Descriptive model of Alaskan PGE (model 9), in  Cox, D.P., and Singer, D.A., eds., Mineral Deposit Models:  U.S. Geological Survey Bulletin 1693, p. 49-50.
• Miller, R.J., Gray, F., Hassemer, J., Detra, D.E., Briggs, P.H., and Brice, J., III, 1986, Analytical results and sample locality maps of stream-sediments heavy mineral concentrate and rock samples from the Big Horn Mountain Wilderness Study Area (AZ-020-099), Maricopa County, Arizona:  U.S. Geological Survey Open-File Report 86-184, 27 p.
• Gray, Floyd, Miller, R.J., Hassemer, Jerry, Hanna, W.F., Brice, John, III, Schreiner, R.A., 1987, Mineral resources of the Big Horn Mountain Wilderness Study Area (AZ-020-99), Maricopa County, Arizona:  U.S. Geological Survey Bulletin 1701-A, p. 14.
• Miller, R.J., Gray, Floyd, Hassemer, Jerry, Brice, John, III, and Schreiner, R.A., 1987, Mineral resources of the Lower Burro Creek Wilderness Study Area (AZ-020-060), Mohave and Yavapai Counties:  U.S. Geological Survey Bulletin 1701, 22 p.
• Peterson, J.A., Cox, D.P., and Gray, Floyd, 1987, Mineral resource assessment of the Ajo and Lukeville 1o by 2o quadrangles, Arizona:  U.S. Geological Survey Miscellaneous Field Studies Map MF-1834-B (preceded by Open-File Report #37).
• Gray, Floyd (compiler), 1988, Abstracts of the Symposium of the geology and mineral deposits of the Ajo and Lukeville 1° by 2° quadrangle, Arizona, U.S. Geological Survey Open-file report 88-217, 31 p.
• Gray, Floyd, Miller, R.J., Grubensky, Michael, Tosdal, R.M., Haxel, Gordon, Peterson, D.W., and May, D.J., 1988, Preliminary geologic map of the Ajo and Lukeville 1o x 2o quadrangle, southwestern Arizona:  U.S. Geological Survey Open-File Map 87-147, scale 1:250,000.
• Gray, Floyd, Miller, R.J., Hassemer, J.R., Knepper, D.H., Pitkin, J.A., and Hanna, W.F., 1989, Mineral resources of the Signal Mountain Wilderness Study Area, Maricopa County, Arizona:  U.S. Geological Survey Bulletin 1702-C.
• Gray, Floyd, Miller, R.J., Pitkin, J.A., Bagby, W.C., Hassemer, R.J., McCarthy, Howard, Hanna, W.F., and Lane, M.E., 1989, Mineral Resources of the Arrastra Mountain/Peoples Canyon Wilderness Study Area (AZ-020-059) La Paz, Mohave, and Yavapai Counties, Arizona:  U.S. Geological Survey Bulletin 1701-E.
• Miller, R.J., Gray, Floyd, Hassemer, J.R., Hanna, W.F., Pitkin, J.A., Hornberger, M.I., Jones, S.L., and Lane, M.E., 1989, Mineral Resources of the Eagletail Mountain Wilderness Study Area, La Paz, Maricopa and Yuma Counties, Arizona, U.S. Geological Survey Bulletin 1702-G.
• Page, Norman J, Moring, Barry C., and Gray, Floyd, 1990, Geologic map of the Chanchelulla Peak Pluton, Trinity County, California:  U.S. Geological Survey Miscellaneous Field Studies Map MF-in press, scale, 1:48,000.
• Gray, Floyd, Jachens, R.C., Miller, R.J., Turner, Robert Knepper, D.J., Pitkin, James, Keith, W.J., Mariano, John, Korseb, S.L., 1990, Mineral Resources of the Warm Springs Wilderness Study Area, Mohave County, Arizona:  U.S. Geological Survey Bulletin 1737-E.
• Gray, Floyd, Tosdal, Richard M., Peterson, Jocelyn A.,  Cox, Dennis P., Miller, Robert J., Klein, Douglas P., Theobald, Paul K., Haxel, Gordon B., Grubensky, Michael,  Raines, Gary, Barton, Harlan N., Singer, Donald A., and Eppinger, Robert G., The Conterminous United States Mineral Assessment Program:  Background information to accompany folio of geologic, geochemical, geophysical and mineral resources maps of the Ajo and Lukeville 1° by 2° Quadrangle, Arizona: USGS Circular 1082, 27 p.
• Gray, Floyd, Griscom, Andrew, Nowlan, Gary A.,  Raines, Gary L., Hodges, Carroll A., and Huber, Donald F., 1989, Planning Document for the Mineral Resource Assessment of the Needles 1° by 2° Quadrangle, California and Arizona:  U.S. Geological Survey Administrative Report, April 1989, 273 p., 23 plates, scale 1:250,000.
• Gray, Floyd, Harrison, Mary, Huber, D.F., 1989, Geology and mineral resources of the Kingman Resource Area, West-Central Arizona:  U.S. Geological Survey Administrative Report, 1989 (submitted to Kingman Resource Area:  BLM Management situation analysis - Resource Management Plan, 1990 resulting from 2-month TDY mto Kingman, AZ).
• Gray, Floyd, Jachens, Robert C. Miller, Robert Turner, Robert C., Livo, Eric K., Knepper, Daniel H.Jr., Almquist, Carl C., and Mariano, John, 1989, Mineral Resources of the Mount Nutt Wilderness study areas Mohave Country, Arizona:  U.S. Geological Survey Bulletin 1737-D.
• Gray, Floyd, and Wynn, J.C., 1990, Summary of geology, structure, geophysics, preliminary mineral resource potential and recommendations for Sierra Verdum, subzone II, Bolivar State, Venezuela; Internal Adminstrative Report to TECMIN, 21p., map scale 1:25,000.
• Gray, Floyd, 1991, Preliminary field reports on geology, instructions and recommendation for the El Manteco area, Western Bolivar State, Venezuela:  Internal Adminstrative Report to TECMIN, 10p.
• Gray, F.,  1991, Geological Survey Activities:  Venezuelan Advisory Group Annual Report 1990:  U.S. Geological Survey Administrative report, 31 p.
• Wynn, J.C., Gray, F., and Page, N.,J, 1991, Introduction: Venezuelan Assessment project folio 7p. in Geology and Mineral Resource Assessment of the Venezuelan Guayana shield by U.S. Geological Survey and Tecnica Minera  CA., USGS Administrative report 151 map scale 1:1,000,000, 5 plates.
• Orris, G.J., Page, N. J, Bolm, K.S., Gray, F., Brooks, Mines, prospects, and occurrences of the Venezuelan Guayana Shield: US Geological Survey and Tecnica Minera  CA., USGS Administrative report 151 map scale 1:1,000,000, 5 plates.
• Gray, F., and Orris, G.J., Diamond placers, 4 p., in  Geology and Mineral Resource Assessment of the Venezuelan Guayana shield by U.S. Geological Survey and Tecnica Minera  CA., USGS Administrative report 151 map scale 1:1,000,000, 5 plates.
• Gray, F., and Page, N.J, Synorogenic-Synvolcanic nickel, copper deposits and related platinum deposits, 1991, 2 p. in  Geology and Mineral Resource Assessment of the Venezuelan Guayana shield by U.S. Geological Survey and Tecnica Minera  CA., USGS Administrative Report, 151 p., map scale 1:1,000,000, 5 plates.
• Gray, F., 1991, Diamond-bearing kimberlite pipes, 3 p., in  Geology and Mineral Resource Assessment of the Venezuelan Guayana shield by U.S. Geological Survey and Tecnica Minera  CA., USGS Administrative Report, 151 p., map scale 1:1,000,000, 5 plates.
• Gray, F., 1991, Laterite type bauxite deposits, 5 p. in  Geology and Mineral Resource Assessment of the Venezuelan Guayana shield by U.S. Geological Survey and Tecnica Minera  CA., USGS Administrative Report, 151 p., map scale 1:1,000,000, 5 plates.
• Orris, G.J., and Gray, F., 1991, Residual kaolin, 2 p. in  Geology and Mineral Resource Assessment of the Venezuelan Guayana shield by U.S. Geological Survey and Tecnica Minera  CA., USGS Administrative Report, 151 p., map scale 1:1,000,000, 5 plates.
• Gray, F., 1992, Report on reconnaissance look at the Las Cristinas lode gold deposits:  Observations for a new deposit model: Internal Adminstrative Report to TECMIN, 23 p.
• Gray, F., 1992, Geological Survey activities:  Venezuelan advisory groups annual report 1991: U.S. Geological Survey Administrative report April 1992, 28 p.
• Page, Norman J, Gray, Floyd, and Griscom, Andrew, 1990, Petrology, Mineralogy, and geochemistry of the Lower Coon Mountain pluton, northern California with respect to distribution of platinum-group elements:  U.S. Geological Survey Bulletin 2014, 47 p.
• Cox, Dennis P., Gray, F., Acosta, Juan, Stewart, John H., Arespón, Brooks, W.E., Franco, Luis, Salazar, Edixon, Lopez, Yolanda, 1993, Geologic, map of the Guri and southern part of the Tucupita 2oX3o quadrangles, Bolivar State, Venezuela:  U.S. Geological Survey Miscellaneous Field Studies Map MF-2242, scale 1:500,000.
• Orris, G.J., Bolm, K.S., Carbonaro, Marguerite, Gray, Floyd, Long, K.R., Page, N.J., Staude, J.M. G., and Wells, Tina, 1993, Distribution of mineral deposits in the United States-Mexico border region: U.S. Geological Survey Open-File Report 93-532, 29 p.
• Orris, G.J., Gray, Floyd, Long, K.R., Page, N.J., Staude, J.G., and Bolm, K.S., 1994, Mineral resources and economics of the United States-Mexico border region, in Carter, L.M.H., Toth, M.I., and Day, W.C., USGS research on mineral resources, 1994; Part A, Program and abstracts: U.S. Geological Survey Circular C 1103-A, p. 73-74.
• Orris, G.J., Page, N.J, Staude J-M.G., Bolm, K.S., Carbonaro, Marguerite, Gray, Floyd, and Long, K.R., 1993, Nonfuel mineral resource in the United States - Mexico border region--A progress report on information available from the Center for Inter-American Mineral Resource Investigations (CIMRI):  U.S. Geological Survey Circular 1098, 19 p.
• U.S. Geological Survey and Corporación Venezolana de Guayana, Técnica Minera, C.A, 1993, Geology and mineral resources assessment of the Venezuelan Guayana Shield:  U.S. Geological Survey, Bulletin 2062, 99 p. Includes:
  • Wynn, J.C., Gray,Floyd, and Page, Norman J, , Introduction, in ... p. 3. 
  • Orris, G.J., Page,Norman J, Bolm, Karen Sue, Gray, Floyd, Brooks, William E., Carbonaro, Margarite M., and Kibbe, Richard, 1993, Mines, prospects, and occurrences of the Venezuelan Guayana Shield, in ... p. 29.
  • Gray,Floyd, Cox, Dennis P., G.J., Orris, Page, Norman J, Wynn, Jeffrey C., Brooks, William E., and Bliss, J.D., 1993, Mineral Resource Assessment of the Venezuelan Guayana Shield, in ... p. 55.
  • Cox, Dennis P., Page, Norman J, and Gray, Floyd, 1993, Algoma and Supeior-Type Iron Deposits, in ... p. 58.
  • Gray, Floyd, Page, Norman J, 1993, Sedimentay Manganese Deposits, in ... p. 61.
  • Gray, Floyd, Page, Norman J, 1993, Synorogenic-Synvolcanic Nickel-Copper Deposits and Related Platinum Deposits,  in ... p. 70.
  • Gray, Floyd, 1993, Thorite-Rare Earth Element Veins, in ... p. 75.
  • Gray, Floyd, 1993, Diamond-Bearing Kimberlite Pipes, in ... p. 75.
  • Gray, Floyd, 1993, Laterite-Type Bauxite Deposits, in ... p. 82.
  • Orris, G.J., and Gray, Floyd, Residual Kaolin Deposits, in ... p. 84.
  • Gray, Floyd, and Orris, G.J., 1993, Placer Diamond, in ... p. 86.
  • Brooks, William, E., and Gray, Floyd, 1993, Tin-(Rare Earth Element, Niobium-Tantalum) Placers, in ... p.88.

  PLATES:

  • Schruben, Paul G., Gray, Floyd, Wynn, Jeffrey C., 1993, Map showing selected geographic features of the Venezuelan Guayana Shield, in ...  Plate 1.
  • Wynn, Jeffrey C., Cox, Dennis P., Gray, Floyd, 1993, Geologic and tectonic map of the Venezuelan Guayana Shield, in ... Plate 2.
  • Page, Norman J, Orris, G.J., Gray, Floyd, and Bolm, Karen S., 1993, Map showing distribution of mines and mineral occurrences in the Venezuelan Guayana Shield, in ... Plate 5.
  • Page, Norman J, Gray, Floyd, and Bolm, Karen S., 1993, Map showing distribution of mineral occurrences in northeastern South America, in ... Plate 6.
  • Gray, Floyd, Page, Norman J, Cox, Dennis P., Orris, G.J., Wynn, Jeffrey, C., and Brooks, William E., 1993, Map showing permissive domains for Algoma iron deposits, sedimentary manganese deposits, low-sulfide gold-quartz veins, tin greisen deposits, porphyry copper deposits, and volcanic-hosted magnetic deposits in the Venezuelan Guayana Shield, in ... Plate 7.
  • Orris, G.J., Gray, Floyd, Cox, Dennis P., Page, Norman J, Brooks, William E., and Wynn, Jeffrey C., 1993, Map showing permissive domains for Kuroko-type massive sulfide deposits, synorogenic-synvolcanic nickel-copper deposits and related platinum deposits, carbonatite deposits, diamond-bearing kimberlite pipes, and sedimentary kaolin deposits, in ... Plate 8.
• Stimac, J.C, Richard, S.M., Reynolds, S.J., Capps, R.C., Kortemeier, C.P., Grubensky, M.J., Allen, G.B., Gray, Floyd, Miller, R.J., 1994, Geologic map and cross sections of the Big Horn and Belmont Mountains, West-Central Arizona: Arizona Geological Survey Open-File Report 94-15, scale 1:50,000.
• Wynn, J.C, Olmore, S.D., Mendoza, Vicente, Haydée, Rincón, García, Andrés, Rivero, Nelson, Rendón, Inés, Gray, Floyd, Marcano, Iris, Lugo, Elis, and Schruben, Paul, 1994, Geologic map of the Venezuela Part of the Piedra de Cocuy 2o X 3o Quadrangle, Amazonas Federal Territory, Venezuela: U.S. Geological Survey Miscellaneous Field Stidies Map MF-2243, scale 1:500,000.
• DOI, US Geological Survey, 1994, Fact Sheet, U.S. Geological Survey Minerals Data Base: US Mexico Border Region, 2 p. (generated by CIMRI group)
• Gough, L.P., and Gray, Floyd, 1995, USGS Collaborates with U.S. Forest Service on Studies of Mining and Environmental Mercury in Venezuela: U.S. Geological Survey Yearbook 1994, pp. 88-91.
• Gray, Floyd., Nuñez, Fernando, J., Wynn, Jeffrey C., Sidder, Gary B., Davila, Freddy., and Baiz, A., 1995, Geology and Geophysics of Sierra Verdun-Cerro Piedra del Supamo Area, Estado Bolivar, Venezuela, in  Sidder, Gary B., Garcia, Adres E., and Stoeser, Judith W.,eds., Geology and Mineral Deposits of the Venezuelan Guayana Shield: U.S. Geological Survey Bulletin 2124, p.F1-F19.
• DOI, US Geological Survey, 1996, Programs in Arizona: Fact Sheet - FS-003-96, 4 p.  (WRD and SWFO, includes my input on two MRSP tasks/projects).
• Schruben, Paul G., Wynn, Jeffrey C., Gray, Floyd, Cox, Dennis P., Stewart, John H., Brooks, William E., 1997, Geology and Resource Assessment of the Guayana Shield At 1:500,000 –scale: U.S. Geological Survey Digital Data Series 46.
• Houser, Brenda B., Gettings, M. E., Bultman, M.W., Gray, Floyd, Caruthers, Kerry, and Hirschberg, 1999, Field Trip guide to selected studies of the Southwest Mineral and Environmental Investigations Project in southeastern Arizona: U.S. Geological Survey Open-File Report 99-544.
• Gray, Floyd, Wirt, Laurie, Caruthers, Kerry, Gu, Ailang, Velez, Carlos, Hirschberg, Douglas, and Bolm, Karen, 2000, Transport and fate of Zn and Cu rich, low pH water in surface and ground water from porphyry copper and related ore deposits, Basin and Range Province, southeastern Arizona: Proceedings, Fifth International Conference on Acid Rock Drainage (ICARD), May 21-24, Denver, CO., v. 1, p. 411-430.
• Brady, Laura M., Gray, Floyd, Wissler, Craig and Guertin, Phillip, 2000, GIS Analysis of Spatial Variability of Contaminated Watershed Components in a Historically Mined Region, Arizona: Proceedings, 20th Annual ESRI International User Conference, June 26-30, San Diego, California, 14 p. (copy on World Wide Web server).
• Dohrenwend, John C., Gray, Floyd, and Miller, Robert J., 2000, Processed Thematic Mapper Satellite Imagery for Selected Areas Within the U.S. – Mexico Borderlands: U.S. Geological Survey Digital Open File Report: OF00-309, 3 CD set.

Abstracts

• Ailiang Gu, Floyd Gray, Christopher J. Eastoe, and Laura Norman, 2002, Chemical and isotopic composition of groundwater and surface water, with emphasis on sources of sulfate and base flow in Sonoita Creek near the Town of Patagonia, Santa Cruz County, Arizona. EOS, Trans. 83(47) AGU, Fall Meeting Suppl. Abstract H21A-0790.
• Wynn, Jeffrey, C., Gray, Floyd, Nordstrom, T.,E., Liu, Dexin, Reed, E.V., Villaseñor, Felix, A., and Connard, Gerry, 2003, Using Analytic Signal Analysis On Aeromagnetic Data To Constrain Amt Inversions, Sonora San Pedro Basin, Mexico: Proceedings --Symposium on the Application of Geophysics to Engineering and Environmental Problems (SAGEEP), April 6-10, 2003, San Antonio, Tx,
• Page, William R., Gray, Floyd, Blodgett, Robert B., Maldonado, Florian, Miller, Robert J., and Jamie-Ruiz, Rafael, 2003, Mesozoic-Cenozoic Tectonic Evolution of the Northern Sierra Los Ajos, Sonora, Mexico: Abstracts with Programs, Geological Society of America, Cordilleran Section, April 1-3, Puerto Vallarta, Mexico, vol. 35, no. 4, p.70
• Jaramillo-Nieves, Lorna G., Gray,  Floyd, 2003, Remote Sensing Evaluation of Element Dispersion Characteristics of Porphyry Copper Deposits in the Silver Bell Mountains, Arizona: Abstracts with Programs, Geological Society of America, Cordilleran Section, April 1-3, Puerto Vallarta, Mexico, vol. 35, no. 4,p. 60.
• King, Trude and Gray, Floyd, 2004, Mapping Mineral Distribution Patterns Related to Erosion, Alluvial Transport, and Soil Development Adjacent to the Santa Cruz River in Southern Arizona, USA: 32nd International Geologic Congress Abstracts, Florence, Italy, August 21-28, p. 302.
• Gray, Floyd, Gu, Ailiang, Bliss, James, Oscar Duarte, Norman, Laura, Hirschberg, Douglas, and Ashton, Kelly, 2004, Two Examples Of Geochemical Processes From Abandoned Mine Lands In The Patagonia Mountains:  End-Members For Modeling Of Metals Dispersion In Semi-Arid Mountain Watersheds?: Arizona Geological Society monthly meeting, June 2004, Tucson, AZ.
• Gray, Floyd, Page, William R., Wynn, Jeffrey C., Callegary, James, Maldonado, Florián, Poole, Don, Miller Robert, J., Villaseñor, Félix, and Norman, Laura, 2004, Integration of Multispectral Imagery with Aeomagnetic and Geologic Map Data to Understand the Tectonic Framework of the San Pedro River Headwaters, Sonora, Mexico: VI Seminario Minero International, Sonora, October 19 –23, 2004, Hermosillo, Sonora,Libro de Resúmenes, p.20-21.
• Pool, Don R., Gray, Floyd, and Callegary, 2005, Geological and Geophysical Surveys to Infer the Structure of the Upper San Pedro River Basin, Sonora, Mexico for Use in a Ground-Water-Flow Model: Eos Trans. American Geophysical Union, 86(18), Joint Assem. Suppl.. Abstract H21C-04.
• Gray, Floyd, Page, William R., Kleinkopf, Merlin D., Pool, Donald R., Callegary, James, Wynn, Jeffrey C., Maldonado, Florian, and, Robert J., 2005, Geological And Geophysical Studies Of The Headwaters Of The San Pedro River In Northern Sonora, Mexico: Geological Society of America, Annual Meeting, October 16-19, Salt Lake City, vol. 35, no. 4,p. 60.
• Gettings, M.E., Bultman, M.W., Gray, Floyd, and Mossotti, Victor, 2006, Summary Results of the Complex Systems Analysis of Southwest Basins Project-Seven Examples: Proceedings of the all USGS Modeling Conference, March 31, Denver, Colorado.
• Gray, Floyd, Page, William R., Norman, Laura, M., Castro Escarrega, Jesus J., Parcher, Jean, and Gass, Leila, 2006, Geologic Framework Studies and Geospatial Analysis of Change in Support of Hydrologic Modeling and Environmental Health Studies in the U.S. –Mexico Border Region: Proceedings of the 5th European Congress on Regional Geological Cartography and Information Systems-Earth and Water, June 13-16, Barcelona, Catalonia, Spain, Vol. 1, p. 96-98.
• Bultman, M.W.,  Gray, Floyd, Fleming, J.B., Callegary, James, and Kleinkopf, M. Dean, 2006, Transient Electromagnetic Study of Basin Fill Sediments, Upper San Pedro Basin, Mexico: American Geophysical Union Fall Meeting, San Francisco, December 10-14, 2007.
• Castro Escarrega, Jesus Jaime, Gray, Floyd, Salinas Prieto, Juan Carlos, 2007, Avance Cartografico En Escala 1:250,000 En La Frontera Mexico-USA; XXVII Annual Mining Congress, Veracuz, Mexico, October 10-15, 2007.
• Steve Ludington, Hammarstrom, Jane, Robinson, Gilpin, Gray, Floyd, Vélez-Lopez, Julio, Salinas-Prieto, Juan Carlos, Alba, Hector, Cendejas-Cruz, Francisco, Espinosa, Enrique, Valencia-Moreno, Martín, Rodriquez- Castañeda, José Luis, Zurcher, Lukas, 2008,  Mineral Resource Assessment using digital geospatial data—Porphyry Copper Deposits in Mexico: 33rd International Geological Congress, Oslo, Norway, August 6-14th, 2008.
• Gray, Floyd, Hammarstrom, Jane, Ludington, Steve, Robinson, Gilpin, Espinosa, Enrique, Cendejas-Cruz, Francisco, Valencia-Moreno, Rodriquez- Castañeda, José Luis, Martín, Pérez-Segura, Efren, and Zürcher, Lukas, 2008, Preliminary Results of a Quantitative Mineral Resource Assessment of Undiscovered Porphyry Copper Resources in Mexico: VIII Seminario Minero International Sonora, Hermosillo, Mexico, October 21-25, 2008.
• Norman, Laura, Gray, Floyd, Callegary, James, Van Riper, Charles, Fontaine, Joseph J., and Gartner, Anne, 2008, Investigation of the Transboundary Upper Santa Cruz Basin: National Ground Water Association 2009 Ground Water Summit, Tucson, Arizona, April 19-23, 2009
• Norman, Laura M., Callegary, James, van Riper III, Charles, Gray, Floyd, Paretti, Nicholas V. and Villarreal, Miguel, 2009, The Border Environmental Health Initiative:  Investigation of the Transboundary Santa Cruz Watershed [abs.]: 2009 AGU Fall Meeting, December 14–18,San Francisco, California.
• Norman, Laura M., Callegary, James, Gray, Floyd, van Riper, Charles, Fontaine, Joseph J., and Gartner, Anne, 2009, The Border Environmental Health Initiative: Investigation of the Transboundary Upper Santa Cruz Basin [abs.]: 2009 Ground Water Summit, April 19-23, 2009, Tucson, AZ.
• Norman , Laura, Tallent-Halsell, Nita, Labiosa, William, Hirschboeck , Katie,  Weber, Matt, van Riper III, Charles, Marlow, Joe, McCoy , Amy, Lara-Valencia, Francisco, Gray, Floyd, Huth  Hans, and Callegary, James, 2009, Impacts of Climate Change and Urban Growth on Ecosystem Services in the Upper Santa Cruz Watershed; Where We Live, Work, and Play [abs.]: Advanced Forum for Sustainability Development.
• Norman , Laura, Tallent-Halsell, Nita, Labiosa, William, Hirschboeck, Katie, Weber, Matt, McCoy, Amy, Callegary, James, Gray, Floyd, Huth Hans, van Riper III, Charles, Lara-Valencia, Francisco, and Marlow, Joe, 2009, Ecosystem Services Analysis of Climate Change and Urban Growth; The Santa Cruz Watershed Ecosystem Portfolio Model (SCWEPM) [abs.]: 2009 Phenology Research and Observations of Southwest Ecosystems (PROSE) Symposium, October 2nd, 2009, Tucson, AZ.

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Mineral and Environmental Resources also has offices in Menlo Park / Reno / Spokane