Johnson, Michaela R.

About the author

ORCID: 0000-0001-6133-0247
Aeromagnetic surveying, Aeroradiometric surveying, Alteration, Aluminum, Antimony, Arsenic, Atomic absorption analysis, Atomic emission spectroscopy, Barium, Beryllium, Bismuth, Boron, Cadmium, Calcium, Catalogs and indexes, Cerium, Cesium, Chlorine, Chromatography, Chromium, Cobalt, Copper, Deformation (geologic), Dissolved gases, Dysprosium, Economic geology, Electromagnetic surveying, Erbium, Europium, Faulting (geologic), Fluorine, Fracture (geologic), Gadolinium, Gallium, Geochemistry, Geologic structure, Geophysics, Geospatial datasets, Germanium, Gold, Gravimeter measurement, Groundwater, Hafnium, Handheld field spectroscopy, Holmium, Hydrogeology, Hyperspectral imaging, Indium, Infrared imaging, Iridium, Iron, Lanthanum, Lead, Lithium, Lutetium, Magnesium, Magnetic field (earth), Magnetometer measurement, Magnetotelluric surveying, Manganese, Mass spectroscopy, Mathematical modeling, Mercury, Metallic mineral resources, Mineral deposits, Mineral resources, Mineralogy, Molybdenum, Multispectral imaging, Natural resource assessment, Natural resource exploration, Navigational data, Neodymium, Neutron activation analysis, Nickel, Niobium, Nitrogen, Palladium, Particle-beam spectroscopy, Phosphorus, Platinum, Potassium, Praseodymium, Remanent magnetism, Remote sensing, Resistivity, Rhenium, Rocks and deposits, Rubidium, Salinity, Saltwater intrusion, Samarium, Scandium, Selenium, Silicon, Silver, Sodium, Soil chemistry, Strontium, Structural geology, Structure contours, Sulfur, Tantalum, Tectonic processes, Tellurium, Terbium, Thallium, Thorium, Thulium, Tin, Titanium, Tungsten, Unconsolidated deposits, Uranium, Vanadium, Visible light imaging, Volcanic rocks, Water chemistry, Water pH, Water quality, Water sampling, Water temperature, X-ray diffraction, Ytterbium, Yttrium, Zinc, Zirconium, Aquifers, Fault zones, Mineral deposit areas, Springs (hydrographic), ARC/INFO grid export format, ENVI image format, ER Mapper grid format, GeoTIFF, KML, MT/EMAP Data Interchange Standard, Microsoft Access format, Microsoft Excel format, Columnar text, Comma-delimited text, File geodatabase (Esri), Shapefile

Airborne Electromagnetic (AEM) Survey Inventory

Spatial footprints with scientific and operational characteristics of airborne electromagnetic surveys conducted by or for the USGS.

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Airborne Geophysical Survey Inventory of the Conterminous United States, Alaska, Hawaii, and Puerto Rico (ver. 3.0, November 2021)

Compilation of airborne geophysical surveys (magnetic, radiometric, and electromagnetic) with links, for each survey to the data, metadata, and preview images. Includes a measure of quality indicating which surveys are likely most useful for investigations of subsurface mineral deposits. Data are provided in Esri file geodatabase, shapefile, and CSV formats.

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Geochemical analyses of surface water, groundwater and springs surrounding Mount Emmons near Crested Butte, Colorado (ver. 2.0, September 2020)

Inorganic chemical analysis of surface- and groundwater and springs in this area to understand natural versus anthropogenic inputs from mineralized and hydrothermally altered areas. Data are provided in Esri file geodatabase, CSV, and shapefile formats.

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Identification of mineral resources in Afghanistan-Detecting and mapping resource anomalies in prioritized areas using geophysical and remote sensing (ASTER and HyMap) data

Using geophysical and remote-sensing data, previously unrecognized targets of potential mineralization were identified; this report shows those targets along with the evidence for their potential.

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Three GIS datasets defining areas permissive for the occurrence of uranium-bearing, solution-collapse breccia pipes in northern Arizona and southeast Utah

Data to determine the distribution of uranium deposits, breccia pipes, and collapse features and define areas permissible for uranium-bearing breccia pipes in northern Arizona and southeast Utah. Data are provided in shapefile format.

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Corescan Hyperspectral Core Imager, Mark III system data collected for the characterization of mineral resources near Nabesna, Alaska, 2014-2016

Hyperspectral analysis of rock samples using this equipment provide information on the composition and morphology of the minerals in the rock in microscopic detail. Data are provided as imagery in various formats.

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Imaging spectrometer reflectance data, mineral predominance map, and white mica wavelength position map, Nabesna Quadrangle, Alaska

Reflectance, mineral predominance, and white mica wavelength position data calculated from an airborne hyperspectral imaging survey of this area using a HyMap sensor in 2014. Data are provided in a format generated by the ENVI software product, CSV, and GeoTiff.

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Airborne magnetic and radiometric survey, southeast Missouri and western Illinois, 2018-2019

Digital flight line data for a high-resolution horizontal magnetic gradient and radiometric survey over an area of southeast Missouri and western Illinois. Data are provided in CSV and GeoTiff formats.

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Reanalysis of Selected Archived NURE-HSSR Sediment and Soil Samples from Alaska

New analysis of existing samples from this area, to improve precision and accuracy and consistency of the measurements with those made on newly-collected samples. Data are provided in Microsoft Access, Microsoft Excel, CSV, and shapefile formats.

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Characterization of potential mineralization in Afghanistan: four permissive areas identified using imaging spectroscopy data

As part of the U.S. Geological Survey and Department of Defense Task Force for Business and Stability Operations natural resources revitalization activities in Afghanistan, four permissive areas for mineralization, Bamyan 1, Farah 1, Ghazni 1, and Ghazni

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Airborne electromagnetic and magnetic survey data in Big Cypress National Preserve and Everglades National Park, 2001

Airborne electromagnetic (AEM) and magnetic survey data, a total of 3065 line-kilometers, collected during October 2001 with line spacing 400m and nominal altitude of 30m. Includes raw and processed AEM data and magnetic data, in CSV format.

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Airborne electromagnetic and magnetic survey data, Stillwater Complex, Montana, May 2000 (ver. 2.0, June 2020)

Data from a helicopter-borne electromagnetic and magnetic survey flown over this area area in 2000. Nominal elevation of the sensor was 60 meters. Survey coverage comprises 1,914 line kilometers. Data are provided in CSV format.

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Magnetotelluric Data from the San Andreas Fault, Loma Prieta CA, 1989-1990

Magnetotelluric data collected in 1989 and 1990 using USGS portable truck mounted systems that measure the distribution of electrical conductivity beneath the surface of the earth. This release provides digital information previously collected, recovered and reformatted for use with modern software. Data are provided in MT/EMAP formats.

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Airborne electromagnetic mapping of the base of aquifer in areas of western Nebraska

Gridded data used to revise base of aquifer, with supporting elevation data.

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Airborne imaging spectrometer data collected for characterizing mineral resources near Nabesna, Alaska, 2014

Flight-line data for a hyperspectral survey using the HyMap sensor over this area in 2014 where porphyry deposits are exposed. The data are provided in imagery formats.

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Hyperspectral surveying for mineral resources in Alaska

Alaska is a major producer of base and precious metals and has a high potential for additional undiscovered mineral resources. However, discovery is hindered by Alaska’s vast size, remoteness, and rugged terrain. New methods are needed to overcome t

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Multiscale hyperspectral imaging of the Orange Hill Porphyry Copper Deposit, Alaska, USA, with laboratory-, field-, and aircraft-based imaging spectrometers

High resolution mineralogical mapping from hyperspectral core imaging data allows us to illustrate the spatial distribution of key mineralogical vectors in and around a deposit. This knowledge aids in rapid assessment of exploration models and the development of precise resource domains.

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Whole rock, soil, sediment, x-ray diffraction, and electron microprobe analyses of samples from the Orange Hill-Bond Creek area, Nabesna Quadrangle, Alaska

Geochemical, x-ray diffraction mineralogical, and electron probe microanalysis (EPMA) data on rocks, soils, and sediments collected near porphyry copper deposits in this area. Data are provided in CSV format.

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Airborne electromagnetic and magnetic survey data and inverted resistivity models, Cedar Rapids, Iowa, May 2017

Airborne electromagnetic and magnetic survey data were collected in 2017 along 347 line kilometers. Includes processed AEM and magnetic data and inverted resistivity depth sections. Data are provided in CSV format.

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Hyperspectral Surface Materials Map of Quadrangle 3268, Khayr Kot (521) and Urgun (522) Quadrangles, Afghanistan, Showing Iron-bearing Minerals and Other Materials

<p>This map shows the spatial distribution of selected iron-bearing minerals and other materials derived from analysis of airborne HyMap™ imaging spectrometer (hyperspectral) data of Afghanistan collected in late 2007. This map is one in a series of U.S

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Hyperspectral Surface Materials Map of Quadrangle 3566, Sangcharak (501) and Sayghan-o-Kamard (502) Quadrangles, Afghanistan, Showing Carbonates, Phyllosilicates, Sulfates, Altered Minerals, and Other Materials

<p>This map shows the spatial distribution of selected carbonates, phyllosilicates, sulfates, altered minerals, and other materials derived from analysis of airborne HyMap™ imaging spectrometer (hyperspectral) data of Afghanistan collected in late 2007.

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Data for a Comprehensive Survey of Fault Zones, Breccias, and Fractures in and Flanking the Eastern Espanola Basin, Rio Grande Rift, New Mexico

Data and analyses from 53 individual fault zones and 22 other brittle structures, such as breccia zones, joints, and veins, investigated at a total of just over 100 sites. Includes geologic maps; field observations and measurements; orientation, kinematic paleostress analyses and modeling; statistical examination of 575 fault trace lengths; mineralogy and chemistry of host and fault rocks. Data are provided in shapefile and CSV formats.

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