Albert H Hofstra

Global Geochemical Database for Critical Minerals in Archived Mine Samples

The Critical Minerals in Archived Mine Samples Database (CMDB) contains chemistry and geologic information for historic ore and ore-related rock samples from mineral deposits in the United States. In addition, the database contains samples from archetypal deposits from 27 other countries in North America, South America, Asia, Africa and Europe. Samples were obtained from archived ore collections under the U.S. Geological Survey's project titled "Quick Assessment of Rare and Critical Metals in Ore Deposits: A National Assessment" (2008 to 2013) in an effort to begin an assessment of the Nations' previously mined ore deposits for critical minerals. Mineralized and altered rock samples were provided by the Colorado...

Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Alaska, Argentina, Arizona, Arkansas, Australia, All tags... Brazil, Burma, California, Canada, Chile, China, Colorado, Cuba, Democratic Republic of Congo, Economic Geology, Finland, Geochemistry, Germany, Honduras, Idaho, India, Indonesia, Japan, Kansas, Kentucky, Maine, Mauritania, Mexico, Michigan, Mineral Resources, Minnesota, Missouri, Montana, NGDB, Namibia, National Geochemical Database, Nevada, New Jersey, New Mexico, New York, North Carolina, Norway, Oklahoma, Oregon, Papua New Guinea, Pennsylvania, Peru, Philippines, Poland, Portugal, Russia, South Africa, South Carolina, South Dakota, Sweden, Tennessee, Texas, USGS Science Data Catalog (SDC), United States, Utah, Vietnam, Virginia, Washington, Wisconsin, Wyoming, Zambia, aluminum, antimony, arsenic, atomic emission spectroscopy, barium, beryllium, bismuth, boron, cadmium, calcium, cerium, chemical analysis, chromium, cobalt, copper, critical minerals, dysprosium, economic geology, erbium, europium, fluorine, gadolinium, gallium, geochemical data, geochemistry, geoscientific information, germanium, gold, hafnium, historic ores, holmium, indium, iron, lanthanum, lead, lithium, lutetium, magnesium, manganese, metallic mineral resources, mineral deposit type, mineral deposits, mineralogy, molybdenum, neodymium, nickel, niobium, nonmetallic mineral resources, palladium, phosphorus, platinum, potassium, praseodymium, rhenium, rock geochemistry, rocks and deposits, samarium, scandium, silicon, silver, strontium, sulfur, tantalum, tellurium, terbium, thallium, thorium, thulium, tin, titanium, tungsten, uranium, vanadium, ytterbium, yttrium, zinc, zirconium, Fewer tags

Trace element chemistry of sulfides and quartz, in situ sulfur isotope values of sulfides, cathodoluminescence of quartz, fluid inclusion microthermometry and raman, and radiogenic isotope and whole rock geochemistry from the Stibnite-Yellow Pine district, Idaho 2016-2022

This dataset is a collection of geochemical data on samples from the Stibnite-Yellow Pine district of Idaho. The datasets include: whole rock geochemistry; lead, strontium and neodymium isotope chemistry of sulfides and whole rock samples by isotope dilution-thermal-mass spectrometry (ID-TIMS); in situ sulfur isotope chemistry of sulfides by laser ablation-multi collector-inductively coupled-mass spectrometry (LA-MC-ICP-MS); electron microprobe (EMP) images, cathodoluminescence (CL) images and spectra, along with EMP and laser ablation-inductively coupled-mass spectrometry (LA-ICP-MS) trace element analysis of sulfides and quartz; and fluid inclusion microthermometry and raman. Samples were collected from the surface...

Categories: Data; Tags: Cinnabar, GGGSC, Geochemistry, Geology, Geophysics, and Geochemistry Science Center, Hangar Flats, All tags... Idaho, MRP, Mineral Resources Program, Mineralogy, Stibnite, U.S. Geological Survey, USGS, USGS Science Data Catalog (SDC), West End, Yellow Pine Mine, arsenopyrite, economic geology, economy, geochemistry, geoscientificInformation, gold, mass spectroscopy, metallic mineral resources, mineralogy, particle-beam spectroscopy, pyrite, scanning electron microscopy, stibnite, Fewer tags

Fluid Inclusion Noble Gas Data from Goldfield and Tonopah Epithermal Au-Ag Deposits

Twenty-five ore and gangue mineral separates from the Miocene-age Goldfield and Tonopah epithermal Au-Ag deposits in southwestern Nevada were analyzed to determine the helium, neon, and argon (He, Ne, and Ar) isotopic compositions contained in fluid inclusions. Four mineral separates from the Butte Main Stage vein deposit and two from the Bingham pyrite-enargite vein deposits were also analyzed. Fifteen separates are from hand samples collected from underground mine workings and the remaining 16 are from mine tailings piles and pits excavated within the past 100 years. The separates consist dominantly of pyrite, enargite, and quartz, with lesser amounts of sphalerite, galena, potassium feldspar, bismuthinite, marcasite,...

Categories: Data; Tags: 3He/4He, Ar, Bingham Copper Mine, Bingham pyrite-enargite vein deposit, Butte Main Stage vein deposit, All tags... CMERSC, Central Minerals and Environmental Resources Science Center, Goldfield Mining District, Goldfield epithermal Au-Ag deposit, He, MRP, Mineral Resources Program, Mineralogy, Montana, Ne, Nevada, Tonopah Mining District, Tonopah epithermal Au-Ag deposit, USGS Science Data Catalog (SDC), Utah, alunite, argite, argon, bismuthinite, chalcocite, chalcopyrite, economy, epithermal Au-Ag deposit, fluid inclusions, galena, gangue minerals, geoscientificInformation, gold, helium, isotopes, isotopic ratios, marcasite, mineral deposits, mineral separates, neon, noble gas elements, ore, ore formation, potassium feldspar, pyrite, quartz, rhodonite, sphalerite, vein deposit, volatiles, Fewer tags

Digital map of iron sulfate minerals, other mineral groups, and vegetation of the western United States derived from automated analysis of Landsat 8 satellite data

Multispectral remote sensing data acquired by Landsat 8 Operational Land Imager (OLI) sensor were analyzed using an automated technique to generate surficial mineralogy and vegetation maps of the conterminous western United States. Six spectral indices (e.g. band-ratios), highlighting distinct spectral absorptions, were developed to aid in the identification of mineral groups in exposed rocks, soils, mine waste rock, and mill tailings across the landscape. The data are centered on the western U.S. and cover portions of Texas, Oklahoma, Kansas, the Canada-U.S. border, and the Mexico-U.S. border during the summers of 2013 – 2014. Methods used to process the images and algorithms used to infer mineralogical composition...

Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: Arizona, California, Canada, Colorado, Idaho, All tags... Kansas, Land Use Change, Mexico, Minnesota, Montana, Nebraska, Nevada, New Mexico, North Dakota, Oklahoma, Oregon, Remote Sensing, South Dakota, Texas, USGS Science Data Catalog (SDC), United States, Washington, Wyoming, agricultural fields, argillic, clay, computational methods, computational methods, computational methods, ferric iron, ferrous iron, geoscientificInformation, green vegetation, hydrothermal alteration, image analysis, image analysis, image analysis, iron hydroxide minerals, iron sulfate minerals, land use and land cover, land use and land cover, land use and land cover, marble, mica, mine waste, multispectral imaging, multispectral imaging, multispectral imaging, oxides, pyrite, remote sensing, remote sensing, remote sensing, Fewer tags

Digital map of iron sulfate minerals, other mineral groups, and vegetation of the San Juan Mountains, Colorado, and Four Corners Region derived from automated analysis of Landsat 8 satellite data

Multispectral remote sensing data acquired by the Landsat 8 Operational Land Imager (OLI) sensor were analyzed using a new, automated technique to generate a map of exposed mineral and vegetation groups in the western San Juan Mountains, Colorado and the Four Corners Region of the United States (Rockwell and others, 2021). Spectral index (e.g. band-ratio) results were combined into displayed mineral and vegetation groups using Boolean algebra. New analysis logic has been implemented to exploit the coastal aerosol band in Landsat 8 OLI data and identify concentrations of iron sulfate minerals. These results may indicate the presence of near-surface pyrite, which can be a potential non-point source of acid rock drainage....

Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: Arizona, Colorado, Four Corners region, Lake City caldera, New Mexico, All tags... San Juan Mountains, Silverton caldera, USGS Science Data Catalog (SDC), United States, Utah, agricultural fields, argillic, clay, computational methods, ferric iron, ferrous iron, geoscientificInformation, green vegetation, hydrothermal alteration, image analysis, iron hydroxide minerals, iron sulfate minerals, land use and land cover, marble, mica, mine waste, multispectral imaging, oxides, pyrite, remote sensing, Fewer tags