Mineral Resources Program

Home

Programs L2 Landing Page

The USGS Mineral Resources Program delivers unbiased science and information to understand mineral resource potential, production, consumption, and how minerals interact with the environment.

Visit Our Program website

Mineral Statistics and Commodity Information

Mineral Statistics and Commodity Information

Statistics and information on minerals and materials essential to the U.S. economy, the national security, and protection of the environment published by the National Minerals Information Center.

Minerals Information

Mineral Resources Online Spatial Data

Mineral Resources Online Spatial Data

Interactive maps and downloadable data for regional and global geology, geochemistry, geophysics, and mineral resources.

Find Data

Science Priorities

We study geologic processes that concentrate known mineral resources at specific localities in the Earth's crust, and assess quantities, qualities, and areas of undiscovered mineral resources, or potential future supply.

Minerals Information and Material Flow

Characterization and Identification of Critical Mineral Resources

Mineral Resource Assessments

Mineral System Life Cycles

Regional Studies and Mineral Resources

Labs and Data

Discover Our Science

News

Date published: February 5, 2019

POSTPONED due to weather: Ask Questions and Learn More About the Low-Level Helicopter Flying Above the Mississippi Alluvial Plain

Media:            Please join the U.S. Geological Survey, CGG Airborne and various partners for a demonstration of the low-flying helicopter and description of what scientists are seeking in and around the Mississippi Alluvial Plain.

Date published: December 13, 2018

Seeking Water from Above: Low-Level Helicopter to Fly Southern Portion of Mississippi Alluvial Plain

Editor:  In the public interest and in accordance with Federal Aviation Administration regulations, the USGS is announcing this low-level airborne project.  Your assistance informing the local communities is appreciated.  

Date published: November 19, 2018

Low-flying Airplane to Map Geology of Southeast Missouri

Editor:  In the public interest and in accordance with Federal Aviation Administration regulations, the USGS is announcing this low-level airborne project.  Your assistance in informing the local communities is appreciated. 

The USGS Mineral Resources Program supports data collection and research on nonfuel mineral resources. We study geologic processes that form known mineral resources at specific areas in the Earth's crust and assess potential future supply of mineral resources.

Our Science Activities
Filter Total Items: 62
Date published: December 17, 2018
Status: Active

Mineral Commodity Statistics and Information

The National Minerals Information Center publishes statistics and information on the worldwide supply of, demand for, and flow of minerals and materials essential to the U.S. economy, the national security, and protection of the environment.

The annual Mineral Commodity Summaries Report contains contains...

Date published: December 17, 2018
Status: Active

Minerals Statistics and Information - Domestic and International

The USGS National Minerals Information Center canvasses domestic and international mineral industries on production and production values.

State Minerals Statistics and Information are compiled and presented in the Mineral Commodity...

Date published: December 17, 2018
Status: Active

Materials Flow and Recycling - Minerals

The National Minerals Information Center produces reports on materials flow, recycling, supply chain, and sustainability. These publications describe the flow of materials from source to ultimate disposition to help better understand the economy, manage the use of natural resources, and protect the environment.

Materials...

Date published: August 22, 2018
Status: Active

Isotope and Chemical Methods for Mineral and Geoenvironmental Assessments and Support of USGS Science Strategy

This Project integrates several geochemical tools—stable isotope geochemistry, noble gas geochemistry, active gas geochemistry, single fluid inclusion chemistry, and fluid inclusion solute chemistry—in studies of the processes that form mineral deposits and the processes that destroy them during mining or natural weathering. Research is directed toward fundamental scientific questions or, in...

Date published: August 9, 2018
Status: Active

Antimony In and Around the Yellow Pine Deposit, Central Idaho

Project objectives are to document the origin of the Yellow Pine gold-antimony deposit and, by extension, the origin of this deposit type. Our goal is to understand the structural, tectonic, and magmatic setting of the deposit, the character of the ore-transporting fluids, the conditions of ore deposition, and the regional stratigraphic framework and geochemical ore controls of metasedimentary...

Date published: August 3, 2018
Status: Active

Synthesis of the Tectonic, Magmatic, and Metallogenic Evolution of the Midcontinent Rift System

The overall project objective is to develop a comprehensive synthesis of the tectonic, magmatic, and metallogenic evolution of the Midcontinent Rift System (MRS) through time by integrating geophysical, magmatic, and geochemical data and to create 3-D models of the rift over its evolution.

Contacts: Laurel Woodruff
Date published: August 1, 2018
Status: Active

Processes Controlling Groundwater Quality in Uranium In-Situ Recovery (ISR) Mining

The project's primary objective is to evaluate the reducing capacity of an aquifer down gradient of a roll-front ore zone to assess the mobility of uranium and other associated elements (e.g. arsenic, selenium, molybdenum, and sulfur). Assessing the reducing capacity of the aquifer will require characterization of the mineralogy, geochemistry, and microbiology and their variation across the...

Contacts: Jean M Morrison
Date published: August 1, 2018
Status: Active

Mineville, Eastern Adirondacks – Geophysical and Geologic Studies

The USGS is using a set of advanced imaging and analysis tools to study the rocks within the eastern Adirondacks of upstate New York. The goal of these studies is to gain a better understanding of the geology and mineral resources in the area.

Contacts: Anjana K Shah
Date published: August 1, 2018
Status: Active

Mineral Resource Online Data Catalog

Our project makes the digital spatial data produced by the Mineral Resources Program available via a web portal so that users of our data can easily access spatial data for solving scientific and technical problems: https://mrdata.usgs.gov/.

Date published: August 1, 2018
Status: Active

Magmas to Metals: Melt Inclusion Insights into the Formation of Critical Element-Bearing Ore Deposits

This project applies innovative melt inclusion and mineralogical techniques to characterize several distinctive magma types occurring together with prodigious, critical rare earth elements (REE) and gold-(antimony-tellurium) ore deposits within the U.S. We will characterize the pre-eruptive/pre-emplacement magmatic conditions in several districts. Our goal is to determine the role of magmatism...

Date published: July 31, 2018
Status: Active

Metal Transport in Mineralized Mountain Watersheds

The central objective of this project is to develop a greater understanding of deep bedrock groundwater circulation and its contribution to surface water metal loads in mineralized mountain blocks composed of sedimentary rocks. This work is being performed in cooperation with Lawrence Berkeley National Laboratory as part of a broader research program aimed at understanding processes...

Date published: July 31, 2018
Status: Active

Integrated Hyperspectral, Geophysical and Geochemical Studies of Yellowstone National Park Hydrothermal Systems

We are researching the subsurface groundwater flow systems in Yellowstone and the relation of these systems to understanding the regional movement of water in a volcanic center. New geophysical data will be integrated with existing data sets from hyperspectral data from Yellowstone's thermal areas and thermal water geochemistry to help define regionally extensive mineral assemblages, the...

Contacts: JoAnn Holloway

Our Mineral Resources On-Line Spatial Data web portal is our primary resource for interactive maps and downloadable data for regional and global geology, geochemistry, geophysics, and mineral resources.

Find Data
Filter Total Items: 409
Date published: December 11, 2018

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

Corescan© Hyperspectral Core Imager Mark III (HCI-III) system data were acquired for hand samples, and subsequent billets made from the hand samples, collected during the U.S. Geological Survey (USGS) 2014, 2015, and 2016 field seasons in the Nabesna area of the eastern Alaska Range. This area contains exposed porphyry deposits and hand samples were collected throughout the region in...

Date published: November 30, 2018

Digital Data for the Geologic Map of the Central Beaverhead Mountains, Lemhi County, Idaho, and Beaverhead County, Montana

This Data Release contains geospatially-enabled geological data to accompany the Geologic Map of the Central Beaverhead Mountains, Lemhi County, Idaho, and Beaverhead County, Montana. This map portrays detailed geology of the central Beaverhead Mountains, printable at 1:50,000 scale. These data were collected between 1997 and 2017, and synthesized to provide significant new stratigraphic and...

Date published: October 17, 2018

U-Pb SHRIMP and 40Ar/39Ar geochronologic data and backscatter electron (BSE) and panchromatic cathodoluminescent (CL) imagery of sample materials for study of dikes, country rock, and alteration systems, Butte, U.S.A.

These data are for a multidisciplinary study of dikes, country rock, and alteration systems, Butte, U.S.A. Results of the study are described and interpreted in Lund and others (2018). Data included are U-Pb sensitive high-resolution ion microprobe (SHRIMP) geochronology for quartz porphyry dikes, 40Ar/39Ar thermochronologic data for biotite, hornblende, and K-feldspar from Butte granite...

Date published: October 11, 2018

Reanalysis of Selected Archived NURE-HSSR Sediment and Soil Samples from Arizona, California, Idaho, Montana, Nevada, New Mexico, and Utah

Beginning in November of 2015, a project was undertaken to reanalyze approximately 60,000 archived sample splits collected as part of the National Uranium Resource Evaluation (NURE) Hydrogeochemical and Stream Sediment Reconnaissance (HSSR) project from selected areas in Arizona, California, Idaho, Montana, Nevada, New Mexico, and Utah. A small amount (approximately 0.25 g) of sieved -75...

Date published: September 26, 2018

Audiomagnetotelluric sounding data, stations 1-9, Taos Plateau Volcanic Field, New Mexico, 2009

This dataset includes the audio-magnetotelluric (AMT) sounding data collected in 2009 in and near the San Luis Basin, New Mexico. The U.S. Geological Survey conducted a series of multidisciplinary studies, including AMT surveys, in the San Luis Basin to improve understanding of the hydrogeology of the Santa Fe Group and the nature of the sedimentary deposits comprising the principal...

Date published: September 12, 2018

Lung Bioassay of Ground Dwelling Mammals from the Grand Canyon Uranium Breccia Pipe Region Using Scanning Electron Microscopy

Small mammal lung tissue sections were examined to help assess the effects of weathering on bioavailability and toxicity from sites in different phases of the mine cycle within the Grand Canyon area. Hematoxylin and eosin slides of lung tissue from brush mouse, deer mice, and pocket gophers were examined by a veterinary pathologist who marked areas of the tissue that showed normal,...

Date published: August 27, 2018

Tungsten Deposits in the United States

Tungsten deposits have been mined in the United States since the late 19th century, but there has been minimal production of tungsten from mines in the United States since price crashes in the 1980’s. Tungsten is necessary for strategic, consumer, and commercial applications. Due to its strength, hardness, high melting and boiling points, tungsten is used in wear-resistant...

Date published: August 15, 2018

Water, Soil, Rock, and Sediment Geochemistry Data from the Vicinity of Yellow Pine, Idaho, 2015-2017

Water and sediment samples were collected by the U.S. Geological Survey in cooperation with the U.S. Environmental Protection Agency at or near baseflow conditions from 2015-2017 in the East Fork South Fork Salmon River watershed near Yellow Pine, Valley County, Idaho. Soil, rock and tailings samples were collected in June 2015. Sampling focused on Cinnabar Creek, which flows through the...

Date published: July 30, 2018

Cobalt Deposits in the United States

This data release provides descriptions of more than 60 mineral regions, mines, and mineral deposits within the United States and its territories that are reported to contain enrichments of cobalt (Co). To focus the scope of this data release, we report only mined deposits and exploration prospects with past production, or resource and reserve estimates of 1,000 metric tons or more of cobalt...

Date published: July 6, 2018

Geochemistry of ore, host rock, and mine waste pile samples of iron oxide-apatite (IOA) deposits of the eastern Adirondack Highlands, New York, in relation to potential rare earth elements resources

The ore from historic iron mines of the eastern Adirondack Highlands, New York, contain abundant quantities of rare earth element (REE)-bearing apatite crystals. These apatite crystals are especially enriched in Y, La, Ce, and Nd. In-ground ore, mine waste piles, and tailings piles that are associated with these mines could contain apatite and other REE-bearing phases at elevated...

Date published: July 2, 2018

Magnetotelluric sounding data, stations 1 to 12, East-Central Tooele County, Utah, 2003

This dataset includes the magnetotelluric (MT) sounding data collected in 2003 along a north-south profile west of Tooele, Utah. It is important to know whether major mining districts in the Northern Nevada Gold Province are underlain by rocks of the Archean Wyoming craton, which are known to contain orogenic gold deposits, or by accreted rocks of the Paleoproterozoic Mojave province. It is...

Date published: June 4, 2018

Tin Deposits in the United States

This data release provides descriptions of more than 120 mineral regions, mines, and mineral deposits within the United States that are reported to contain enrichments of tin (Sn). This data release only includes sites with publicly available records of past production of tin, or a defined resource of tin, or both. The inclusion of a particular mineral deposit in this database is not meant to...

Filter Total Items: 8
Date published: January 25, 2018

Mineral Deposits of the Midcontinent Rift System

USGS interactive Story Map describing the Mineral Deposits of the Midcontinent Rift System.

Date published: April 1, 2016

Geochemical and Mineralogical Maps for Soil for the Conterminous U.S.

Online data set provides an estimate of the abundance and spatial distribution of chemical elements and minerals in soils of the conterminous United States and represents a baseline for soil geochemistry and mineralogy against which future changes may be recognized and quantified.

Date published: March 7, 2016

Geologic Map Data

Digital geologic maps of the U.S. States with consistent lithology, age, GIS database structure, and format.

Date published: March 7, 2016

Mining Operation and Prospecting

Mine plants and operations for commodities monitored by the National Minerals Information Center of the USGS. Operations included are those considered active in 2003 and surveyed by the USGS.

Date published: March 7, 2016

Minerals Information Maps

Maps of facilities for both international and domestic locations.

Date published: December 1, 2013

Hyperspectral Surface Materials Maps of Afghanistan 1:250,000-scale Quadrangle Series

1:250,000-scale quadrangle maps covering Afghanistan showing the distribution of iron-bearing minerals, selected carbonates, phyllosilicates, sulfates, altered minerals, and other materials derived from analysis of HyMap imaging spectrometer data.

Date published: July 17, 2012

Surface Materials Map of Afghanistan: Iron-bearing Minerals and Other Materials

This map shows the distribution of selected iron-bearing minerals and other materials derived from analysis of HyMap imaging spectrometer data of Afghanistan. 

Date published: July 17, 2012

Surface Materials Map of Afghanistan: Carbonates, Phyllosilicates, Sulfates, Altered Minerals, and Other Materials

This map shows the distribution of selected carbonates, phyllosilicates, sulfates, altered minerals, and other materials derived from analysis of HyMap imaging spectrometer data of Afghanistan.  

Filter Total Items: 2,190
Year Published: 2018

Geologic map of the central Beaverhead Mountains, Lemhi County, Idaho, and Beaverhead County, Montana

This geologic map of the central Beaverhead Mountains portrays a complex geologic history of depositional basin development interspersed with deformational events. Generalized geology for young basins, compiled from sources on both sides of the range, is combined with newly mapped bedrock geology to better integrate geologic development of the map...

Lund, Karen
Lund, K., 2018, Geologic map of the central Beaverhead Mountains, Lemhi County, Idaho, and Beaverhead County, Montana: U.S. Geological Survey Scientific Investigations Map 3413, pamphlet 27 p., scale 1:50,000, https://doi.org/10.3133/sim3413.

Year Published: 2018

Geologic map of the Fort Collins 30'×60' quadrangle, Larimer and Jackson Counties, Colorado, and Albany and Laramie Counties, Wyoming

The rocks and landforms of the Fort Collins 30′ × 60′ 1:100,000-scale U.S. Geological Survey quadrangle reveals a particularly complete record of geologic history in the northern Front Range of Colorado. The Proterozoic basement rocks exposed in the core of the range preserve evidence of Paleoproterozoic marine sedimentation, volcanism, and...

Workman, Jeremiah B.; Cole, James C.; Shroba, Ralph R.; Kellogg, Karl S.; Premo, Wayne R.
Workman, J.B., Cole, J.C., Shroba, R.R., Kellogg, K.S., and Premo, W.R., 2018, Geologic map of the Fort Collins 30'×60' quadrangle, Larimer and Jackson Counties, Colorado, and Albany and Laramie Counties, Wyoming: U.S. Geological Survey Scientific Investigations Map 3399, pamphlet 83 p., scale 1:100,000, https://doi.org/10.3133/sim3399/.

Year Published: 2018

Descriptive models for epithermal gold-silver deposits: Chapter Q in

Epithermal gold-silver deposits are vein, stockwork, disseminated, and replacement deposits that are mined primarily for their gold and silver contents; some deposits also contain substantial resources of lead, zinc, copper, and (or) mercury. These deposits form in the uppermost parts of the crust, at depths less than about 1,500 meters below the...

John, David A.; Vikre, Peter G.; du Bray, Edward A.; Blakely, Richard J.; Fey, David L.; Rockwell, Barnaby W.; Mauk, Jeffrey L.; Anderson, Eric D.; Graybeal, Frederick T.
John, D.A., Vikre, P.G., du Bray, E.A., Blakely, R.J., Fey, D.L., Rockwell, B.W., Mauk, J.L., Anderson, E.D., and Graybeal, F.T., 2018, Descriptive models for epithermal gold-silver deposits: U.S. Geological Survey Scientific Investigations Report 2010–5070–Q, 247 p., https://doi.org/10.3133/sir20105070Q.

Year Published: 2018

Understanding the captivity effect on invertebrate communities transplanted into an experimental stream laboratory

Little is known about how design and testing methodologies affect the macroinvertebrate communities that are held captive in mesocosms. To address this knowledge gap, we conducted a 32‐d test to determine how seeded invertebrate communities changed once removed from the natural stream and introduced to the laboratory. We evaluated larvae survival...

Schmidt, Travis S.; Rogers, Holly; Miller, Janet L.; Mebane, Christopher A.; Balistrieri, Laurie S.
Schmidt, T. S., Rogers, H. A., Miller, J. L., Mebane, C. A. and Balistrieri, L. S. (2018), Understanding the captivity effect on invertebrate communities transplanted into an experimental stream laboratory. Environ Toxicol Chem, 37: 2820-2834. doi:10.1002/etc.4237

Year Published: 2018

Distinguishing brackish lacustrine from brackish marine deposits in the stratigraphic record: A case study from the late Miocene and early Pliocene Bouse Formation, Arizona and California, USA

Brackish marine and brackish continental environments are fundamentally different from a compositional perspective. Brackish water is often defined as having salinity lower than that of standard seawater but higher than that of freshwater, but less regard is given to the origin of the salts involved. The simple dilution of...

Bright, Jordon; Cohen, Andrew S.; Starratt, Scott W.
Bright, J., Cohen, A.S., and Starratt, S.W., 2018, Distinguishing brackish lacustrine from brackish marine deposits in the stratigraphic record: A case study from the late Miocene and early Pliocene Bouse Formation, Arizona and California, USA: Earth-Science Reviews, v. 185, p. 974-1003, https://doi.org/10.1016/j.earscirev.2018.08.011.

Year Published: 2018

Paleoseismic results from the Alpine site, Wasatch fault zone: Timing and displacement data for six holocene earthquakes at the Salt Lake City–Provo segment boundary

To improve the characterization of Holocene earthquakes on the Wasatch fault zone (WFZ), we conducted light detection and ranging (lidar)‐based neotectonic mapping and excavated a paleoseismic trench across an 8‐m‐high fault scarp near Alpine, Utah, located &lt;1&#x2009;&#x2009;km"><1  km<1  km south of the boundary...

Bennett, Scott E. K.; Duross, Christopher; Gold, Ryan D.; Briggs, Richard W.; Personius, Stephen; Reitman, Nadine G.; Devore, Joshua; Hiscock, Adam; Mahan, Shannon A.; Gray, Harrison J.; Gunnarson, Sydney; Stephenson, William J.; Pettinger, Elizabeth; Odum, Jackson K.

Year Published: 2018

Aeromagnetic map of Mountain Pass and vicinity, California and Nevada

Magnetic investigations of Mountain Pass and vicinity were begun as part of an effort to study regional crustal structures as an aid to understanding the geologic framework and mineral resources of the eastern Mojave Desert. The study area, which straddles the state boundary between southeastern California and southern Nevada, encompasses Mountain...

Ponce, David A.; Ponce, David A.; Denton, Kevin M.
Ponce, D.A., and Denton, K.M. (D.A. Ponce, ed.), 2018, Aeromagnetic map of Mountain Pass and vicinity, California and Nevada: U.S. Geological Survey Scientific Investigations Map 3412–B, scale 1:62,500, https://doi.org/10.3133/sim3412B.

Year Published: 2018

Isostatic gravity map of Mountain Pass and vicinity, California and Nevada

Gravity investigations of Mountain Pass and vicinity were begun as part of an effort to study regional crustal structures as an aid to understanding the geologic framework and mineral resources of the eastern Mojave Desert. The study area, which straddles the state boundary between southeastern California and southern Nevada, encompasses Mountain...

Ponce, David A.; Ponce, David A.; Denton, Kevin M.
Ponce, D.A., and Denton, K.M. (D.A. Ponce, ed.), 2018, Isostatic gravity map of Mountain Pass and vicinity, California and Nevada: U.S. Geological Survey Scientific Investigations Map 3412–A, scale 1:62,500, https://doi.org/10.3133/sim3412A.

Year Published: 2018

Geophysical and geologic maps of Mountain Pass and vicinity, California and Nevada

U.S. Geological Survey Scientific Investigations Map 3412 is a series of products that consists of geophysical and geologic maps of Mountain Pass and vicinity, California. Maps A and B (red outline in above map image) are gravity and aeromagnetic maps, respectively. The map series was begun as part of an effort to study regional crustal structures...

Ponce, David A.

Year Published: 2018

Critical minerals: A review of elemental trends in comprehensive criticality studies

Mineral criticality is a subjective concept that has evolved throughout history. An abundance of literature on this topic has been published over the last decade, encompassing a variety of criteria and methodologies. To our knowledge, this work is the first large-scale effort to organize and analyze recent comprehensive criticality studies in...

Hayes, Sarah M.; McCullough, Erin A.

Year Published: 2018

Interpretation of low‐temperature thermochronometer ages from tilted normal fault blocks

Low‐temperature thermochronometry is widely used to measure the timing and rate of slip on normal faults. Rates are often derived from suites of footwall thermochronometer samples, but regression of age vs. structural depth fails to account for the trajectories of samples during fault slip. We demonstrate that in rotating fault blocks, regression...

Johnstone, Samuel A.; Colgan, Joseph P.

Year Published: 2018

Controls on submarine channel-modifying processes identified through morphometric scaling relationships

Submarine channels share morphological similarities with rivers, but observations from modern and ancient systems indicate they are formed under processes and controls unique to submarine settings. Morphologic characteristics of channels—e.g., width, depth, slope, and the relationships among them—can constrain interpretations of channel-forming...

Shumaker, Lauren E.; Jobe, Zane R.; Johnstone, Samuel A.; Pettinga, Luke A.; Cai, Dingxin; Moody, Jeremiah D.
Shumaker, L.E., Jobe, Z.R., Johnstone, S.A., Pettinga, L.A., Cai, D., and Moody, J.D., 2018, Controls on submarine channel-modifying processes identified through morphometric scaling relationships: Geosphere, v. 14, no. 5, p. 1–17, doi: 10.1130/GES01674.1.

Filter Total Items: 1
Date published: March 6, 2018

Processing Routines in IDL for Spectroscopic Measurements (PRISM)

PRISM provides a framework to conduct spectroscopic analysis of measurements made using laboratory, field, airborne, and space-based spectrometers. Using PRISM functions, the user can compare the spectra of materials of unknown composition with reference spectra of known materials.

Filter Total Items: 135
Summary of OH-related near-infrared spectral features of unexpanded and expanded vermiculite ores.
February 13, 2019

Summary of OH-related near-infrared spectral features.

Table 6.  Summary of OH-related near-infrared spectral features of unexpanded and expanded vermiculite ores.

Notes: Vibrational positions from spectra of handpicked, ground mica flakes from the unexpanded GDS469 ore sample from Libby, MT; and the expanded vermiculite ores as noted.  Vibrational assignments from this study.  oa = OH overtone;

...
Accuracy of expanded vermiculite ore spectral source determinations.
February 13, 2019

Accuracy of expanded vermiculite ore spectral source determinations.

Table 7.  Accuracy of expanded vermiculite ore spectral source determinations and impurity detections. 

Notes: Samples evaluated for impurities using the Modified Cincinnati Method (MCM) with separates examined by Scanning Electron Microscope – Energy-Dispersive X-Ray Spectroscopy (SEM-EDS) for the presence of amphibole, talc, and/or serpentine, and using the

...
ANOVA with post hoc multiple pairwise statistical comparison between compositions of unexpanded vermiculite ore samples examined
February 13, 2019

ANOVA with post hoc multiple pairwise statistical comparison

Table A1.  ANOVA with post hoc multiple pairwise statistical comparison between compositions of unexpanded vermiculite ore samples examined in this study.

 

Notes: Mg fraction = Mg/(Mg+Aloct +Feoct), tetrahedral Al fraction = (Altet + Si), total Al, and total Fe are based on Electron Probe MicroAnalysis (EPMA) of the

...
ANOVA with post hoc multiple pairwise statistical comparison between compositions of expanded vermiculite ore samples examined.
February 13, 2019

ANOVA with post hoc multiple pairwise statistical comparison.

Table A2.  ANOVA with post hoc multiple pairwise statistical comparison between compositions of expanded vermiculite ore samples examined in this study. 

Notes: Mg fraction = Mg/(Mg+Aloct +Feoct), tetrahedral Al fraction = (Altet + Si), total Al, and total Fe are based on Electron Probe MicroAnalysis (EPMA) of the expanded ore

...
ANOVA with post hoc multiple pairwise statistical comparison between compositions of selected unexpanded vermiculite ore.
February 13, 2019

ANOVA with post hoc multiple pairwise statistical comparison.

Table A3.  ANOVA with post hoc multiple pairwise statistical comparison between compositions of the selected unexpanded vermiculite ore samples and all other unexpanded vermiculite ore samples from the four major historical sources examined in this study.

Notes: Mg fraction = Mg/(Mg+Aloct +Feoct), tetrahedral Al fraction = (Altet +

...
ANOVA with post hoc multiple pairwise statistical comparison between compositions of selected unexpanded vermiculite ore samples
February 13, 2019

ANOVA with post hoc multiple pairwise statistical comparison.

Table A4.  ANOVA with post hoc multiple pairwise statistical comparison between compositions of selected unexpanded vermiculite ore samples examined in this study. 

Notes: Mg fraction = Mg/(Mg+Aloct +Feoct), tetrahedral Al fraction = (Altet + Si),  total Al, and total Fe are based on Electron Probe MicroAnalysis (EPMA) of the

...
Electron probe microanalysis analyses and resulting formula of an unexpanded VTx-1 Mg-vermiculite sample from Llano, Texas.
February 13, 2019

Electron probe microanalysis analyses and resulting formula.

Table A5.  Electron probe microanalysis analyses and resulting formula of an unexpanded VTx-1 Mg-vermiculite sample from Llano, Texas. 

Notes:

a Microprobe data for all Fe are binned into FeO.

b There are no data on H2O content. 

 Expanded vermiculite ores examined in this study: their sources and amphibole, talc, and/or serpentine impurities.
February 13, 2019

Expanded vermiculite ores examined in this study

Table 1.  Expanded vermiculite ores examined in this study: their sources and amphibole, talc, and/or serpentine impurities.

Notes: XRD = X-ray diffraction analysis of bulk ore samples (B) and sink fractions (S).  SEM-EDS = Scanning Electron Microscope – Energy-Dispersive X-Ray Spectroscopy.  Band Depth Ratio = 1.40/1.42-µm band depth ratio.  The use of "sodic-

...
Average EPMA chemical analyses and calculated mineral formulas of selected unexpanded vermiculite ores.
February 13, 2019

Average EPMA chemical analyses and calculated mineral formulas.

Table 2.   Average EPMA chemical analyses and calculated mineral formulas of selected unexpanded vermiculite ores.

Notes: Compositions of bulk samples not individual minerals.  n = number of microprobe spot analyses collected on multiple mica flakes used to calculate the averaged composition of each sample.   ---- = not enough cation Al and/or Mg to assign to this

...
Mössbauer spectral parameters obtained at 295 K for selected unexpanded vermiculite ore samples.
February 13, 2019

Mössbauer spectral parameters for vermiculite ore.

Table 3.  Mössbauer spectral parameters obtained at 295 K for selected unexpanded vermiculite ore samples.

Notes: IS = isomer shift; QS = quadrupole splitting; Width = absorption peak width; Area = % area of an absorption peak relative to other peaks in the spectrum.  

a Oh1 & Oh2 = 1st and 2nd octahedral Fe3+

...
Summary of OH-related mid-infrared (MIR) spectral features of unexpanded and expanded vermiculite ores.
February 13, 2019

Summary of OH-related mid-infrared (MIR) spectral features.

Table 5.  Summary of OH-related mid-infrared (MIR) spectral features of unexpanded and expanded vermiculite ores.

Notes: Vibrational positions from spectra of handpicked, ground mica flakes from the unexpanded GDS469 ore sample from Libby, MT; the unexpanded ALB5SA00 ore sample from Palabora, S. Africa; and the expanded vermiculite ores as noted.  Vibrational

...
 Vermiculite ore provenance diagrams for the four major historical sources.
November 6, 2017

Vermiculite ore provenance diagrams.

Figure 4. Vermiculite ore provenance diagrams for the four major historical sources: (a) Libby, Montana, (b) Palabora, South Africa, (c) Louisa, Virginia, and (d) Enoree, South Carolina based on compositions from electron probe microanalysis (EPMA).

News Releases, Technical Announcements, and other items of interest. Subscribe to the USGS Minerals News RSS feed to keep up with the latest news.

USGS Minerals News
Filter Total Items: 95
Date published: February 5, 2019

POSTPONED due to weather: Ask Questions and Learn More About the Low-Level Helicopter Flying Above the Mississippi Alluvial Plain

Media:            Please join the U.S. Geological Survey, CGG Airborne and various partners for a demonstration of the low-flying helicopter and description of what scientists are seeking in and around the Mississippi Alluvial Plain.

Date published: December 13, 2018

Seeking Water from Above: Low-Level Helicopter to Fly Southern Portion of Mississippi Alluvial Plain

Editor:  In the public interest and in accordance with Federal Aviation Administration regulations, the USGS is announcing this low-level airborne project.  Your assistance informing the local communities is appreciated.  

Date published: November 19, 2018

Low-flying Airplane to Map Geology of Southeast Missouri

Editor:  In the public interest and in accordance with Federal Aviation Administration regulations, the USGS is announcing this low-level airborne project.  Your assistance in informing the local communities is appreciated. 

Date published: November 8, 2018

Back and Forth: Ask Questions and Learn More About the Low-Level Helicopter Flying Above the Mississippi Alluvial Plain

Media:            Please join the U.S. Geological Survey, CGG Airborne, and various partners for a demonstration takeoff of the low-flying helicopter and description of what scientists are seeking in/around the Mississippi Alluvial Plain. Please RSVP to Heidi Koontz at 720-320-1246 or hkoontz@usgs.gov.

Date published: October 25, 2018

Seeking Water from Above: Low-Level Helicopter to Fly Above Mississippi Alluvial Plain

Editor:  In the public interest and in accordance with Federal Aviation Administration regulations, the USGS is announcing this low-level airborne project.  Your assistance informing the local communities is appreciated.  

Date published: September 3, 2018

Scientists Discover New Clues to Mount St. Helens Unusual Location

The atypical location of Mount St. Helens may be due to geologic structures that control where deep magmas can rise through the crust, as suggested by new findings published today in Nature Geoscience.

Date published: May 22, 2018

Digital Gold Rush Depends on Traditional Gold

In 1849, the discovery of gold in California sparked one of the most famous gold rushes in history. Thousands trekked across mountainous terrain to seek the precious metal, with entire industries springing up around the rush. In fact, the desire to understand our mineral resource wealth that led to the creation of the U.S. Geological Survey was in part fueled by gold rushes like this one.

Date published: May 18, 2018

Interior Releases 2018’s Final List of 35 Minerals Deemed Critical to U.S. National Security and the Economy

The Department of the Interior today published a list of 35 mineral commodities considered critical to the economic and national security of the United States. This list will be the initial focus of a multi-agency strategy due in August this year to implement President Donald J. Trump's Executive Order to break America's dependence on foreign minerals

Date published: April 5, 2018

USGS Scientists Develop New Tool to Determine if Vermiculite Insulation Contains Asbestos

U.S. Geological Survey scientists and partners have created an onsite, time-saving technique for building inspectors to ascertain whether vermiculite insulation contains amphibole asbestos. The findings are featured in the April 2 edition of American Mineralogist.

Date published: March 1, 2018

Media Advisory: Low-Flying Airplane to Study Geology of the Central Upper Peninsula, Michigan

Residents and visitors may witness a low-flying airplane above the broader Iron Mountain-Escanaba-Marquette region starting at the beginning of April, 2018.

Date published: February 16, 2018

Interior Seeks Public Comment on Draft List of 35 Minerals Deemed Critical to U.S. National Security and the Economy

List includes minerals key to all sectors of economy including tech and defense

We welcome your inquires about our research and data. Please contact us directly and follow us on our Twitter and Instagram accounts.

Contact Us

Our Program collaborates with States, Industry, and Academia, as well as International organizations, on most research.

Filter Total Items: 37