Ludington, Stephen D.

About the author

U.S. Geological Survey, Western Region, Southwest area, Geology discipline
Aeromagnetic surveying, Atomic emission spectroscopy, Bedrock geologic units, Chemical analysis, Coal resources, Copper, Economic geology, Environmental assessment, Field sampling, Geochemistry, Geochronology, Geologic contacts, Geologic history, Geologic maps, Geologic structure, Geology, Geophysics, Geospatial analysis, Geospatial datasets, Geothermal resources, Gold, Gravitational field (earth), Igneous rocks, Lead, Magnetic field (earth), Maps and atlases, Mathematical simulation, Metallic mineral resources, Mineral deposits, Mineral resources, Molybdenum, Natural resource assessment, Natural resource exploration, Nonmetallic mineral resources, Ore formation, Plutonic rocks, Potassium, Potassium-argon analysis, Rocks and deposits, Rubidium-strontium analysis, Silver, Soil chemistry, Surficial geologic units, Tectonic processes, Tin, Tungsten, Unconsolidated deposits, Uranium, Uranium-lead analysis, Uranium-thorium analysis, Volcanic rocks, Zinc, Faults, Mine sites, Mineral deposit areas, Evaporite, Porphyry, Aluminum, Asbestos, Barium-Barite, Boron-Borates, Chromium, Clay, Copper, Fluorine-Fluorite, Gemstone, Emerald, Gold, Graphite, Gypsum-Anhydrite, Iron, Lead, Limestone, Manganese, Mercury, Molybdenum, Phosphorus-Phosphates, Potassium, Sand and Gravel, Sodium, Halite, Stone, Dimension, Sulfur, Talc-Soapstone, Thorium, Tin, Tungsten, Uranium, Zinc, Rare earth elements, ARC/INFO grid export format, ArcInfo GRID format, ArcInfo coverage, ArcInfo interchange, DBF, FileMaker, HTML table, KML, Microsoft Access format, Microsoft Excel format, MrSID image format, OGC WFS, OGC WMS, Portable Document Format, Comma-delimited text, File geodatabase (ESRI), Shapefile, Tab-delimited text

Geochemical analyses of geologic materials from areas of critical environmental concern, Clark and Nye counties, Nevada

Results of analysis in tabular form

Info
Preliminary integrated geologic map databases for the United States: California, Nevada, Arizona, Washington, Oregon, Idaho, and Utah

Digital geologic map information with a consistent set of attributes, part of a national compilation of similar maps. Available in formats compatible with GIS.

Info
Climax-type porphyry molybdenum deposits

Descriptive mineral deposit model, with locations of known deposits of this type and a few site characteristics.

Info
Low-fluorine stockwork molybdenite deposits

Descriptive mineral deposit model, with locations of known deposits of this type and a few site characteristics.

Info
Porphyry copper assessment of the Mesozoic of East Asia--China, Vietnam, North Korea, Mongolia, and Russia

This study delineated permissive areas for undiscovered porphyry copper deposits, compiled a database of known deposits and significant prospects, estimated undiscovered deposits within those areas and made probabilistic estimates of their metal content.

Info
Porphyry copper assessment of the Tibetan Plateau, China

This study delineated permissive areas for undiscovered porphyry copper deposits, compiled a database of known deposits and significant prospects, estimated undiscovered deposits within those areas and made probabilistic estimates of their metal content.

Info
Giant porphyry-related metal camps of the world

Database of large-tonnage, generally low-grade, hydrothermal deposits related to igneous intrusions emplaced at high crustal levels. Includes tri-partite classification based on deposit type, metal commodities, and source/host pluton chemistry.

Info
Preliminary non-fuel mineral resource assessment of Afghanistan 2007

Description and estimated amounts of resources with supporting data for use in GIS

Info
Porphyry copper assessment of northeast Asia: Far East Russia and northeasternmost China

This study delineated permissive areas for undiscovered porphyry copper deposits, compiled a database of known deposits and significant prospects, estimated undiscovered deposits within those areas and made probabilistic estimates of their metal content.

Info
Database of significant deposits of gold, silver, copper, lead, and zinc in the United States

It has long been recognized that the largest mineral deposits contain most of the known mineral endowment (Singer and DeYoung, 1980). Sometimes called giant or world-class deposits, these largest deposits account for a very large share of historic and cur

Info
Multielement geochemical dataset of surficial materials for the northern Great Basin

Geochemical data generated during mineral and environmental assessments for the Bureau of Land Management in northern Nevada, northeastern California, southeastern Oregon, and southwestern Idaho.

Info
Geophysical terranes of the Great Basin and parts of surrounding provinces

A set of geophysical maps with anomalies that are labeled and keyed to tables containing information on each anomaly and its source.

Info
Global mineral resource assessment--porphyry copper assessment of Mexico

Includes known resources and permissive tracts with estimates of the number of undiscovered resources likely to be present in the permissive tracts.

Info
Porphyry copper assessment of Central America and the Caribbean Basin

Study delineated permissive areas for undiscovered porphyry copper deposits, compiled a database of known deposits and significant prospects, estimated undiscovered deposits within those areas and made probabilistic estimates of their metal content.

Info
National Geochronological Database

Radiometric ages of geological materials by K-Ar, Rb-Sr, Sm-Nd, fission track, and U-Th-Pb dating methods. A revision of DDS-14 correcting locations and providing the data in more convenient formats.

Info
National Geochronological Database

Radiometric ages of geological materials by K-Ar, Rb-Sr, Sm-Nd, fission track, and U-Th-Pb dating methods. A revision of DDS-14 correcting locations and providing the data in more convenient formats.

Info
Porphyry copper assessment of British Columbia and Yukon Territory, Canada

GIS files representing the mineral resource assessment permissive tracts, deposits and significant prospects.

Info
Porphyry copper assessment of Southeast Asia and Melanesia

This study delineated permissive areas for undiscovered porphyry copper deposits, compiled a database of known deposits and significant prospects, estimated undiscovered deposits within those areas and made probabilistic estimates of their metal content.

Info
Porphyry copper assessment of East and Southeast Asia: Philippines, Taiwan (Republic of China), Republic of Korea (South Korea), and Japan

This study delineated permissive areas for undiscovered porphyry copper deposits, compiled a database of known deposits and significant prospects, estimated undiscovered deposits within those areas and made probabilistic estimates of their metal content.

Info
Evaporite-related potash resources: deposits and permissive tracts worldwide

Includes descriptions of 981 known occurrences and deposits as well as qualitative assessment of undiscovered resource potential in 84 permissive tracts.

Info
Potash: a global overview of evaporate-related potash resources, including spatial databases of deposits, occurrences, and permissive tracts

Locations and descriptions of known occurrences, with qualitative assessment of the development potential of permissive tracts where undiscovered deposits of this type may occur.

Info
Geology and mineral resources of the Sheldon-Hart Mountain National Wildlife Refuge Complex (Oregon and Nevada), the Southeastern Oregon and North-Central Nevada, and the Southern Idaho and Northern Nevada (and Utah) Sagebrush Focal Areas

Info