Mathematical modeling

Creating mathematical expressions to represent a simplified view of real-world systems.
This category is also used for fractal geometric methods, groundwater flow modeling, modeling (mathematical), and numerical methods.
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Water and rock geochemistry, geologic cross sections, geochemical modeling, and groundwater flow modeling for identifying the source of groundwater to Montezuma Well, a natural spring in central Arizona

This report releases data, cross section, and model information related to the identification of travel paths for groundwater supply and principal stratigraphic and structural features that serve as constraints or conduits for groundwater movement.

Computer programs for forward and inverse modeling of acoustic and electromagnetic data

Source code and executables for Windows 7 64-bit; these command-line applications are likely portable to Linux as well. Memory intensive code, uses multiple processors.

Modeling of the Climax Stock and related plutons based on the inversion of magnetic data, southwest Nevada

Mathematical modeling, coupled with new observations of magnetic susceptibility, yield better estimates of the underground configuration of granite plutons.

A bibliography of some geophysical computer programs, databases, and maps from the U.S. Geological Survey, 1971-1994

A collection of references of geophysical computer programs, databases, and maps from the USGS

Aeromagnetic expression of buried basaltic volcanoes near Yucca Mountain, Nevada

Mathematical modeling and analysis of aeromagnetic anomaly data (gridded data provide in another report).

Airborne electromagnetic data and processing within Leach Lake Basin, Fort Irwin, California

Releases airborne survey data, resistivity cross-sections and depth slices derived from data inversion. Resulting resistivity models confirm geologic framework, constrain hydrostratigraphy and depth to basement, and reveal fault and fold distribution.

Alteration, slope-classified alteration, and potential lahar inundation maps of volcanoes for the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Volcano Archive

Identifies hydrothermally altered volcanic edifices and vulnerable areas downstream by mapping alteration on volcanoes, highlighting lahar prone watersheds using Global Digital Elevation Model data, and modeling via a lahar flow-fill modeling program

Assessment of undiscovered copper resources associated with the Permian Kupferschiefer, Southern Permian Basin, Europe

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.

Descriptive models, grade-tonnage relations, and databases for the assessment of sediment-hosted copper deposits--with emphasis on deposits in the Central Africa Copperbelt, Democratic Republic of the Congo and Zambia

This report describes compilation and evaluation results of data from the USGS global mineral assessment including new descriptive mineral-deposit and grade and tonnage models and spatial databases for deposits and occurrences, ore bodies and open pits.

Digital data from the Great Sand Dunes and Poncha Springs aeromagnetic surveys, south-central Colorado

Two high-resolution aeromagnetic surveys in south-central Colorado compiled to assess the subsurface geologic framework of the San Luis basin for ground-water flow model construction, and to map concealed faults potentially related to geothermal resources

Economic filters for evaluating porphyry copper deposit resource assessments using grade-tonnage deposit models, with examples from the U.S. Geological Survey global mineral resource assessment

This paper reports on a methodology that is used with estimates of undiscovered copper resources to evaluate the likely contribution that the predicted resources will make to mineral supplies in the foreseeable future.

Geophysical Characterization of Subsurface Properties Relevant to the Hydrology of the Standard Mine in Elk Basin, Colorado

To help understand the hydrogeologic controls in the basin and how they affect surface and groundwater interactions with nearby mine workings, electrical resistivity profile, self–potential, and magnetic measurement data are provided herein.

Geophysical investigation of Red Devil mine using direct-current resistivity and electromagnetic induction, Red Devil, Alaska, August 2010

This large producer of mercury operated from 1933 to 1971. As part of remediation work, this survey used electromagnetic methods to study subsurface resistivity.

Geospatial database for regional environmental assessment of central Colorado

Study focusing on the effects of historical mining on Forest Service lands in this area.

Global Mineral Resource Assessment

Regional locations and estimates of the probable amounts of undiscovered resources of copper, platinum-group elements, and potash in selected types of mineral deposits to depths of 1 to 3 kilometers below the surface of the earth worldwide.

Global Mineral Resource Assessment-Aggregation of estimated numbers of undiscovered deposits-an R-script with an example from the Chu Sarysu Basin, Kazakhtan

This report provides a script developed in open-source statistical software, R, that aggregates undiscovered deposit estimates of a given type assuming some degree of correlation among aggregated areas, provided a user-specified correlation matrix.

High-angle faults in the basement of Yucca Flats, Nevada Test Site, Nevada, based on analysis of a constrained gravity inversion surface

A fault map and digital fault dataset were constructed based on offsets of the basement surface. Because these faults are, in large part, not present at the surface, they are interpreted to be inactive faults, older than the alluvial basin fill.

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.

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.

Porphyry copper assessment of eastern Australia

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.

Porphyry copper assessment of Europe, exclusive of the Fennoscandian Shield

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

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.

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.

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.

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.

Porphyry copper deposits of the world

Information on porphyry copper deposits from around the world with grade and tonnage models, a general classification based on geologic setting, mineralogy, with data allowing locations of these deposits to be plotted using GIS.

Porphyry copper deposits of the world: database, map, and grade and tonnage models

A compilation of worldwide mineral deposits of this type. This older version was revised and updated in OFR-2008-1155.

Porphyry copper deposits of the world: database, maps, and preliminary analysis

A compilation of worldwide mineral deposits of this type. This older version was revised and updated in OFR-2008-1155.

Porphyry copper deposits of the world; database and grade and tonnage models, 2008

Revised and updated information about mineral deposit models for porphyry copper deposits to facilitate assessment of undiscovered resources

Potential-field geophysical software for the PC, version 2.2

Preliminary gravity inversion model of Frenchman Flat Basin, Nevada Test Site, Nevada

Provides data for the depth below the land surface,in meters, of the modeled location of the Pre-Tertiary basement surface.

Preliminary potential-field constraints on the geometry of the San Fernando basin, southern California

Results of mathematical modeling of gravity and magnetic anomaly data to infer the geologic structure of the area

Sandstone copper assessment of the Chu-Sarysu Basin, Central Kazakhstan

This study delineated permissive areas for undiscovered sandstone 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.

Sandstone copper assessment of the Teniz Basin, Kazakhstan

Time-domain electromagnetic surveys at Fort Irwin, San Bernardino County, California, 2010-12

Describes electromagnetic sounding locations, data acquisition, calibration, and modeling; compares data to borehole data, correlating model results; and summarizes the applications and limitations of the TEM method. Examples of models are provided.

Users guide to Handlens--A computer program that calculates the chemistry of minerals in mixtures