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Search indexed USGS publications on groundwater, aquifers, geologic maps, mineral resources and earthquakes. Explore source records by subject and place.

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At least 19 recordsLinked to original sources
USGS1994

Aeromagnetic map of the Stockton 1:100,000-scale quadrangle, California

The accompanying aeromagnetic map is part of the San Francisco Bay area National Geologic Mapping Project and is intended to promote further understanding of the geology in the Stockton 1:100,000-scale quadrangle, California, by serving as a basis for geophysical interpretations and by supporting geological mapping, mineral resource investigations, and topical studies. Local spatial variations in the Earth's magnetic field (evident as anomalies on aeromagnetic maps) reflect the distribution of magnetic minerals, primarily magnetite, in the underlying rocks. The volume content of magnetic minerals often can be related to rock type, and abrupt spatial changes in the amount of magnetic minerals commonly mark lithologic boundaries.

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USGS1962

Bismuth in the United States, exclusive of Alaska and Hawaii

The bismuth-bearing deposits in the United States (exclusive of Alaska and Hawaii) are shown on the accompanying map. In compiling the map the deposits were classified into two categories: 1) those that have produced bismuth or are regarded as potential sources based on available information (in general, this category includes the minable base- and precious-metal depos its whose ores or concentrates are reported to contain at least 0.02 percent bismuth); and 2) deposits that have been reported to contain bismuth but which are either unappraised or are regarded as having no potential importance as sources of the metal. The map also shows by stipple pattern various segments of the southern Piedmont gold belt, which extends from northern Virginia southwestward to Alabama. Numerous gold deposits within this belt contain very minor quantities of bismuth and are, therefore, of general interest. Each deposit or group of deposits is numbered on the map by state and identified in the index. The index gives the name of each locality, the coordinates to the nearest minute of latitude and longitude, the principal metals in the ore, a very brief geologic description, and references to published reports if any. Both published and unpublished data have been used in compiling this map.

Mineral Investigations Resource Map↗
USGS1963

Niobium and tantalum in the United States, exclusive of Alaska and Hawaii

The accompanying map shows the location of the principal known deposits of niobium and tantalum minerals in the United States, exclusive of Alaska and Hawaii. Symbols of different shapes are used to depict deposits of different geologic types, and large symbols denote deposits with a record of production. Small symbols denote known occurrences of the minerals. Individual symbols may represent districts or groups of deposits too closely spaced to permit them to be distinguished separately because of scale limitations. Some districts or areas of widespread occurrences are shown by a shaded pattern. The deposits are numbered by states on the map and identified by number in the index, which also gives the geographic coordinates of the deposits, brief geologic descriptions, and references to the principal published reports if such exist. Both published information and unpublished data gathered by the U. S. Geological Survey were used in preparing the map and text.

Mineral Investigations Resource Map↗
USGS1962

Chromite in the United States, exclusive of Alaska and Hawaii

The chromite deposits in the United States (exclusive of Alaska and Hawaii) are shown on the accompanying map. In compiling the map, the deposits were classified in five size categories according to the estimated total quantity of chromite present before mining. The map shows, by different symbols, deposits of chromite in ultramafic rocks, beach sands in which chromite is an important constituent, and lateritic iron ores in which chromium has been concentrated by weathering of peridotite in situ. Although geologically significant amounts of chromium are known to occur in some gabbros and sedimentary rocks other than beach sands and laterite, the data are too fragmentary to show on the map.

Mineral Investigations Resource Map↗
USGS1965

Tin in the United States, exclusive of Alaska and Hawaii

The principal deposits and occurrences of tin minerals in the United States (exclusive of Alaska and Hawaii) are shown on the accompanying map. Although some very minor occurrences are included to indicate the extent of distribution, those in which only trace amounts of tin have been found spectrographically or geochemically have been omitted. Unverifiable reported occurrences of tin-bearing minerals have been excluded also. Known tin-bearing deposits in the conterminous United States are small, few in number, and widely scattered; only small amounts of tin concentrates are being recovered at the present time (1964). The total amount of metallic tin produced since 1950, mainly as a by-product of molybdenum ores, is less than 500 tons, and the total production from all sources prior to 1950 is similar. Map locations are shown by symbols, the shapes of which denote different geologic types of occurrence; some areas of scattered occurrences in pegmatites are shown by a stippled pattern. Occurrences are numbered by State on the map and identified by number in the index. The index also gives the geographic coordinates, brief geologic descriptions, and references to the principal published reports. The more important or better known localities are named on the map.

Mineral Investigations Resource Map↗
USGS1962

Borates in the United States, exclusive of Alaska and Hawaii

This map shows the location of borate deposits in the United States (exclusive of Alaska and Hawaii). Because all the known borate deposits of the United States of any historic or present economic importance occur in California, western Nevada, and southern Oregon, this map covers only the western part of the country.

Mineral Investigations Resource Map↗
USGS1963

High-alumina kaolinitic clay in the United States, exclusive of Alaska and Hawaii

The general distribution of high-alumina kaolinitic clay deposits in the United States (exclusive of Alaska and Hawaii) is shown on the accompanying map. The locations of mines, pits, and prospects are shown by appropriate symbols. Certain clay-bearing areas are shown by patterns that designate the geologic age of the deposits. The locations are numbered consecutively by states and are keyed to an index which lists the name of the deposit, county, and principal references. Only significant references on the size, quality, and geologic occurrence of deposits are listed. Some of the data for the map and index were compiled by John W. Hosterman and the late Leona Boardman.

Mineral Investigations Resource Map↗
USGS1962

Gold in the United States, exclusive of Alaska and Hawaii

The accompanying map shows the distribution of the principal gold mining districts in the United States (excluding Alaska and Hawaii). Only those districts that have produced 10,000 ounces of gold or more are shown. Gold ore reserves were not considered, and the types of deposits are not shown. Based on total output, the gold-producing districts have been classified into three categories on the map: (1) those that have an output of 10,000 to 100,000 ounces, (2) those with an output of 100,000to 1,000,000 ounces, and (3) and those with an output of more than 1,000,000 ounces. Each category is represented by a particular map symbol, and the symbol is placed at the approximate center of the mining district.

Mineral Investigations Resource Map↗
USGS1962

Mercury in the United States, exclusive of Alaska and Hawaii

This map shows the location of mercury districts and deposits in the United States (exclusive of Alaska and Hawaii). The map was compiled from published reports and from data in the files of the Geological Survey. All map locations are numbered consecutively in each state and names, geographic coordinates, and selected references are given in the Index.

Mineral Investigations Resource Map↗