Layers:

Layer: Mine Locations (0)

Name: Mine Locations

Display Field: SITE_NAME

Type: Feature Layer

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Description: Mineral resource occurrence data covering the world, most thoroughly within the U.S. This database contains the records previously provided in the Mineral Resource Data System (MRDS) of USGS and the Mineral Availability System/Mineral Industry Locator System (MAS/MILS) originated in the U.S. Bureau of Mines, which is now part of USGS. The MRDS is a large and complex relational database developed over several decades by hundreds of researchers and reporters. This product is a digest in which the fields chosen are those most likely to contain valid information. CGS NOTES: This file contains points (vector format) situated within a study area that encompasses all twelve California Department of Transportation Districts as well as small adjacent areas of Oregon and Nevada. The points represent locations of mines and prospects derived and edited from the companion feature class MRDSMinesORIGINAL_AllDistricts, which was extracted from the U.S. Geological Survey Mineral Resources Data System (MRDS); additional records of mines have been added to this data set by staff of the California Geological Survey. The intent of editing of the original MRDS data was mainly to remove multiple records that represent the same mine or prospect or to improve accuracy of locations of these features. Additional features related to mining activity are available in the companion TOMS feature classes.

Service Item Id: 5c46fa2eac7a41b4992d8702ab62ceba

Copyright Text: Hundreds of people have contributed to the development of MRDS and MAS/MILS over several decades. The present digest owes much of its coherence to Bill Ferguson, Bruce Lipin, and Paul Schruben of USGS. CGS NOTES: Report by Chris T. Higgins and Ronald K. Churchill.

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Layer: Geothermal Wells (1)

Name: Geothermal Wells

Display Field: WELLNAME

Type: Feature Layer

Geometry Type: esriGeometryPoint

Description: This file contains points (vector format) situated within a study area that encompasses all twelve California Department of Transportation Districts. The points represent locations of geothermal wells derived from statewide databases of the California Division of Oil, Gas, and Geothermal Resources (CDOGGR), which was renamed the California Geologic Energy Management Division (CalGEM) in 2020.

Service Item Id: 5c46fa2eac7a41b4992d8702ab62ceba

Copyright Text: Report by Chris T. Higgins and Ronald K. Churchill.

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Layer: Oil Gas Seeps (2)

Name: Oil Gas Seeps

Display Field: SEEPNAME

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Description: This file contains points (vector format) situated within a study area that encompasses all twelve California Department of Transportation Districts. The points represent locations of oil and natural-gas seeps derived from a statewide database of the U.S. Geological Survey (USGS). Several additional seeps were appended to this database based on field observations by CGS staff.

Service Item Id: 5c46fa2eac7a41b4992d8702ab62ceba

Copyright Text: Report by Chris T. Higgins and Ronald K. Churchill.

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Layer: Thermal Springs (3)

Name: Thermal Springs

Display Field: SPRINGNAME

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Description: This file contains points (vector format) situated within a study area that encompasses all twelve California Department of Transportation Districts. The points represent locations of thermal springs derived from the statewide Calhot database of the California Division of Oil, Gas, and Geothermal Resources (CDOGGR), which was renamed the California Geologic Energy Management Division (CalGEM) in 2020. It also includes additional thermal springs and fumaroles derived from field observations, topographic maps, and technical maps and reports.

Service Item Id: 5c46fa2eac7a41b4992d8702ab62ceba

Copyright Text: Report by Chris T. Higgins and Ronald K. Churchill.

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Layer: Faults (Possible NOA) (4)

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Description: This file contains lines (vector format) situated within a study area that encompasses all twelve California Department of Transportation Districts. The lines represent locations of faults that are either exposed at the ground surface or are concealed. Faults are interpreted to be of particular interest to Caltrans because of their greater potential as sources of mineral hazards; in places they may be the sites of anomalously high concentrations of different types of mineralization. NOTE: Some districts in this statewide feature class include faults that overlap from the study areas of adjacent districts. Rather than deleting these overlapping faults, they have been retained in this feature class. In some cases, these overlapping faults were derived from the same geologic sources used to compile the faults in both districts and thus identically coincide with those in the district that is overlapped. In other cases, the overlapping faults may not coincide because they were derived from geologic sources that are different from those used in the district that is overlapped.

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Layer: Surface Water Flow Direction (5)

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Description: This file contains polygons (vector format) situated within a study area that encompasses all twelve California Department of Transportation Districts. The polygons are arrows that represent generalized directions of drainage within watersheds in the districts.

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Layer: Mining Districts (6)

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Description: This file contains polygons (vector format) situated within a study area that encompasses all twelve California Department of Transportation Districts. The polygons represent areas interpreted to be of particular interest to Caltrans because of their greater potential as sources of mineral hazards. Identified as "areas of potential mineralogical concern," they include sites of significant mining districts or known mineralized areas.

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Layer: NOA Rock Units (7)

Name: NOA Rock Units

Display Field: NAME

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Description: This file contains polygons (vector format) situated within a study area that encompasses all twelve California Department of Transportation Districts. The polygons represent areas of numerous rock units, including, among others, serpentinite/ultramafic rock, Monterey Formation, gabbro, carbonate rock, and Franciscan Complex. Landslide deposits associated with all of these rock units are also shown. Identified as "areas of potential mineralogical concern," these rocks are interpreted to be of particular interest to Caltrans because of their greater potential as sources of mineral hazards. It is important to recognize that if a specific locality falls within a colored area shown on this layer it does not necessarily mean that the locality will have a mineral hazard. Conversely, if a locality falls outside a colored area it does not necessarily mean that locality will not have a mineral hazard. See the individual district reports for further information and details on the rock units as potential sources of mineral hazards.

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Layer: Mining Disturbed Areas (8)

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Description: This file contains polygons (vector format) situated within a study area that encompasses all twelve California Department of Transportation Districts. The polygons represent areal depictions of mining features derived from U.S. Geological Survey 7.5-minute topographic maps.

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