Airborne magnetic and radiometric survey, Boulder Batholith region, Montana, 2022

Dates

Publication Date: 2024-04-22
Start Date: 2022-06-11
End Date: 2022-08-22

Citation

Allen Langhans, A.D., Drenth, B.J., and Connell, D.M., 2024, Airborne magnetic and radiometric survey, Boulder Batholith region, Montana, 2022: U.S. Geological Survey data release, https://doi.org/10.5066/P13JSLF6.

Summary

This data release provides digital flight line data for a high-resolution airborne magnetic and radiometric survey over parts of Montana in the vicinity of the Boulder Batholith. The airborne survey was jointly funded by the Earth Mapping Resources Initiative and Kennecott Exploration Company. The survey was designed to meet complementary needs related to geologic mapping and characterization of mineral resource potential. A total of 34,041 line km of magnetic and radiometric data were acquired over an irregular-shaped area of 6178 km. Data were collected from a helicopter flown at a nominal terrain clearance of 100 meters (m) above topography along E-W flight lines spaced at 200 m intervals. Tie lines were flown in an N-S direction [...]

Summary

This data release provides digital flight line data for a high-resolution airborne magnetic and radiometric survey over parts of Montana in the vicinity of the Boulder Batholith. The airborne survey was jointly funded by the Earth Mapping Resources Initiative and Kennecott Exploration Company. The survey was designed to meet complementary needs related to geologic mapping and characterization of mineral resource potential. A total of 34,041 line km of magnetic and radiometric data were acquired over an irregular-shaped area of 6178 km. Data were collected from a helicopter flown at a nominal terrain clearance of 100 meters (m) above topography along E-W flight lines spaced at 200 m intervals. Tie lines were flown in an N-S direction every 2000 m. Data were collected by Sander Geophysics Limited (SGL), and Dewberry Engineers, Inc. under contract with the USGS using a helicopter with a magnetometer mounted in a stinger and a fully calibrated gamma-ray spectrometer. The survey operated out of the Butte, Montana, airport from June of 2022 to August of 2022. Files that are available in this publication include flight line data for the magnetic survey, flight line data for the radiometric survey and a report describing the survey parameters, field operations, quality control and data reduction procedures. A zip file is provided that contains the contractor's deliverable products that includes Geosoft databases and grids for the magnetic and radiometric survey and the report describing the survey and data reduction.

Version History
First release: July, 2023
Version 2: April, 2024

Version 2
This project was jointly funded by the US Geological Survey Earth Mapping Resources Initiative and Kennecott Exploration Company. The original data release (July, 2023) consisted of USGS-funded data only. Data that were added to the data release on April, 2024, which consisted of aeromagnetic and radiometric data, were funded by Kennecott Exploration Company and was withheld from the original release as proprietary data. This revision includes all data acquired as part of the survey.

Changes from previous version:
1) Added aeromagnetic and radiometric data funded by Kennecott Exploration Company.
2) Updated metadata to reflect the extent of the full data release.
3) Updated spatial reference .shp files to reflect the extent of the full data release.
4) Updated contractor report and deliverables to reflect the extent of the full data release.
5) Updated geotiffs to reflect the extent of the full data release.

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Contacts

Point of Contact :: Benjamin J Drenth
Originator :: April D Allen Langhans, Benjamin J Drenth, Dylan M Connell
Metadata Contact :: April D Allen Langhans, GS GGGSC DM Team
Publisher :: U.S. Geological Survey
USGS Program :: Mineral Resources Program
Distributor :: U.S. Geological Survey - ScienceBase
SDC Data Owner :: Geology, Geophysics, and Geochemistry Science Center
USGS Mission Area :: Energy and Minerals

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Metadata_AirborneMagneticAndRadiometricSurveyBoulderBatholithMT2022.xml Original FGDC Metadata	View	30.55 KB	application/fgdc+xml
ContractorsReport_AirborneMagneticAndRadiometricSurveyBoulderBatholithMT2022.pdf “Contractor Report”		6.79 MB	application/pdf
TotalMagAndTernary_AirborneMagneticAndRadiometricSurveyBoulderBatholithMT2022.png “Montana Boulder Batholith Overview”		667.12 KB	image/png
“Contractor Deliverables”		4.27 GB	application/zip
VersionReadMe_AirborneMagneticAndRadiometricSurveyBoulderBatholithMT2022.txt “Version Read Me”		1.32 KB	text/plain

Shapefile: FootPrint_AirborneMagneticAndRadiometricSurveyBoulderBatholithMT2022.zip
FootPrint_AirborneMagneticAndRadiometricSurveyBoulderBatholithMT2022.dbf		75 Bytes
FootPrint_AirborneMagneticAndRadiometricSurveyBoulderBatholithMT2022.GeosoftMeta		3.69 KB
FootPrint_AirborneMagneticAndRadiometricSurveyBoulderBatholithMT2022.prj		451 Bytes
FootPrint_AirborneMagneticAndRadiometricSurveyBoulderBatholithMT2022.shp “Survey Footprint Shapefile”		2.06 KB
FootPrint_AirborneMagneticAndRadiometricSurveyBoulderBatholithMT2022.shx		108 Bytes

Shapefile: LinePath_AirborneMagneticAndRadiometricSurveyBoulderBatholithMT2022.zip
LinePath_AirborneMagneticAndRadiometricSurveyBoulderBatholithMT2022.dbf		13.6 KB
LinePath_AirborneMagneticAndRadiometricSurveyBoulderBatholithMT2022.GeosoftMeta		3.69 KB
LinePath_AirborneMagneticAndRadiometricSurveyBoulderBatholithMT2022.prj		451 Bytes
LinePath_AirborneMagneticAndRadiometricSurveyBoulderBatholithMT2022.shp “Survey Flightlines Shapefile”		11.23 MB
LinePath_AirborneMagneticAndRadiometricSurveyBoulderBatholithMT2022.shx		12.13 KB

Related External Resources

Type: Citation

Day, W.C., 2019, The Earth Mapping Resources Initiative (Earth MRI)—Mapping the Nation’s critical mineral resources (ver. 1.2, September 2019): U.S. Geological Survey Fact Sheet 2019–3007, 2 p., https://doi.org/10.3133/fs20193007.	https://doi.org/10.3133/fs20193007

Type: Web Link

Earth Mapping Resources Initiative (Earth MRI)	https://www.usgs.gov/special-topics/earth-mri

Purpose

Data was collected as part of the Earth Mapping Resource Initiative (Earth MRI) program of the U.S. Geological Survey (USGS) in collaboration with Kennecott Exploration Company to better understand the geology and critical mineral resources in the area. The primary goal of the airborne magnetic and radiometric survey is to map lateral variations of magnetization and natural radioactivity that are related to differences in rock and soil type, and to aid surface and subsurface geologic mapping.

Airborne magnetic and radiometric survey, Boulder Batholith region, Montana, 2022

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