Burns, L.E.
Barefoot, J.D.
Graham, G.R.C.
Fugro Airborne Surveys Corp.
Stevens Exploration Management Corp.
2019
Western Fortymile electromagnetic and magnetic airborne geophysical survey data compilation
digital data
Geophysical Report
GPR 2019-7
Fairbanks, Alaska, United States
Alaska Division of Geological & Geophysical Surveys
12 p.
http://doi.org/10.14509/30178
Western Fortymile electromagnetic and magnetic airborne geophysical survey is located in eastern Alaska in the Fortymile mining district, about 225 kilometers east of Fairbanks, Alaska. Frequency domain electromagnetic and magnetic data were collected with the DIGHEMV system in September 2007. A total of 1825.9 line kilometers were collected covering 646.3 square kilometers. Line spacing was 400 meters (m). Data were collected 30 m above the ground surface from a helicopter towed sensor platform ('bird') on a 30 m long line. The data, as well as additional metadata, are available from the DGGS website: http://doi.org/10.14509/30178.
This airborne geophysical survey is part of a program to acquire data on Alaska's most promising mineral belts and districts. The information acquired is aimed at catalyzing new private sector exploration, discovery, and ultimate development and production. The purpose of the survey was to map the magnetic and conductive properties of the survey area. Mineralization prospects in the district includes the LWM, Fish, Eva, and Drumstick silver-lead-zinc-copper prospects. Other gold and base-metal anomalies, altered zones, favorable lithologies, and structural zones are known to exist throughout the survey area.
>ascii_data: ASCII format line data, other ASCII data
>databases_geosoft: Geosoft format database of line data, other Geosoft format databases
>documents: Project and field reports, survey background information, gridded data explanations, other supporting documentation
>grids_ermapper: Geographically registered gridded data, ER Mapper ERS format
>grids_geosoft: Geosoft-format binary grids, these grids can be viewed in ESRI ArcMap using a free plugin from Geosoft or using the free viewer available from Geosoft
>images_registered: GeoTiff format images of all gridded data
>kmz: Keyhole markup language (kml) kmz archive files of project data. Viewable in Google Earth and other compatible programs
>maps_pdf_format: Printable maps in pdf format
>maps_prn_format: Printable maps in HPGL/2 printer file format with extension .prn
>profiles_stacked: Distance-based profiles of the digitally recorded geophysical data are generated and plotted at an appropriate scale. The profiles display electromagnetic anomalies with their respective interpretive symbols
>vector_data: Line path, data contours, and survey boundary in ESRI shapefile (SHP) format, ESRI Geodatabase format, and/or AutoCAD dxf format
>video_flightpath: Survey flight path downward-facing video
2007
ground condition
None planned
-143.394299
-142.612966
64.369818
63.937472
ISO 19115 Topic Category
geoscientificInformation
Alaska Division of Geological & Geophysical Surveys
Aeromagnetic
Aeromagnetic Data
Aeromagnetic Map
Aeromagnetic Survey
Airborne Geophysical Survey
Analytic Signal
Apparent Resistivity Data
Apparent Resistivity Map
Apparent Resistivity Survey
Conductivity Survey
Electromagnetic Data
Electromagnetic Survey
Exploration
First Vertical Derivative
Frequency Domain Electromagnetic Data
Geologic
Geology
Geophysical Map
Geophysical Survey
Geophysics
Geophysics Search Tag
Gridded Data
Line Data
Magnetic Data
Magnetic Survey
Magnetics
Remote Sensing
Resistivity
Resistivity Survey
Alaska Division of Geological & Geophysical Surveys
Caribou Creek
Drumstick Prospect
East Eva Prospect
Eva Creek Prospect
Eva Prospect
Fish Creek
Fish Prospect
Fortymile Mining District
Gold Bottom Creek
Gold Creek
Iron Creek
Kechumstuk Creek
Ketchumstuk Prospect
LWM Prospect
Little Enchilada Prospect
Little Whiteman Creek Prospect
Little Whiteman Prospect
Mckinley Creek
Missoula Creek
Mitchell Prospect
Molly Creek
Molly Creek Prospect
Mount Veta
My Creek Prospect
Norvell Creek
Oscar Prospect
Oscar West Prospect
Ruby Silver Prospect
Sheba Mountain
Silver Bow Creek
Telegraph Creek
Texas Creek Prospect
Van Milligan Creek
Veta Creek
Watson Fork
West LWM Prospect
This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.
Alaska Division of Geological & Geophysical Surveys
Metadata Manager
mailing and physical
3354 College Road
Fairbanks
AK
99709-3707
USA
(907)451-5020
(907)451-5050
dggspubs@alaska.gov
8 am to 4:30 pm, Monday through Friday, except State holidays
Funding was provided by the U.S. Bureau of Land Management (BLM).
DGGS Staff
2014
Airborne GeophysWeb: A compilation of geophysical data from DGGS and cooperating agencies
Digital Data Series
DDS 2
Fairbanks, Alaska, United States
Alaska Division of Geological & Geophysical Surveys
http://doi.org/10.14509/27222
Geoterrex-Dighem
Fugro Airborne Surveys
Stevens Exploration Management Corp.
Pritchard, R.A.
Burns, L.E.
Emond, A.M.
DGGS Staff
2016
Sub-regional, merged, gridded airborne geophysical data
Digital Data Series
DDS 12
Fairbanks, Alaska, United States
Alaska Division of Geological & Geophysical Surveys
1 DVD
http://doi.org/10.14509/29555
Geophysical data were acquired according to contractor, contract, and request-for-proposals specifications. For additional detail about survey parameters, see the accompanying project report available in the documents directory of this data distribution package.
Data originate from one company using the same contract specifications for all data. The originating coordinate system was retained for all publication products.
This data set includes files that contain processed aeromagnetic measurements, electromagnetic measurements, altimetry measurements, and locational data for the entire survey area.
These data are positioned with post-processed differential GPS.
These data are positioned with post-processed differential GPS.
Burns, L.E.
U.S. Bureau of Land Management
Fugro Airborne Surveys Corp.
Stevens Exploration Management Corp.
2008
Line, grid, and vector data, plot files, and descriptive project report for the airborne geophysical survey of part of the western Fortymile mining district, east-central Alaska
Geophysical Report
GPR 2008-1
Fairbanks, Alaska, United States
Alaska Division of Geological & Geophysical Surveys
9 sheets, 1 DVD
http://doi.org/10.14509/15961
paper
2008
publication date
Burns, L.E. and others, 2008
Data collection, processing, and delivery
Pritchard, R.A.
Fugro Airborne Surveys
2008
Project report of the airborne geophysical survey of part of the western Fortymile mining district, east-central Alaska
Geophysical Report
GPR 2008-1-5
Fairbanks, Alaska, United States
Alaska Division of Geological & Geophysical Surveys
60 p
http://doi.org/10.14509/24444
paper
2008
publication date
Pritchard, R.A. and Fugro Airborne Surveys, 2008
Data collection, processing, and delivery
Data collection, processing, and delivery - The airborne geophysical data were acquired under contract to Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp., Mining and Geological Consultants. The contractor's project report and other supporting documents are in the "documents" digital data package. They provide detailed documentation of the system specifications, data collection, processing, and delivery.
Alaska Division of Geological & Geophysical Surveys and others, 1994
Burns, L.E. and others, 2008
Pritchard, R.A. and Fugro Airborne Surveys, 2008
2007
Grid development - The analytic signal grid was generated by using the analytic signal function in Geosoft Oasis Montaj v9 on 100m upward continued simulated total magnetic field grid. The calculated first vertical derivative grid was created during the analytic signal process. The derivatives in the analytic signal calculation were computed using a fast Fourier transform (FFT) based 2D filter.
2019
RGB GeoTiff creation - RGB GeoTIFF raster files of gridded data were exported using Geosoft v9 by loading each Geosoft grid onto a map and using the map export tool.
2019
DXF conversion and geographic referencing - The contractor provided AutoCAD DXF files were converted to an ESRI Geodatabase in ArcMap v10 using the CAD to Geodatabase tool.
2019
Standard Boundary Polygon - The final boundary polygon was generated by loading the line data in Geosoft Oasis Montaj v9. The channel MAG was gridded using the Minimum Curvature option with the following settings: grid cell size = 25, blanking distance = 800, cells to extend beyond data = 2. The polygon file was created using the Grid Outline tool with edge resolution = 1. The polygon file was exported to ESRI shapefile.
2019
Keyhole markup language (kml) KMZ archive creation - Data were exported from Geosoft and ESRI ArcMap to kml format files and/or KMZ archives. These files were then combined and modified in Google Earth Pro to create the final KMZ file.
2019
Simulated Magnetic Total Field - In this publication's older products and documentation, the magnetic data products have been referred to as Total Field Magnetics on the maps and the MAG channel in the line data and 'mag' as a filename abbreviation. The new term 'sim_magtf' has been created to rename and clarify that the data are not representative of the true total magnetic field as the IGRF values have been removed with a single average value added back to the entire dataset, resulting in the IGRF gradient being removed. The term simulated magnetic total field and the filename abbreviation 'sim_magtf' is now used to identify these magnetic data.
2019
Data cataloged for archival and publication - All files were renamed and placed in a standardized set of folders according to the DGGS Geophysics Data Management Manual. Where applicable and as needed data were converted to newer file formats and new files were created. Supporting documentation including but not limited to readme text files, maps, figures, survey overview report, missing data type explanations, and metadata were created.
2019
Universal Transverse Mercator
7
0.999600
-141
0
500000.000000
0
coordinate pair
.00000001
.00000001
Meters
North American Datum of 1927
Clarke 1866
6378206.40000000037
294.978698199999997
ascii_data
ASCII format line data, other ASCII data
Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp.
ascii_data
databases_geosoft
Geosoft format database of line data, other Geosoft format databases
Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp.
databases_geosoft
documents
Project and field reports, survey background information, gridded data explanations, other supporting documentation
Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp. and Alaska Division of Geological & Geophysical Surveys (DGGS)
documents
grids_ermapper
Geographically registered gridded data, ER Mapper ERS format
Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp. and Alaska Division of Geological & Geophysical Surveys (DGGS)
grids_ermapper
grids_geosoft
Geosoft-format binary grids, these grids can be viewed in ESRI ArcMap using a free plugin from Geosoft or using the free viewer available from Geosoft
Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp. and Alaska Division of Geological & Geophysical Surveys (DGGS)
grids_geosoft
images_registered
GeoTiff format images of all gridded data
Alaska Division of Geological & Geophysical Surveys (DGGS)
images_registered
kmz
Keyhole markup language (kml) kmz archive files of project data. Viewable in Google Earth and other compatible programs
Alaska Division of Geological & Geophysical Surveys (DGGS)
kmz
maps_pdf_format
Printable maps in pdf format
Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp.
maps_pdf_format
maps_prn_format
Printable maps in HPGL/2 printer file format with extension .prn
Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp.
maps_prn_format
profiles_stacked
Distance-based profiles of the digitally recorded geophysical data are generated and plotted at an appropriate scale. The profiles display electromagnetic anomalies with their respective interpretive symbols
Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp.
profiles_stacked
vector_data
Line path, data contours, and survey boundary in ESRI shapefile (SHP) format, ESRI Geodatabase format, and/or AutoCAD dxf format
Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp. and Alaska Division of Geological & Geophysical Surveys (DGGS)
vector_data
video_flightpath
Survey flight path downward-facing video
Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp.
video_flightpath
Alaska Division of Geological & Geophysical Surveys
Metadata Manager
mailing and physical
3354 College Road
Fairbanks
AK
99709-3707
USA
(907)451-5020
(907)451-5050
dggspubs@alaska.gov
8 am to 4:30 pm, Monday through Friday, except State holidays
GPR 2019-7
The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.
DGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media by mail, phone, fax, or email from the DGGS Fairbanks office. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard. Turnaround time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for the exact shipping amount.
Contact DGGS for current pricing
DGGS geophysics datasets are typically compilations of multiple digital data file formats. These formats may include: GeoTiff, ESRI shapefile, Geosoft binary grid (GRD), Microsoft Office documents, PDF, ER Mapper ERS, ASCII text files (including CSV), Geosoft ASCII grid (GXF), Geosoft database, AutoCAD DXF, Geosoft plot file (PLT), Printer files (HPP, PRN, or other), digital images (multiple formats), digital video (multiple formats), Geosoft ASCII XYZ, Geosoft ASCII files (PLY, i0, EXP), and KMZ
http://doi.org/10.14509/30178
Free download
20190517
Alaska Division of Geological & Geophysical Surveys
Simone Montayne
Metadata Manager
mailing and physical
3354 College Road
Fairbanks
AK
99709-3707
USA
(907)451-5020
(907)451-5050
dggspubs@alaska.gov
8 am to 4:30 pm, Monday through Friday, except State holidays
FGDC Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998
If the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the Alaska Department of Natural Resources or Division of Geological & Geophysical Surveys.
http://www.dggs.alaska.gov/metadata/dggs.ext
dggs metadata extensions