Burns, L.E.
Graham, G.R.C.
Emond, A.M.
Barefoot, J.D.
CGG
Fugro GeoServices, Inc.
2020
East Styx electromagnetic, magnetic, and radiometric airborne geophysical survey data compilation
digital data
Geophysical Report
GPR 2019-19
Fairbanks, Alaska, United States
Alaska Division of Geological & Geophysical Surveys
25 p.
http://doi.org/10.14509/30412
The East Styx electromagnetic, magnetic, and radiometric airborne geophysical survey is located about 150 kilometers northwest of Anchorage, Alaska in the upper Skwentna River drainage and surrounds the Rainy Pass Airport. The survey is in the Yentna, Redoubt, and McGrath mining districts of south-central Alaska. Frequency domain electromagnetic, magnetic, and radiometric data were collected with the DIGHEM system from June 24th to September 24th, 2013. A total of 7865.6 line kilometers were collected covering 2791.2 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/10.14509/30412.
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. Mineralization in the survey area includes the Island Mountain porphyry copper-gold deposit and the Oxide intrusion-related gold prospects, as well as other polymetallic vein and epithermal vein-type prospects.
>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
2013
2019
ground condition
None planned
-153.106038
-151.700030
62.297305
61.640936
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
Canyon Creek
Chickak River
Coal Creek
Columbia Peak
Dickason Mountain
Distin Peak
Emerald Creek
Eva Peak
Finnbear Lake
Friday Creek
Glacier Creek
Gorley Lake
Halfway Lake
Happy River
Hayes River
Hayes River Pass
Indian Creek
Johnson Creek
Kichatna River
Kohlsaat Peak
Long Lake Hills
Lookout Hill
McGrath Mining District
Moose Creek
Moose Creek Lake
Old Iditarod Trail
Old Man Creek
Porcupine Butte
Puntilla Creek
Puntilla Lake
Puntilla Mountain
Red Lake
Red Salmon Lake
Redoubt
Round Mountain
Saturday Creek
Shirley Lake
Skwentna River
Spring Creek
Totoilon Mountains
Trimble River
Yentna Mining District
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 Alaska State Legislature as part of the DGGS Airborne Geophysical/Geological Mineral Inventory (AGGMI) program and Strategic and Critical Minerals Assessment Capital Improvement (SCMA) program.
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
DGGS Staff
2016
Alaska merged geophysical data grids
Digital Data Series
DDS 12
Fairbanks, Alaska, United States
Alaska Division of Geological & Geophysical Surveys
3 p
http://doi.org/10.14509/29555
Geophysical data were acquired according to the 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. Discussion of grid resolution and factors that may impact the overall horizontal accuracy of the gridded data is available in the documents directory of this data distribution package.
Not applicable
Burns, L.E.
CGG
Fugro GeoServices, Inc.
2014
East Styx survey area: Airborne magnetic, electromagnetic and radiometric data in line (point), grid, vector, and map formats, Talkeetna, Tyonek, McGrath, and Lime Hills quadrangles, south-central Alaska
Geophysical Report
GPR 2014-5
Fairbanks, Alaska, United States
Alaska Division of Geological & Geophysical Surveys
scale 1:63,360, 1 DVD
http://doi.org/10.14509/29142
63360
paper
2014
publication date
Burns, L.E. and others, 2014
Data collection, processing, and delivery
Data collection, processing, and delivery - The airborne geophysical data were acquired under contract with CGG and Fugro Airborne Surveys Corp. 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.
Burns, L.E. and others, 2014
2013
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 MAGIGRF channel in the line data and 'magigrf' 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' are now used to identify these magnetic data.
2018
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
GeoPDF creation - Geospatial pdf file created using the Export Map function in Geosoft Oasis Montaj v9 with all maps layers visible.
2019
DXF conversion and geographic referencing - 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 rmi_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 Grid Outline tool with edge resolution = 0.2. The polygon file was exported to ESRI shapefile.
2018
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
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
5
0.999600
-153
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
CGG and Fugro GeoServices, Inc.
ascii_data
databases_geosoft
Geosoft format database of line data, other Geosoft format databases
CGG and Fugro GeoServices, Inc.
databases_geosoft
documents
Project and field reports, survey background information, gridded data explanations, other supporting documentation
CGG and Fugro GeoServices, Inc. and Alaska Division of Geological & Geophysical Surveys (DGGS)
documents
grids_ermapper
Geographically registered gridded data, ER Mapper ERS format
CGG and Fugro GeoServices, Inc. 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
CGG and Fugro GeoServices, Inc. 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
CGG and Fugro GeoServices, Inc.
maps_pdf_format
maps_prn_format
Printable maps in HPGL/2 printer file format with extension .prn
CGG and Fugro GeoServices, Inc.
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
CGG and Fugro GeoServices, Inc.
profiles_stacked
vector_data
Line path, data contours, and survey boundary in ESRI shapefile (SHP) format, ESRI Geodatabase format, and/or AutoCAD dxf format
CGG and Fugro GeoServices, Inc. and Alaska Division of Geological & Geophysical Surveys (DGGS)
vector_data
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 2019-19
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/10.14509/30412
Free download
20200203
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