Burns, L.E.
Geoterrex-Dighem
Stevens Exploration Management Corp.
Emond, A.M.
Graham, G.R.C.
2015
Livengood mining district electromagnetic and magnetic airborne geophysical survey, data compilation
digital data
Geophysical Report
GPR 2015-5
Fairbanks, Alaska, United States
Alaska Division of Geological & Geophysical Surveys
http://dx.doi.org/10.14509/29412
The Livengood electromagnetic and magnetic airborne geophysical survey data were acquired with a DIGHEM-V Electromagnetic (EM) system and a cesium magnetometer. The EM and magnetic sensors were flown at a height of 30 meters (m). In addition the survey recorded data from radar and laser altimeters, a GPS navigation system, 50/60 Hz monitors and a video camera. Flights were performed with an AS-350-B2 Squirrel helicopter at a mean terrain clearance of 60 m along N-S survey flight lines with a spacing of 400 m. Tie lines were flown perpendicular to the flight lines at intervals of approximately 4,800 m
The 1998 Livengood airborne electromagnetic and magnetic geophysical survey and this compilation are part of the Alaska Airborne Geophysical/Geological Mineral Inventory project funded by the Alaska State Legislature and managed by State of Alaska, Department of Natural Resources (DNR), Division of Geological & Geophysical Surveys (DGGS). The project seeks to catalyze private-sector mineral development investment. Alaska State lands that: 1) have major economic value; 2) can be developed in the short term to provide high quality jobs for Alaska; and 3) will provide economic diversification to help offset the loss of Prudhoe Bay oil revenue. This purpose for this publication is to compile and upgrade key digital data into a single publication for online data distribution.
>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
1998
2015
ground condition
as needed
-148.699814
-148.238327
65.642426
65.361259
ISO 19115 Topic Category
geoscientificInformation
Alaska Division of Geological & Geophysical Surveys
Aeromagnetic
Aeromagnetic Data
Aeromagnetic Map
Airborne Geophysical Survey
Analytic Signal
Apparent Resistivity Data
Apparent Resistivity Map
Apparent Resistivity Survey
DIGHEM-V EM System
Electromagnetic Anomalies
Electromagnetic Data
Electromagnetic Survey
First Vertical Derivative
Geophysical Map
Geophysical Survey
Geophysics
Geophysics Search Tag
Gridded Data
HEM Survey
HFEM Survey
Line Data
Magnetic Contours
Magnetic Data
Magnetic Survey
Magnetics
Raster Image
Resistivity
Alaska Division of Geological & Geophysical Surveys
Fortymile Mining District
Fortymile River
Livengood Bench
Livengood Mining District
Livengood Quadrangle
Money Knob
Shorty Creek
Tolovana Mining District
Alaska Division of Geological & Geophysical Surveys
Amy Creek Assemblage
Cascaden Ridge Unit
Livengood Dome Chert
Lost Creek Unit
Rampart Group
Victoria Creek Fault
Wickersham Unit
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
GIS Manager
mailing and physical
3354 College Road
Fairbanks
AK
99709-3707
USA
(907)451-5020
dggsgis@alaska.gov
8 am to 4:30 pm, Monday through Friday, except State holidays
Funding was provided by the Alaska State Legislature for the DGGS Airborne Geophysical/Geological Mineral Inventory (AGGMI) program.
>
>Apparent resistivity cutoffs:
>900 Hz coplanar apparent resistivity cutoff 1008 Ohm-m
>7200 Hz coplanar apparent resistivity cutoff 8250 Ohm-m
>
>Electromagnetic system sensitivity:
>Frequency; Coil Orientation; Sensitivity (ppm)
> 900 Hz horizontal coplanar 0.06
> 1000 Hz vertical coaxial 0.06
> 5500 Hz vertical coaxial 0.10
> 7200 Hz horizontal coplanar 0.10
> 56,000 Hz horizontal coplanar 0.30
>
>Magnetic system sensitivity: 0.01 nT
>
Data originate from one company using the same contract specifications for all data. The originating coordinate system was retained for all publication products except the KMZ files, which utilize WGS84 geographic coordinates. In some cases we provide values in both UTM NAD27 and geographic WGS84 projections.
Missing magnetic values occur in the databases for the survey area because of the lagging process at the beginning of some lines and due to despiking. Slow airspeed over steep terrain can cause rapid bird swing and magnetic data spikes that require removal from final data. Missing values in the calculated 'depth' occur where altimeter limits for resistivity calculation are exceeded or where magnetite causes inphase to be negative. Missing apparent resistivity values are generally caused by altitude exceeding the tolerance for meaningful resistivity calculation.
Positional accuracy of the presented data is better than 10 m with respect to the UTM grid.
Akima, H.
1970
A new method of interpolation and smooth curve fitting based on local procedures
Journal of the Association of Computing Machinery
v. 7, no. 4
New York, NY, USA
Association for Computing Machinery
paper
1970
publication date
Akima, H., 1970
total magnetic field data
Fraser, D.C.
1978
Resistivity mapping with an airborne multicoil electromagnetic system
Geophysics
v. 43
Tulsa, OK, United States
Society of Exploration Geophysicists
paper
1978
publication date
Fraser, D.C., 1978
raw and processed point data along flight lines
DGGS Staff
Geoterrex-Dighem
Stevens Exploration Management Corp.
1999
Flight lines of part of the Livengood mining district, Alaska, central Livengood Quadrangle
Public Data File
PDF 99-11
Fairbanks, Alaska, United States
Alaska Division of Geological & Geophysical Surveys
1 sheet, scale 1:63,360
http://dx.doi.org/10.14509/1894
63360
paper
1999
publication date
DGGS Staff and others, 1999
legacy data compilation
DGGS Staff
Geoterrex-Dighem
Stevens Exploration Management Corp.
1999
Total field magnetics and electromagnetic anomalies of part of the Livengood mining district, Alaska, central Livengood Quadrangle
Public Data File
PDF 99-12
Fairbanks, Alaska, United States
Alaska Division of Geological & Geophysical Surveys
1 sheet, scale 1:63,360
http://dx.doi.org/10.14509/1895
63360
paper
1999
publication date
DGGS Staff and others, 1999
legacy data compilation
DGGS Staff
Geoterrex-Dighem
Stevens Exploration Management Corp.
1999
Total field magnetics and electromagnetic anomalies of part of the Livengood mining district, Alaska, central Livengood Quadrangle (clear diazo film version)
Public Data File
PDF 99-13
Fairbanks, Alaska, United States
Alaska Division of Geological & Geophysical Surveys
1 sheet, scale 1:63,360
http://dx.doi.org/10.14509/1896
63360
paper
1999
publication date
DGGS Staff and others, 1999
legacy data compilation
DGGS Staff
Geoterrex-Dighem
Stevens Exploration Management Corp.
1999
900 Hz coplanar resistivity of part of the Livengood mining district, Alaska, central Livengood Quadrangle
Public Data File
PDF 99-14
Fairbanks, Alaska, United States
Alaska Division of Geological & Geophysical Surveys
1 sheet, scale 1:63,360
http://dx.doi.org/10.14509/1897
63360
paper
1999
publication date
DGGS Staff and others, 1999
legacy data compilation
DGGS Staff
Geoterrex-Dighem
Stevens Exploration Management Corp.
1999
7200 Hz coplanar resistivity of part of the Livengood mining district, Alaska, central Livengood Quadrangle
Public Data File
PDF 99-15
Fairbanks, Alaska, United States
Alaska Division of Geological & Geophysical Surveys
1 sheet, scale 1:63,360
http://dx.doi.org/10.14509/1898
63360
paper
1999
publication date
DGGS Staff and others, 1999
legacy data compilation
Burns, L.E.
Liss, S.A.
1999
Portfolio of aeromagnetic and resistivity maps of part of the Livengood mining district, Alaska, central Livengood Quadrangle
Public Data File
PDF 99-16
Fairbanks, Alaska, United States
Alaska Division of Geological & Geophysical Surveys
16 p
http://dx.doi.org/10.14509/1899
paper
1999
publication date
Burns, L.E. and Liss, S.A., 1999
legacy data compilation
Pritchard, R.A.
Geoterrex-Dighem
1999
Project report of the 1998 geophysical survey data for part of the Livengood mining district, Alaska, central Livengood Quadrangle
Public Data File
PDF 99-17
Fairbanks, Alaska, United States
Alaska Division of Geological & Geophysical Surveys
32 p., 1 sheet, scale 1:63,360
http://dx.doi.org/10.14509/1900
63360
paper
1999
publication date
Pritchard, R.A. and Geoterrex-Dighem, 1999
legacy data compilation
DGGS Staff
Geoterrex-Dighem
Stevens Exploration Management Corp.
1999
CD-ROM containing profile and gridded data and section lines of 1998 geophysical survey data for part of the Livengood mining district, Alaska, central Livengood Quadrangle
Public Data File
PDF 99-19
Fairbanks, Alaska, United States
Alaska Division of Geological & Geophysical Surveys
1 DVD
http://dx.doi.org/10.14509/1901
CD-ROM
1999
publication date
DGGS Staff and others, 1999
legacy data compilation
DGGS Staff
Geoterrex-Dighem
Stevens Exploration Management Corp.
1999
Total field magnetics and electromagnetic anomalies of part of the Livengood mining district, Alaska, central Livengood Quadrangle (southwestern C-3 and southeastern C-4)
Public Data File
PDF 99-20A
Fairbanks, Alaska, United States
Alaska Division of Geological & Geophysical Surveys
1 sheet, scale 1:31,680
http://dx.doi.org/10.14509/1902
31680
paper
1999
publication date
DGGS Staff and others, 1999
legacy data compilation
DGGS Staff
Geoterrex-Dighem
Stevens Exploration Management Corp.
1999
Total field magnetics and electromagnetic anomalies of part of the Livengood mining district, Alaska, central Livengood Quadrangle (northwestern B-3 and northeastern B-4)
Public Data File
PDF 99-20B
Fairbanks, Alaska, United States
Alaska Division of Geological & Geophysical Surveys
1 sheet, scale 1:31,680
http://dx.doi.org/10.14509/1903
31680
paper
1999
publication date
DGGS Staff and others, 1999
legacy data compilation
DGGS Staff
Geoterrex-Dighem
Stevens Exploration Management Corp.
1999
Total field magnetics of part of the Livengood mining district, Alaska, central Livengood Quadrangle
Report of Investigation
RI 99-4
Fairbanks, Alaska, United States
Alaska Division of Geological & Geophysical Surveys
1 sheet, scale 1:63,360
http://dx.doi.org/10.14509/2594
63360
paper
1999
publication date
DGGS Staff and others, 1999
legacy data compilation
DGGS Staff
Geoterrex-Dighem
Stevens Exploration Management Corp.
1999
900 Hz coplanar resistivity of part of the Livengood mining district, Alaska, central Livengood Quadrangle
Report of Investigation
RI 99-5
Fairbanks, Alaska, United States
Alaska Division of Geological & Geophysical Surveys
1 sheet, scale 1:63,360
http://dx.doi.org/10.14509/2595
63360
paper
1999
publication date
DGGS Staff and others, 1999
legacy data compilation
DGGS Staff
Geoterrex-Dighem
Stevens Exploration Management Corp.
1999
7200 Hz coplanar resistivity of part of the Livengood mining district, Alaska, central Livengood Quadrangle
Report of Investigation
RI 99-6
Fairbanks, Alaska, United States
Alaska Division of Geological & Geophysical Surveys
1 sheet, scale 1:63,360
http://dx.doi.org/10.14509/2596
63360
paper
1999
publication date
DGGS Staff and others, 1999
legacy data compilation
Raw and processed point data along flight lines - These data are directly provided by the contractor. Raw data are a direct export from field collection instruments. Final data are processed by method according to the contractor provided reports and process steps in this document.
Fraser, D.C., 1978
1998
Geophysical data - The geophysical data were acquired with a DIGHEM-V Electromagnetic (EM) system, a cesium magnetometer, and a Herz VLF system installed in on AS350B-2 Squirrel helicopter. In addition, the survey recorded data from a radar altimeter, GPS navigation system, 50/60 Hz monitors and video camera.
1998
Total magnetic field data - The total magnetic field data were acquired with a sampling interval of 0.1 seconds, and were (1) corrected for diurnal variations by subtraction of the digitally recorded base station magnetic data, (2) leveled to the tie line data, and (3) interpolated onto a regular 100 m grid using a modified Akima (1970) technique. The regional variation (or IGRF values, 1995, updated to September, 1998) was removed, then the average IGRF value was added back to the leveled magnetic data creating the final simulated total magnetic field data. The aeromagnetic data were interpolated onto a regular 100 m grid using a modified Akima (1970) technique.
Akima, H., 1970
1998
Inphase and quadrature components - The DIGHEM-V EM system measured inphase and quadrature components at five frequencies. EM data were sampled at 0.1 second intervals. The EM inphase and quadrature data were drift corrected using base level data collected at high altitude (areas of no signal). Along-line filters were applied to the data to remove spheric spikes. The data were inspected for variations in phase, and a phase correction was applied to the data if necessary. Resistivities were then calculated from the inphase and quadrature data for all frequencies based on a pseudo-layer half-space model. Manual leveling of the inphase and quadrature of each coil pair, based on the resistivity data and comparisons to the data from the other frequencies, was performed. Automated micro-leveling was carried out in areas of low signal. The EM system responds to bedrock conductors, conductive overburden, and cultural sources. The power line monitors and the flight track video were examined to locate cultural sources. The EM anomalies that are indicated are classified by conductance. These anomalies are described in files '*_emanomalies.csv' and '*_projectreport.pdf.'
1998
Vector data in dxf, dwg, plt, and att file formats - vector data (examples: line path, data contours) were created by exporting data and interpretations to vector format.
1998
Project report, portfolio report, and other important documents - The project report, portfolio report, and other important documents were generated by the contractor, DGGS staff, or a combination.
1998
Legacy data compilation - DGGS staff compiled and organized previously published data and the originating data from the contractor. DGGS staff converted select hpp files into PDFs to complete the PDF map collection. Original vector data were compiled into an ESRI ArcMap File Geodatabase using ArcMap 10.2.2's CAD to Geodatabase tool in batch mode. 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 'tfm' 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 IGRF value added back to the data, resulting in the IGRF gradient being removed. The term simulated magnetic total field and the filename abbreviation 'sim_magtf' is now used to identify the final magnetic data.
DGGS Staff and others, 1999
DGGS Staff and others, 1999
DGGS Staff and others, 1999
DGGS Staff and others, 1999
DGGS Staff and others, 1999
Burns, L.E. and Liss, S.A., 1999
Pritchard, R.A. and Geoterrex-Dighem, 1999
DGGS Staff and others, 1999
DGGS Staff and others, 1999
DGGS Staff and others, 1999
DGGS Staff and others, 1999
DGGS Staff and others, 1999
DGGS Staff and others, 1999
2015
Data in Geosoft GDB format - These data were created by importing the final ascii data into Geosoft Oasis Montaj v8.3 using the provided *.iO import file.
2015
Geographically registered gridded data in Geosoft GRD format - DGGS assigned missing projection info to grids as needed using Geosoft Oasis montaj v8.3. Geosoft Oaisis montaj MAGMAP extension was used to create analyic signal and calculated first vertical derivative grids.
2015
Geographically registered gridded data in GeoTiff format - These data were created by DGGS using Geosft Oasis montaj v8.3. Geosoft grd files were displayed in Geosoft and exported to GeoTiff. A matching colorbar for each grid was displayed in Geosoft and export as a GeoTiff. ER Mapper ERS files were created using Geosoft Oasis montaj v8.3 grid copy/convert function from the Geosoft format grids.
2015
Google Earth KMZ files - Created Google Earth KMZ files from the GeoTiff format gridded data using ESRI ArcMap 10.2.2.
2015
Boundary polygon - The boundary polygon was generated by loading the final line data in Geosoft Oasis montaj v8.3. The final magnetic data was gridded using the Minimum Curvature option with the following settings: grid cell size = 1/5 of line spacing, blanking distance = double the line spacing, cells to extend beyond data = 0. The polygon file was created using Grid Outline tool with edge resolution = 1. The polygon file was exported to ERSI shapefile.
2015
Universal Transverse Mercator
6
0.999600
-147
0
500000.000000
0
coordinate pair
.01
.01
Meters
North American Datum of 1927
Clarke 1866
6378206.4
294.9786982
ascii_data
ascii format final and raw data with readme files, ascii format gridded data, ascii EM anomalies
Geoterrex-Dighem and Stevens Exploration Management Corp.
ascii_data
databases_geosoft
Geosoft format database file with extension .gdb, Geosoft format import template with extension .iO for final ascii data
Geoterrex-Dighem and Stevens Exploration Management Corp.
databases_geosoft
documents
project report, portfolio summary report authored by DGGS
Alaska Division of Geological & Geophysical Surveys (DGGS), Geoterrex-Dighem, and Stevens Exploration Management Corp.
documents
grids_ermapper
geographically registered gridded data, ErMapper ERS format
Alaska Division of Geological & Geophysical Surveys (DGGS), Geoterrex-Dighem, and Stevens Exploration Management Corp.
grids_ermapper
grids_geosoft
Geosoft-format binary grids, these grids can be viewed in ESRI ArcMap using a free plugin from Geosoft. Additional explanatory information is included with the download files
Alaska Division of Geological & Geophysical Surveys (DGGS), Geoterrex-Dighem, and Stevens Exploration Management Corp.
grids_geosoft
images_registered
GeoTiff format images of all gridded data. Additional explanatory information is included with the download files
Alaska Division of Geological & Geophysical Surveys (DGGS), Geoterrex-Dighem, and Stevens Exploration Management Corp.
images_registered
kmz
Google Earth kmz files of of all gridded data
Alaska Division of Geological & Geophysical Surveys (DGGS), Geoterrex-Dighem, and Stevens Exploration Management Corp.
kmz
maps_pdf_format
print format maps in pdf format
Alaska Division of Geological & Geophysical Surveys (DGGS), Geoterrex-Dighem, and Stevens Exploration Management Corp.
maps_pdf_format
maps_prn_format
print format maps in prn (printer file) format; 2015-05-15 version note: some maps no longer display the same as the original printed maps, additional explanatory information is included with the download files
Alaska Division of Geological & Geophysical Surveys (DGGS), Geoterrex-Dighem, 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
boundary polygon in vector format; line path, interpretation, data contours, EM anomalies, map surrounds, in ESRI file geodatabase, DXF and PLT format
Alaska Division of Geological & Geophysical Surveys (DGGS), Geoterrex-Dighem, and Stevens Exploration Management Corp.
vector_data
Alaska Division of Geological & Geophysical Surveys
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
Please view our website (http://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.
GPR 2015-5
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://dx.doi.org/10.14509/29412
Free download
20150601
Alaska Division of Geological & Geophysical Surveys
Metadata Manager
mailing and physical
3354 College Road
Fairbanks
AK
99709-3707
USA
(907)451-5020
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