Liberty Bell area, western Bonnifield mining district, electromagnetic and magnetic airborne geophysical survey, data compilation

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What does this data set describe?

Title:
Liberty Bell area, western Bonnifield mining district, electromagnetic and magnetic airborne geophysical survey, data compilation
Abstract:
This publication, GPR 2017-1, provides geophysical data produced from an airborne geophysical survey conducted in 2001 and released in 2002 for 276 sq miles of the Liberty Bell area, western Bonnifield mining district, central Alaska. Aeromagnetic and electromagnetic data were acquired during the survey. During 2016, the same digital data were reformatted for ease of use with modern processing tools; vector shapefiles and the analytic signal and calculated first vertical derivative grids were added. Other than the creation of calculated grids, no new processing was done. Data provided in GPR 2017-1 include processed (1) linedata ASCII databases, (2) gridded files of magnetic and resistivity data, (3) vector files of data contours, interpreted electromagnetic anomalies, and flight lines, (4) plot and PDF files of previously published full-color maps, and (5) proof sheet containing a reduced size version of all previously published maps for this project. Data provided include processed line data, gridded files derived from the line data, and vector files of data contours derived from the gridded files for the appropriate data systems. Interpreted electromagnetic anomalies are also included as vector files. Data are described in more detail in each folders *readme.txt files included in each folder. There is also more description in the final project report (GPR2002-9) included in the documents folder/download.
Supplemental_Information:
Project Name:  Liberty Bell
Contracting Agency:    State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS)
DGGS Section:  Mineral Resources section
Program:       Alaska Airborne Geophysical/Geological Mineral Inventory Program
Funding Source: Alaska State Legislature
Contractor:   Fugro Airborne Surveys
electromagnetic system:  DIGHEMV, a division of CGG Canada LTD.
Survey Flown By:      ERA Helicopters Ltd.
Fugro Project Number:  Fugro Project Number:    6023 (three area job - SE extension of Salcha River - Pogo, Broad Pass, Liberty Bell)
DGGS Contract Manager: Laurel E. Burns
Data Acquisition:      Digitally acquired
Line miles (km):       1257 miles (2023 km)
Data Acquisition:
Start Date (YYYY-MM-DD):       2001-08-24
End Date   (YYYY-MM-DD):       2001-08-27
Platform:      Helicopter
Platform: Model:       AS-350-B2 Squirrel
Survey Altitude Model: Mean terrain clearance (height above ground)
Nominal Helicopter Height:     60 meters
Nominal Bird Height:   30 meters
Traverse: Line Azimuth:        90 degrees / 270 degrees
Traverse: Line Spacing:        1/4 mile (400 m)
Tie: Line Azimuth:     0 degrees / 180 degrees
Tie: Line Spacing:     approximately 3 miles (approximately 4800 m)
Magnetics: Magnetometer:  Picodas MEP-710 processor with Geometrics G822 sensor optically pumped cesium sensor, towed in bird 30 M below helicopter
Electromagnetics: Sensor Model:     DIGHEM-V

Operating frequencies used for the DIGHEM-V system.

 orientation    nominal    actual
 coaxial        1000 Hz     1072 Hz
 coplanar        900 Hz      883 Hz
 coaxial        5500 Hz     5954 Hz
 coplanar       7200 Hz     7236 Hz
 coplanar     56,000 Hz   56,360 Hz

Channels recorded:
   5 in-phase channels
   5 quadrature channels
   2 monitor channels

Sensitivity:
   0.06 ppm at 1000 Hz Cx
   0.12 ppm at 900 Hz Cp
   0.12 ppm at 5,500 Hz Cx
   0.24 ppm at 7,200 Hz Cp
   0.60 ppm at 56,000 Hz Cp

Sample rate: 10 per second, equivalent to 1 sample greater than every 3 m, at a survey speed of 110 km/h.

Additional equipment: Differential Global Positioning system, magnetic base station, analog recorder, radar altimeter, digital data acquisition system, video camera, DIGHEM field workstation, and 50/60 Hz monitors

FLIGHT AND LINE NAMING

Example: L11020:29082

L = L for transverse(production) T for tie(cross)
1 = Area
1 = Line number digit 1
0 = Line number digit 2
2 = Line number digit 3
0 = Reflight number
:
2 = System number digit 1
9 = System number digit 2
0 = Flight number digit 1
8 = Flight number digit 2
2 = Flight number digit 3

Example: T15021:3089

T = T for tie(cross) L for transverse(production)
1 = Area
5 = Line number digit 1
0 = Line number digit 2
2 = Line number digit 3
1 = Reflight number:

3 = System number digit 1
0 = Flight number digit 1
8 = Flight number digit 2
9 = Flight number digit 3
  1. How should this data set be cited?

    Surveys, Fugro Airborne, Stevens Exploration Management Corp., Burns, L.E., and Graham, G.R.C., 2017, Liberty Bell area, western Bonnifield mining district, electromagnetic and magnetic airborne geophysical survey, data compilation: Geophysical Report GPR 2017-1, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -149.161346
    East_Bounding_Coordinate: -148.482612
    North_Bounding_Coordinate: 64.258160
    South_Bounding_Coordinate: 63.990150

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 2001
    Ending_Date: 2017
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

    2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 6
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -147
      Latitude_of_Projection_Origin: 0
      False_Easting: 500000.000000
      False_Northing: 0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest .00000001
      Ordinates (y-coordinates) are specified to the nearest .00000001
      Planar coordinates are specified in Meters

      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.40000000037.
      The flattening of the ellipsoid used is 1/294.978698199999997.

  7. How does the data set describe geographic features?

    ascii_data
    ASCII format final and raw data with readme files, ASCII format gridded data, Geosoft format import template with extension .iO for final ASCII data (Source: Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp.)

    databases_geosoft
    Geosoft format database file with extension .gdb (Source: Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp.)

    documents
    Final report, gridded data explanations, survey background information (Source: Alaska Division of Geological & Geophysical Surveys (DGGS), Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp.)

    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. (Source: Alaska Division of Geological & Geophysical Surveys (DGGS), Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp.)

    grids_ermapper
    Geographically registered gridded data, ErMapper ERS format (Source: Alaska Division of Geological & Geophysical Surveys (DGGS))

    images_registered
    GeoTiff format images of all gridded data. Additional explanatory information is included with the download files. (Source: Alaska Division of Geological & Geophysical Surveys (DGGS), Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp.)

    kmz
    Google Earth kmz file(s); note: these files use the WGS84 datum (Source: Alaska Division of Geological & Geophysical Surveys (DGGS), Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp.)

    maps_pdf_format
    Print format maps in PDF format (Source: Alaska Division of Geological & Geophysical Surveys (DGGS), Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp.)

    maps_prn_format
    Print format maps in HPGL/G printer file format with extension .prn. (Source: Alaska Division of Geological & Geophysical Surveys (DGGS), Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp.)

    profiles_stacked_pdf
    Electromagnetic and magnetic data profiles with EM anomalies, files in PDF format (Source: Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp.)

    profiles_stacked_prn
    Electromagnetic and magnetic data profiles with EM anomalies, files in PRN format (Source: Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp.)

    vector_data
    line path, data contours, em anomalies, interpretation and survey boundary in ESRI shape file (SHP) and Autocad (2000) DXF formats (Source: Alaska Division of Geological & Geophysical Surveys (DGGS), Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp.)


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    Funding for this survey was provided by the Alaska Division of Geological & Geophysical Surveys' (DGGS) Airborne Geophysical/Geological Mineral Inventory (AGGMI) and Strategic and Critical Minerals Assessment Capital Improvement programs and managed by State of Alaska, Department of Natural Resources (DNR), Division of Geological & Geophysical Surveys (DGGS). The survey data was collected and processed by CGG.

  3. To whom should users address questions about the data?

    Alaska Division of Geological & Geophysical Surveys
    Metadata Manager
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    (907)451-5039 (voice)
    (907)451-5050 (FAX)
    dggspubs@alaska.gov

    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays


Why was the data set created?

The 2001 Liberty Bell survey and this 2017 update 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. The project delineates mineral zones on 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. The purpose of the 2017 project was to upgrade the digital data formats and improve the map formats for the early detailed airborne geophysical surveys produced by DGGS as part of the Alaska Airborne Geophysical/Geological Mineral Inventory project and to provide these improved products to the public.


How was the data set created?

  1. From what previous works were the data drawn?

    Akima, H., 1970 (source 1 of 7)
    Akima, H., 1970, A new method of interpolation and smooth curve fitting based on local procedures: null v. 7, no. 4, Association for Computing Machinery, New York, NY, USA.

    Online Links:

    • null

    Type_of_Source_Media: paper
    Source_Contribution: Initial field processing

    Alaska Division of Geological & Geophysical Surveys and others, 2002 (source 2 of 7)
    Alaska Division of Geological & Geophysical Surveys, Surveys, Fugro Airborne, Stevens Exploration Management Corp., and Burns, L.E., 2002, Grid and vector data of airborne geophysical survey data for the Liberty Bell area, western Bonnifield mining district, central Alaska: Geophysical Report GPR 2002-8, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Type_of_Source_Media: paper
    Source_Contribution: Legacy data compilation

    Alaska Division of Geological & Geophysical Surveys and others, 2002 (source 3 of 7)
    Alaska Division of Geological & Geophysical Surveys, Surveys, Fugro Airborne, Stevens Exploration Management Corp., and Burns, L.E., 2002, Line, grid, and vector data of airborne geophysical survey data for the Liberty Bell area, western Bonnifield mining district, central Alaska: Geophysical Report GPR 2002-7, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 DVD
    Type_of_Source_Media: paper
    Source_Contribution: Legacy data compilation

    Alaska Division of Geological & Geophysical Surveys and others, 2002 (source 4 of 7)
    Alaska Division of Geological & Geophysical Surveys, Surveys, Fugro Airborne, Stevens Exploration Management Corp., and Burns, L.E., 2002, Plot files of the airborne geophysical survey data of the Liberty Bell area, western Bonnifield mining district, central Alaska: Geophysical Report GPR 2002-6, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 DVD
    Type_of_Source_Media: paper
    Source_Contribution: Legacy data compilation

    Burns, L.E., 2002 (source 5 of 7)
    Burns, L.E., 2002, Portfolio of aeromagnetic and resistivity maps of the Liberty Bell area, western Bonnifield mining district, central Alaska: Geophysical Report GPR 2002-10, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 14 p
    Type_of_Source_Media: paper
    Source_Contribution: Legacy data compilation

    Fraser, D.C., 1978 (source 6 of 7)
    Fraser, D.C., 1978, Resistivity mapping with an airborne multicoil electromagnetic system: Geophysics v. 43, Society of Exploration Geophysicists, Tulsa, OK, United States.

    Online Links:

    • null

    Type_of_Source_Media: paper
    Source_Contribution: Inphase and quadrature components

    Pritchard, R.A. and Fugro Airborne Surveys, 2002 (source 7 of 7)
    Pritchard, R.A., and Surveys, Fugro Airborne, 2002, Project report of the airborne geophysical survey of the Liberty Bell area, western Bonnifield mining district, central Alaska: Geophysical Report GPR 2002-9, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 172 p., 1 sheet, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Legacy data compilation

  2. How were the data generated, processed, and modified?

    Date: 2001 (process 1 of 11)
    Initial field specifications - The airborne geophysical data were acquired with a DIGHEM(V) Electromagnetic (EM) system and a Scintrex cesium magnetometer. Both were flown at a height of 100 feet. In addition, the survey recorded data from a radar altimeter, GPS navigation system, 50/60 Hz monitors and video camera. Flights were performed with an AS350B-2 Squirrel helicopter at a mean terrain clearance of 200 feet along north-south survey flight lines with a spacing of one quarter mile. Tie lines were flown perpendicular to the flight lines at intervals of approximately 3 miles. An Ashtech GG24 NAVSTAR/GLONASS Global Positioning System was used for navigation. The helicopter position was derived every 0.5 seconds using post-flight differential positioning to a relative accuracy of better than 5 m. Flight path positions were projected onto the Clarke 1866 (UTM zone 6) spheroid, 1927 North American datum using a central meridian (CM) of 147 degrees, a north constant of 0 and an east constant of 500,000.

    Date: 2001 (process 2 of 11)
    Initial field processing - 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 gradient, 2000, updated to August 2001) was removed from the leveled magnetic data. The aeromagnetic data were interpolated onto a regular 100 m grid using a modified Akima (1970) technique.The EM inphase and quadrature data are drift corrected using base level data collected at high altitude (areas of no signal). Along-line filters are applied to the data to remove spheric spikes. The data are inspected for variations in phase, and a phase correction is applied to the data if necessary. Resistivities are 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, is performed. Automated micro-leveling is carried out in areas of low signal. The resistivity data were then interpolated onto a regular 100 m grid using a modified Akima (1970) technique. The resulting grids are subjected to a 3x3 hanning filter before contouring and map production.

    Data sources used in this process:

    • Akima, H., 1970

    Date: 2002 (process 3 of 11)
    Inphase and quadrature components - To determine the location of electromagnetic (EM) anomalies or their boundaries, the DIGHEM(V) EM system measured inphase and quadrature components at five frequencies. Two vertical coaxial-coil pairs operated at 1000 and 5500 and three coplanar-coil pairs operated at 900, 7200, and 56,000 Hz. EM data were sampled at 0.1 second intervals. The EM data were interpolated onto a regular 100 m grid using a modified Akima (1970) technique. The EM system responds to bedrock conductors, conductive overburden, and cultural sources. The power line monitor and the flight track video were examined to locate cultural sources. The EM anomalies that are indicated are classified by conductance.

    Data sources used in this process:

    • Fraser, D.C., 1978

    Date: 2002 (process 4 of 11)
    DTM creation - To produce the digital terrain model, the GPS-Z data are differentially corrected and transformed into the local datum. Both the Z-COR (differentially corrected GPS-Z) and the radar altimeter values (aircraft to ground clearance) are checked for spikes, which are removed manually. The corrected altimeter is then subtracted from the Z-COR data to produce profiles of the height above mean sea level along the survey lines. The data is micro-leveled to remove any errors between lines. The leveled data is then filtered along line with 29 pt. median and hanning filters.

    Date: 2016 (process 5 of 11)
    Legacy data compilation - DGGS staff compiled and organized previously published data and the originating data from the contractor. Original vector data were converted into ESRI shapefiles using ArcMap 10.3.1's Export to Shapefile tool. 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 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.

    Data sources used in this process:

    • Alaska Division of Geological & Geophysical Surveys and others, 2002
    • Alaska Division of Geological & Geophysical Surveys and others, 2002
    • Alaska Division of Geological & Geophysical Surveys and others, 2002
    • Burns, L.E., 2002
    • Pritchard, R.A. and Fugro Airborne Surveys, 2002

    Date: 2016 (process 6 of 11)
    Data in Geosoft GDB format - These data were created by importing the final ASCII data into Geosoft Oasis montaj v8.5.1 using the created *.iO import file.

    Date: 2016 (process 7 of 11)
    Geographically registered gridded data in GeoTiff format - These data were created by DGGS using Geosoft Oasis montaj v8.5.1. Geosoft GRD files were displayed in Geosoft and exported to GeoTiff. A matching color-bar for each grid was displayed in Geosoft and export as a GeoTiff.

    Date: 2016 (process 8 of 11)
    Geographically registered gridded data in Geosoft GRD format - DGGS assigned missing projection info to grids as needed using Geosoft Oasis montaj v8.3. Geosoft Oasis montaj MAGMAP extension was used to create analytic signal grid.

    Date: 2016 (process 9 of 11)
    Google Earth KMZ files - Created Google Earth KMZ files from the GeoTiff format gridded data using ESRI ArcGIS 10.3.1.

    Date: 2016 (process 10 of 11)
    Boundary polygon - The boundary polygon was generated by loading the final line data in Geosoft Oasis montaj v8.5.1. 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 ESRI shapefile.

    Date: 2017 (process 11 of 11)
    ErMapper ERS files - Created ErMapper ERS files from grids using Geosoft grid utility, Copy/Convert. Using the ErMapper (*.ers) convert option, transfers the grid value to the .ers format file. The .ers format data created from GeoSoft 9.1.

  3. What similar or related data should the user be aware of?

    Athey, J.E., Newberry, R.J., Werdon, M.B., Freeman, L.K., Smith, R.L., and Szumigala, D.J., 2006, Bedrock geologic map of the Liberty Bell area, Fairbanks A-4 Quadrangle, Bonnifield mining district, Alaska: Report of Investigation RI 2006-2 v. 1.0.1, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 98 p., 1 sheet, scale 1:50,000
    Burns, L.E., Fugro Airborne Surveys Corp., Stevens Exploration Management Corp., Graham, G.R.C., and Emond, A.M., 2016, Bonnifield mining district electromagnetic and magnetic airborne geophysical survey, data compilation: Geophysical Report GPR 2016-1, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    Geophysical data were acquired during an airborne survey. The magnetometer used had a sensitivity of 0.01 nT. Resistivity sensitivity varies among the different frequencies from 0.06 ppm to .60 ppm. For additional detail about survey parameters, see the accompanying project report. The report was originally released as DGGS GPR 2002-9 and is available in the documents directory of this data distribution package.

  2. How accurate are the geographic locations?

    The helicopter position was derived every 0.5 seconds using post-flight differential positioning to a relative accuracy of better than 10 m. Positional accuracy of the presented data is better than 5 m with respect to the UTM grid. Further inaccuracies may have been introduced by the interpolation and gridding process.

  3. How accurate are the heights or depths?

    The helicopter position was derived every 0.5 seconds using post-flight differential positioning to a relative accuracy of better than 10 m. Positional accuracy of the presented data is better than 5 m with respect to the UTM grid. Further inaccuracies may have been introduced by the interpolation and gridding process.

  4. Where are the gaps in the data? What is missing?

    This publication release provides the entire dataset generated by this project.

  5. How consistent are the relationships among the observations, including topology?

    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.


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
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).
Use_Constraints:
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.

  1. Who distributes the data set? (Distributor 1 of 1)

    Alaska Division of Geological & Geophysical Surveys
    Metadata Manager
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    (907)451-5039 (voice)
    (907)451-5050 (FAX)
    dggspubs@alaska.gov

    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
  2. What's the catalog number I need to order this data set?

    GPR 2017-1

  3. What legal disclaimers am I supposed to read?

    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.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 07-Mar-2017
Metadata author:
Alaska Division of Geological & Geophysical Surveys
Metadata Manager
3354 College Road
Fairbanks, AK 99709-3707
USA

(907)451-5039 (voice)
(907)451-5050 (FAX)
dggspubs@alaska.gov

Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:


Generated by mp version 2.9.21 on Tue Mar 7 12:40:48 2017