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
Burns, L.E., Geoterrex-Dighem, Stevens Exploration Management Corp., Emond, A.M., and Graham, G.R.C., 2015, Livengood mining district electromagnetic and magnetic airborne geophysical survey, data compilation: Geophysical Report GPR 2015-5, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest .01
Ordinates (y-coordinates) are specified to the nearest .01
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 6378206.4.
The flattening of the ellipsoid used is 1/294.9786982.
Funding was provided by the Alaska State Legislature for the DGGS Airborne Geophysical/Geological Mineral Inventory (AGGMI) program.
(907)451-5020 (voice)
dggsgis@alaska.gov
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.
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, Association for Computing Machinery, New York, NY, USA.
Fraser, D.C., 1978, Resistivity mapping with an airborne multicoil electromagnetic system: Geophysics v. 43, Society of Exploration Geophysicists, Tulsa, OK, United States.
Staff, DGGS, Geoterrex-Dighem, and Stevens Exploration Management Corp., 1999, Flight lines of part of the Livengood mining district, Alaska, central Livengood Quadrangle: Public Data File PDF 99-11, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Staff, DGGS, Geoterrex-Dighem, and 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, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Staff, DGGS, Geoterrex-Dighem, and 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, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Staff, DGGS, Geoterrex-Dighem, and 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, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Staff, DGGS, Geoterrex-Dighem, and 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, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Burns, L.E., and 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, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Pritchard, R.A., and 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, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Staff, DGGS, Geoterrex-Dighem, and 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, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Staff, DGGS, Geoterrex-Dighem, and 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, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Staff, DGGS, Geoterrex-Dighem, and 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, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Staff, DGGS, Geoterrex-Dighem, and 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, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Staff, DGGS, Geoterrex-Dighem, and 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, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Staff, DGGS, Geoterrex-Dighem, and 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, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Data sources used in this process:
Data sources used in this process:
Data sources used in this process:
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
Positional accuracy of the presented data is better than 10 m with respect to the UTM grid.
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.
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.
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.
(907)451-5020 (voice)
(907)451-5050 (FAX)
dggspubs@alaska.gov
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.
| Data format: | 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 |
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| Network links: |
<http://dx.doi.org/10.14509/29412> |
(907)451-5020 (voice)