Identification_Information: Citation: Citation_Information: Originator: Burns, L.E. Originator: Geoterrex-Dighem Originator: Stevens Exploration Management Corp. Originator: Emond, A.M. Originator: Graham, G.R.C. Publication_Date: 2015 Title: Livengood mining district electromagnetic and magnetic airborne geophysical survey, data compilation Geospatial_Data_Presentation_Form: digital data Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2015-5 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Online_Linkage: http://dx.doi.org/10.14509/29412 Description: Abstract: 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 Purpose: 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. Supplemental_Information: >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 Time_Period_of_Content: Time_Period_Information: Multiple_Dates/Times: Single_Date/Time: Calendar_Date: 1998 Single_Date/Time: Calendar_Date: 2015 Currentness_Reference: ground condition Status: Progress: complete Maintenance_and_Update_Frequency: as needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -148.699814 East_Bounding_Coordinate: -148.238327 North_Bounding_Coordinate: 65.642426 South_Bounding_Coordinate: 65.361259 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Theme_Keyword: Aeromagnetic Theme_Keyword: Aeromagnetic Data Theme_Keyword: Aeromagnetic Map Theme_Keyword: Airborne Geophysical Survey Theme_Keyword: Analytic Signal Theme_Keyword: Apparent Resistivity Data Theme_Keyword: Apparent Resistivity Map Theme_Keyword: Apparent Resistivity Survey Theme_Keyword: DIGHEM-V EM System Theme_Keyword: Electromagnetic Anomalies Theme_Keyword: Electromagnetic Data Theme_Keyword: Electromagnetic Survey Theme_Keyword: First Vertical Derivative Theme_Keyword: Geophysical Map Theme_Keyword: Geophysical Survey Theme_Keyword: Geophysics Theme_Keyword: Geophysics Search Tag Theme_Keyword: Gridded Data Theme_Keyword: HEM Survey Theme_Keyword: HFEM Survey Theme_Keyword: Line Data Theme_Keyword: Magnetic Contours Theme_Keyword: Magnetic Data Theme_Keyword: Magnetic Survey Theme_Keyword: Magnetics Theme_Keyword: Raster Image Theme_Keyword: Resistivity Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Fortymile Mining District Place_Keyword: Fortymile River Place_Keyword: Livengood Bench Place_Keyword: Livengood Mining District Place_Keyword: Livengood Quadrangle Place_Keyword: Money Knob Place_Keyword: Shorty Creek Place_Keyword: Tolovana Mining District Stratum: Stratum_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Stratum_Keyword: Amy Creek Assemblage Stratum_Keyword: Cascaden Ridge Unit Stratum_Keyword: Livengood Dome Chert Stratum_Keyword: Lost Creek Unit Stratum_Keyword: Rampart Group Stratum_Keyword: Victoria Creek Fault Stratum_Keyword: Wickersham Unit 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. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Position: GIS Manager Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907)451-5020 Contact_Electronic_Mail_Address: dggsgis@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Data_Set_Credit: Funding was provided by the Alaska State Legislature for the DGGS Airborne Geophysical/Geological Mineral Inventory (AGGMI) program. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: > >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 > Logical_Consistency_Report: 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. Completeness_Report: 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: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Positional accuracy of the presented data is better than 10 m with respect to the UTM grid. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Akima, H. Publication_Date: 1970 Title: A new method of interpolation and smooth curve fitting based on local procedures Series_Information: Series_Name: Journal of the Association of Computing Machinery Issue_Identification: v. 7, no. 4 Publication_Information: Publication_Place: New York, NY, USA Publisher: Association for Computing Machinery Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1970 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Akima, H., 1970 Source_Contribution: total magnetic field data Source_Information: Source_Citation: Citation_Information: Originator: Fraser, D.C. Publication_Date: 1978 Title: Resistivity mapping with an airborne multicoil electromagnetic system Series_Information: Series_Name: Geophysics Issue_Identification: v. 43 Publication_Information: Publication_Place: Tulsa, OK, United States Publisher: Society of Exploration Geophysicists Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1978 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Fraser, D.C., 1978 Source_Contribution: raw and processed point data along flight lines Source_Information: Source_Citation: Citation_Information: Originator: DGGS Staff Originator: Geoterrex-Dighem Originator: Stevens Exploration Management Corp. Publication_Date: 1999 Title: Flight lines of part of the Livengood mining district, Alaska, central Livengood Quadrangle Series_Information: Series_Name: Public Data File Issue_Identification: PDF 99-11 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:63,360 Online_Linkage: http://dx.doi.org/10.14509/1894 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1999 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: DGGS Staff and others, 1999 Source_Contribution: legacy data compilation Source_Information: Source_Citation: Citation_Information: Originator: DGGS Staff Originator: Geoterrex-Dighem Originator: Stevens Exploration Management Corp. Publication_Date: 1999 Title: Total field magnetics and electromagnetic anomalies of part of the Livengood mining district, Alaska, central Livengood Quadrangle Series_Information: Series_Name: Public Data File Issue_Identification: PDF 99-12 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:63,360 Online_Linkage: http://dx.doi.org/10.14509/1895 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1999 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: DGGS Staff and others, 1999 Source_Contribution: legacy data compilation Source_Information: Source_Citation: Citation_Information: Originator: DGGS Staff Originator: Geoterrex-Dighem Originator: Stevens Exploration Management Corp. Publication_Date: 1999 Title: Total field magnetics and electromagnetic anomalies of part of the Livengood mining district, Alaska, central Livengood Quadrangle (clear diazo film version) Series_Information: Series_Name: Public Data File Issue_Identification: PDF 99-13 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:63,360 Online_Linkage: http://dx.doi.org/10.14509/1896 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1999 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: DGGS Staff and others, 1999 Source_Contribution: legacy data compilation Source_Information: Source_Citation: Citation_Information: Originator: DGGS Staff Originator: Geoterrex-Dighem Originator: Stevens Exploration Management Corp. Publication_Date: 1999 Title: 900 Hz coplanar resistivity of part of the Livengood mining district, Alaska, central Livengood Quadrangle Series_Information: Series_Name: Public Data File Issue_Identification: PDF 99-14 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:63,360 Online_Linkage: http://dx.doi.org/10.14509/1897 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1999 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: DGGS Staff and others, 1999 Source_Contribution: legacy data compilation Source_Information: Source_Citation: Citation_Information: Originator: DGGS Staff Originator: Geoterrex-Dighem Originator: Stevens Exploration Management Corp. Publication_Date: 1999 Title: 7200 Hz coplanar resistivity of part of the Livengood mining district, Alaska, central Livengood Quadrangle Series_Information: Series_Name: Public Data File Issue_Identification: PDF 99-15 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:63,360 Online_Linkage: http://dx.doi.org/10.14509/1898 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1999 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: DGGS Staff and others, 1999 Source_Contribution: legacy data compilation Source_Information: Source_Citation: Citation_Information: Originator: Burns, L.E. Originator: Liss, S.A. Publication_Date: 1999 Title: Portfolio of aeromagnetic and resistivity maps of part of the Livengood mining district, Alaska, central Livengood Quadrangle Series_Information: Series_Name: Public Data File Issue_Identification: PDF 99-16 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 16 p Online_Linkage: http://dx.doi.org/10.14509/1899 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1999 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and Liss, S.A., 1999 Source_Contribution: legacy data compilation Source_Information: Source_Citation: Citation_Information: Originator: Pritchard, R.A. Originator: Geoterrex-Dighem Publication_Date: 1999 Title: Project report of the 1998 geophysical survey data for part of the Livengood mining district, Alaska, central Livengood Quadrangle Series_Information: Series_Name: Public Data File Issue_Identification: PDF 99-17 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 32 p., 1 sheet, scale 1:63,360 Online_Linkage: http://dx.doi.org/10.14509/1900 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1999 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Pritchard, R.A. and Geoterrex-Dighem, 1999 Source_Contribution: legacy data compilation Source_Information: Source_Citation: Citation_Information: Originator: DGGS Staff Originator: Geoterrex-Dighem Originator: Stevens Exploration Management Corp. Publication_Date: 1999 Title: 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 Series_Information: Series_Name: Public Data File Issue_Identification: PDF 99-19 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 DVD Online_Linkage: http://dx.doi.org/10.14509/1901 Type_of_Source_Media: CD-ROM Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1999 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: DGGS Staff and others, 1999 Source_Contribution: legacy data compilation Source_Information: Source_Citation: Citation_Information: Originator: DGGS Staff Originator: Geoterrex-Dighem Originator: Stevens Exploration Management Corp. Publication_Date: 1999 Title: Total field magnetics and electromagnetic anomalies of part of the Livengood mining district, Alaska, central Livengood Quadrangle (southwestern C-3 and southeastern C-4) Series_Information: Series_Name: Public Data File Issue_Identification: PDF 99-20A Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:31,680 Online_Linkage: http://dx.doi.org/10.14509/1902 Source_Scale_Denominator: 31680 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1999 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: DGGS Staff and others, 1999 Source_Contribution: legacy data compilation Source_Information: Source_Citation: Citation_Information: Originator: DGGS Staff Originator: Geoterrex-Dighem Originator: Stevens Exploration Management Corp. Publication_Date: 1999 Title: Total field magnetics and electromagnetic anomalies of part of the Livengood mining district, Alaska, central Livengood Quadrangle (northwestern B-3 and northeastern B-4) Series_Information: Series_Name: Public Data File Issue_Identification: PDF 99-20B Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:31,680 Online_Linkage: http://dx.doi.org/10.14509/1903 Source_Scale_Denominator: 31680 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1999 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: DGGS Staff and others, 1999 Source_Contribution: legacy data compilation Source_Information: Source_Citation: Citation_Information: Originator: DGGS Staff Originator: Geoterrex-Dighem Originator: Stevens Exploration Management Corp. Publication_Date: 1999 Title: Total field magnetics of part of the Livengood mining district, Alaska, central Livengood Quadrangle Series_Information: Series_Name: Report of Investigation Issue_Identification: RI 99-4 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:63,360 Online_Linkage: http://dx.doi.org/10.14509/2594 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1999 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: DGGS Staff and others, 1999 Source_Contribution: legacy data compilation Source_Information: Source_Citation: Citation_Information: Originator: DGGS Staff Originator: Geoterrex-Dighem Originator: Stevens Exploration Management Corp. Publication_Date: 1999 Title: 900 Hz coplanar resistivity of part of the Livengood mining district, Alaska, central Livengood Quadrangle Series_Information: Series_Name: Report of Investigation Issue_Identification: RI 99-5 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:63,360 Online_Linkage: http://dx.doi.org/10.14509/2595 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1999 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: DGGS Staff and others, 1999 Source_Contribution: legacy data compilation Source_Information: Source_Citation: Citation_Information: Originator: DGGS Staff Originator: Geoterrex-Dighem Originator: Stevens Exploration Management Corp. Publication_Date: 1999 Title: 7200 Hz coplanar resistivity of part of the Livengood mining district, Alaska, central Livengood Quadrangle Series_Information: Series_Name: Report of Investigation Issue_Identification: RI 99-6 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:63,360 Online_Linkage: http://dx.doi.org/10.14509/2596 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1999 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: DGGS Staff and others, 1999 Source_Contribution: legacy data compilation Process_Step: Process_Description: 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. Source_Used_Citation_Abbreviation: Fraser, D.C., 1978 Process_Date: 1998 Process_Step: Process_Description: 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. Process_Date: 1998 Process_Step: Process_Description: 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. Source_Used_Citation_Abbreviation: Akima, H., 1970 Process_Date: 1998 Process_Step: Process_Description: 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.' Process_Date: 1998 Process_Step: Process_Description: 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. Process_Date: 1998 Process_Step: Process_Description: 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. Process_Date: 1998 Process_Step: Process_Description: 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. Source_Used_Citation_Abbreviation: DGGS Staff and others, 1999 Source_Used_Citation_Abbreviation: DGGS Staff and others, 1999 Source_Used_Citation_Abbreviation: DGGS Staff and others, 1999 Source_Used_Citation_Abbreviation: DGGS Staff and others, 1999 Source_Used_Citation_Abbreviation: DGGS Staff and others, 1999 Source_Used_Citation_Abbreviation: Burns, L.E. and Liss, S.A., 1999 Source_Used_Citation_Abbreviation: Pritchard, R.A. and Geoterrex-Dighem, 1999 Source_Used_Citation_Abbreviation: DGGS Staff and others, 1999 Source_Used_Citation_Abbreviation: DGGS Staff and others, 1999 Source_Used_Citation_Abbreviation: DGGS Staff and others, 1999 Source_Used_Citation_Abbreviation: DGGS Staff and others, 1999 Source_Used_Citation_Abbreviation: DGGS Staff and others, 1999 Source_Used_Citation_Abbreviation: DGGS Staff and others, 1999 Process_Date: 2015 Process_Step: Process_Description: 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. Process_Date: 2015 Process_Step: Process_Description: 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. Process_Date: 2015 Process_Step: Process_Description: 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. Process_Date: 2015 Process_Step: Process_Description: Google Earth KMZ files - Created Google Earth KMZ files from the GeoTiff format gridded data using ESRI ArcMap 10.2.2. Process_Date: 2015 Process_Step: Process_Description: 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. Process_Date: 2015 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: 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_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: .01 Ordinate_Resolution: .01 Planar_Distance_Units: Meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 294.9786982 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: ascii_data Entity_Type_Definition: ascii format final and raw data with readme files, ascii format gridded data, ascii EM anomalies Entity_Type_Definition_Source: Geoterrex-Dighem and Stevens Exploration Management Corp. Entity_Attribute_Layer_Name: ascii_data Detailed_Description: Entity_Type: Entity_Type_Label: databases_geosoft Entity_Type_Definition: Geosoft format database file with extension .gdb, Geosoft format import template with extension .iO for final ascii data Entity_Type_Definition_Source: Geoterrex-Dighem and Stevens Exploration Management Corp. Entity_Attribute_Layer_Name: databases_geosoft Detailed_Description: Entity_Type: Entity_Type_Label: documents Entity_Type_Definition: project report, portfolio summary report authored by DGGS Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS), Geoterrex-Dighem, and Stevens Exploration Management Corp. Entity_Attribute_Layer_Name: documents Detailed_Description: Entity_Type: Entity_Type_Label: grids_ermapper Entity_Type_Definition: geographically registered gridded data, ErMapper ERS format Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS), Geoterrex-Dighem, and Stevens Exploration Management Corp. Entity_Attribute_Layer_Name: grids_ermapper Detailed_Description: Entity_Type: Entity_Type_Label: grids_geosoft Entity_Type_Definition: 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 Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS), Geoterrex-Dighem, and Stevens Exploration Management Corp. Entity_Attribute_Layer_Name: grids_geosoft Detailed_Description: Entity_Type: Entity_Type_Label: images_registered Entity_Type_Definition: GeoTiff format images of all gridded data. Additional explanatory information is included with the download files Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS), Geoterrex-Dighem, and Stevens Exploration Management Corp. Entity_Attribute_Layer_Name: images_registered Detailed_Description: Entity_Type: Entity_Type_Label: kmz Entity_Type_Definition: Google Earth kmz files of of all gridded data Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS), Geoterrex-Dighem, and Stevens Exploration Management Corp. Entity_Attribute_Layer_Name: kmz Detailed_Description: Entity_Type: Entity_Type_Label: maps_pdf_format Entity_Type_Definition: print format maps in pdf format Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS), Geoterrex-Dighem, and Stevens Exploration Management Corp. Entity_Attribute_Layer_Name: maps_pdf_format Detailed_Description: Entity_Type: Entity_Type_Label: maps_prn_format Entity_Type_Definition: 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 Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS), Geoterrex-Dighem, and Stevens Exploration Management Corp. Entity_Attribute_Layer_Name: maps_prn_format Detailed_Description: Entity_Type: Entity_Type_Label: profiles_stacked Entity_Type_Definition: 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 Entity_Type_Definition_Source: Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp Entity_Attribute_Layer_Name: profiles_stacked Detailed_Description: Entity_Type: Entity_Type_Label: vector_data Entity_Type_Definition: boundary polygon in vector format; line path, interpretation, data contours, EM anomalies, map surrounds, in ESRI file geodatabase, DXF and PLT format Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS), Geoterrex-Dighem, and Stevens Exploration Management Corp. Entity_Attribute_Layer_Name: vector_data Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907)451-5020 Contact_Facsimile_Telephone: (907)451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Contact_Instructions: 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. Resource_Description: GPR 2015-5 Distribution_Liability: 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. Standard_Order_Process: Non-digital_Form: 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. Fees: Contact DGGS for current pricing Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: 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 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://dx.doi.org/10.14509/29412 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20150601 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Position: Metadata Manager Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907)451-5020 Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Use_Constraints: 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. Metadata_Extensions: Online_Linkage: http://www.dggs.alaska.gov/metadata/dggs.ext Profile_Name: dggs metadata extensions