b4269e03-c08f-4bc9-a9e1-7351ddfddd5c_source eng; USA utf8 dataset Alaska Division of Geological & Geophysical Surveys Metadata Manager (907)451-5020 3354 College Road Fairbanks AK 99709-3707 USA pointOfContact 2015-06-01 ISO 19115 Geographic Information - Metadata ISO 19115:2003/Cor.1:2006(E) Livengood mining district electromagnetic and magnetic airborne geophysical survey, data compilation 2015-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Burns, L.E. originator Geoterrex-Dighem originator Stevens Exploration Management Corp. originator Emond, A.M. originator Graham, G.R.C. originator http://dx.doi.org/10.14509/29412 DIGITAL DATA Geophysical Report GPR 2015-5 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. Funding was provided by the Alaska State Legislature for the DGGS Airborne Geophysical/Geological Mineral Inventory (AGGMI) program. completed Alaska Division of Geological & Geophysical Surveys GIS Manager (907)451-5020 3354 College Road Fairbanks AK 99709-3707 USA dggsgis@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays pointOfContact asNeeded 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 theme 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 place 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 stratum Alaska Division of Geological & Geophysical Surveys 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. otherRestrictions 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. otherRestrictions 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). eng; USA geoscientificInformation -148.699814 -148.238327 65.361259 65.642426 1998-01-01 2015-01-01 >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 true 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 unknown Alaska Division of Geological & Geophysical Surveys (907)451-5020 (907)451-5050 3354 College Road Fairbanks AK 99709-3707 USA 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. distributor Contact DGGS for current pricing Free download http://dx.doi.org/10.14509/29412 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 CSDGM IMPORT ERROR: No digtinfo/formcont information dataset Horizontal Positional Accuracy Report 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. 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. This lineage was generated by the FGDC CSDGM to 19139 transformation 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. 1998-01-01T00:00:00 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. 1998-01-01T00:00:00 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. 1998-01-01T00:00:00 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.' 1998-01-01T00:00:00 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. 1998-01-01T00:00:00 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. 1998-01-01T00:00:00 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. 2015-01-01T00:00:00 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. 2015-01-01T00:00:00 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. 2015-01-01T00:00:00 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. 2015-01-01T00:00:00 Google Earth KMZ files - Created Google Earth KMZ files from the GeoTiff format gridded data using ESRI ArcMap 10.2.2. 2015-01-01T00:00:00 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. 2015-01-01T00:00:00 Source Contribution: total magnetic field dataSource Type: paper A new method of interpolation and smooth curve fitting based on local procedures 1970-01-01 publication Association for Computing Machinery New York NY, USA publisher Akima, H. originator Journal of the Association of Computing Machinery v. 7, no. 4 1970-01-01 Source Contribution: raw and processed point data along flight linesSource Type: paper Resistivity mapping with an airborne multicoil electromagnetic system 1978-01-01 publication Society of Exploration Geophysicists Tulsa OK, United States publisher Fraser, D.C. originator Geophysics v. 43 1978-01-01 Source Contribution: legacy data compilationSource Type: paper 63360 Flight lines of part of the Livengood mining district, Alaska, central Livengood Quadrangle 1999-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher DGGS Staff originator Geoterrex-Dighem originator Stevens Exploration Management Corp. originator http://dx.doi.org/10.14509/1894 Public Data File PDF 99-11 1 sheet, scale 1:63,360 1999-01-01 Source Contribution: legacy data compilationSource Type: paper 63360 Total field magnetics and electromagnetic anomalies of part of the Livengood mining district, Alaska, central Livengood Quadrangle 1999-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher DGGS Staff originator Geoterrex-Dighem originator Stevens Exploration Management Corp. originator http://dx.doi.org/10.14509/1895 Public Data File PDF 99-12 1 sheet, scale 1:63,360 1999-01-01 Source Contribution: legacy data compilationSource Type: paper 63360 Total field magnetics and electromagnetic anomalies of part of the Livengood mining district, Alaska, central Livengood Quadrangle (clear diazo film version) 1999-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher DGGS Staff originator Geoterrex-Dighem originator Stevens Exploration Management Corp. originator http://dx.doi.org/10.14509/1896 Public Data File PDF 99-13 1 sheet, scale 1:63,360 1999-01-01 Source Contribution: legacy data compilationSource Type: paper 63360 900 Hz coplanar resistivity of part of the Livengood mining district, Alaska, central Livengood Quadrangle 1999-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher DGGS Staff originator Geoterrex-Dighem originator Stevens Exploration Management Corp. originator http://dx.doi.org/10.14509/1897 Public Data File PDF 99-14 1 sheet, scale 1:63,360 1999-01-01 Source Contribution: legacy data compilationSource Type: paper 63360 7200 Hz coplanar resistivity of part of the Livengood mining district, Alaska, central Livengood Quadrangle 1999-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher DGGS Staff originator Geoterrex-Dighem originator Stevens Exploration Management Corp. originator http://dx.doi.org/10.14509/1898 Public Data File PDF 99-15 1 sheet, scale 1:63,360 1999-01-01 Source Contribution: legacy data compilationSource Type: paper Portfolio of aeromagnetic and resistivity maps of part of the Livengood mining district, Alaska, central Livengood Quadrangle 1999-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Burns, L.E. originator Liss, S.A. originator http://dx.doi.org/10.14509/1899 Public Data File PDF 99-16 16 p 1999-01-01 Source Contribution: legacy data compilationSource Type: paper 63360 Project report of the 1998 geophysical survey data for part of the Livengood mining district, Alaska, central Livengood Quadrangle 1999-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Pritchard, R.A. originator Geoterrex-Dighem originator http://dx.doi.org/10.14509/1900 Public Data File PDF 99-17 32 p., 1 sheet, scale 1:63,360 1999-01-01 Source Contribution: legacy data compilationSource Type: CD-ROM 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 1999-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher DGGS Staff originator Geoterrex-Dighem originator Stevens Exploration Management Corp. originator http://dx.doi.org/10.14509/1901 Public Data File PDF 99-19 1 DVD 1999-01-01 Source Contribution: legacy data compilationSource Type: paper 31680 Total field magnetics and electromagnetic anomalies of part of the Livengood mining district, Alaska, central Livengood Quadrangle (southwestern C-3 and southeastern C-4) 1999-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher DGGS Staff originator Geoterrex-Dighem originator Stevens Exploration Management Corp. originator http://dx.doi.org/10.14509/1902 Public Data File PDF 99-20A 1 sheet, scale 1:31,680 1999-01-01 Source Contribution: legacy data compilationSource Type: paper 31680 Total field magnetics and electromagnetic anomalies of part of the Livengood mining district, Alaska, central Livengood Quadrangle (northwestern B-3 and northeastern B-4) 1999-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher DGGS Staff originator Geoterrex-Dighem originator Stevens Exploration Management Corp. originator http://dx.doi.org/10.14509/1903 Public Data File PDF 99-20B 1 sheet, scale 1:31,680 1999-01-01 Source Contribution: legacy data compilationSource Type: paper 63360 Total field magnetics of part of the Livengood mining district, Alaska, central Livengood Quadrangle 1999-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher DGGS Staff originator Geoterrex-Dighem originator Stevens Exploration Management Corp. originator http://dx.doi.org/10.14509/2594 Report of Investigation RI 99-4 1 sheet, scale 1:63,360 1999-01-01 Source Contribution: legacy data compilationSource Type: paper 63360 900 Hz coplanar resistivity of part of the Livengood mining district, Alaska, central Livengood Quadrangle 1999-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher DGGS Staff originator Geoterrex-Dighem originator Stevens Exploration Management Corp. originator http://dx.doi.org/10.14509/2595 Report of Investigation RI 99-5 1 sheet, scale 1:63,360 1999-01-01 Source Contribution: legacy data compilationSource Type: paper 63360 7200 Hz coplanar resistivity of part of the Livengood mining district, Alaska, central Livengood Quadrangle 1999-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher DGGS Staff originator Geoterrex-Dighem originator Stevens Exploration Management Corp. originator http://dx.doi.org/10.14509/2596 Report of Investigation RI 99-6 1 sheet, scale 1:63,360 1999-01-01 otherRestrictions 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. unknown This metadata was automatically generated from the FGDC Content Standard for Digital Geospatial Metadata standard (version FGDC-STD-001-1998) using the 2019-08-12T11:11:00 version of the FGDC CSDGM to ISO 19139 transform. Alaska Division of Geological & Geophysical Surveys Metadata Manager (907)451-5020 3354 College Road Fairbanks AK 99709-3707 USA pointOfContact