6e1a87b3-90df-4327-bf0b-cbb7f774bf26_source eng; USA utf8 dataset Simone Montayne Alaska Division of Geological & Geophysical Surveys Metadata Manager (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 pointOfContact 2019-03-27 ISO 19115 Geographic Information - Metadata ISO 19115:2003/Cor.1:2006(E) Circle electromagnetic and magnetic airborne geophysical survey data compilation 2019-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Burns, L.E. originator Barefoot, J.D. originator Woods, Rebecca-Ellen originator WGM Mining and Geological Consultants, Inc. originator Dighem Surveys and Processing originator http://doi.org/10.14509/30167 DIGITAL DATA Geophysical Report GPR 2019-3 4 p. This geophysical survey is located in north-central Alaska in the Circle mining district, about 120 kilometers northeast of Fairbanks, Alaska. Frequency domain electromagnetic and magnetic data were collected with the DIGHEM system from August to September 1993. A total of 2516.7 line kilometers were collected covering 921.5 square kilometers. Line spacing was 400 meters (m). Data were collected 30 m above the ground surface from a helicopter towed sensor platform ("bird") on a 30 m long line. The data, as well as additional metadata, are available from the DGGS website: http://doi.org/10.14509/30167. This airborne geophysical survey is part of a program to acquire data on Alaska's most promising mineral belts and districts. The information acquired is aimed at catalyzing new private sector exploration, discovery, and ultimate development and production. The purpose of the survey was to map the magnetic and conductive properties of the survey area. The Circle Mining District has historically been a placer district, and these surveys are aimed at locating possible bedrock sources. Mineral prospects in the survey area include Top Dollar and 88 Group. Other gold and base-metal anomalies, altered zones, favorable lithologies, and structural zones are known to exist throughout the survey area. Funding was provided by the Alaska State Legislature as part of the DGGS Airborne Geophysical/Geological Mineral Inventory (AGGMI) program. completed Alaska Division of Geological & Geophysical Surveys Metadata Manager (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 pointOfContact notPlanned Aeromagnetic Aeromagnetic Data Aeromagnetic Map Aeromagnetic Survey Airborne Geophysical Survey Analytic Signal Apparent Resistivity Data Apparent Resistivity Map Apparent Resistivity Survey Conductivity Survey Electromagnetic Data Electromagnetic Survey Exploration First Vertical Derivative Frequency Domain Electromagnetic Data Geologic Geology Geophysical Map Geophysical Survey Geophysics Geophysics Search Tag Gridded Data Line Data Magnetic Data Magnetic Survey Magnetics Mastodon Remote Sensing Resistivity Resistivity Survey theme Alaska Division of Geological & Geophysical Surveys Bates Creek Bedrock Creek Birch Creek Bonanza Creek Bottom Dollar Creek Boulder Creek Butte Creek Circle Hot Springs Cripple Creek Crooked Creek Deadwood Deadwood Creek Dome Creek Eagle Creek Eagle Summit Easley Creek Fish Creek Gold Dust Creek Graveyard Creek Greenhorn Creek Half Dollar Creek Harrison Creek Harrison Fork Holdem Creek Hot Springs Creek Independence Creek Ketchem Creek Ketchem Dome Mammoth Creek Mary Louise Fork Mastodon Creek Mastodon Dome Mastodon Fork Mastodon Fork Eagle Creek Miller Creek Miller Fork Miller Fork Eagle Creek Miller House North Fork Harrison Creek Pinnell Trail Porcupine Creek Porcupine Dome Portage Creek Ptarmigan Creek Sawpit Creek Slate Creek South Fork Harrison Creek Squaw Creek Switch Creek Traverse Creek Two-Bit Creek Yankee Creek place 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). Airborne GeophysWeb: A compilation of geophysical data from DGGS and cooperating agencies 2014-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher DGGS Staff originator http://doi.org/10.14509/27222 Digital Data Series DDS 2 crossReference Alaska merged geophysical data grids 2016-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher DGGS Staff originator http://doi.org/10.14509/29555 Digital Data Series DDS 12 1 DVD crossReference eng; USA geoscientificInformation -145.591778 -144.517385 65.365742 65.590254 1993-01-01 >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 >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 >video_flightpath: Survey flight path downward-facing video 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 Metadata Manager (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 distributor Contact DGGS for current pricing Free download http://doi.org/10.14509/30167 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 These data are positioned with post-processed differential GPS. Vertical Positional Accuracy Report These data are positioned with post-processed differential GPS. This data set includes files that contain processed aeromagnetic measurements, electromagnetic measurements, altimetry measurements, and locational data for the entire survey area. This data set includes files that contain processed aeromagnetic measurements, electromagnetic measurements, altimetry measurements, and locational data for the entire survey area. Data originate from one company using the same contract specifications for all data. The originating coordinate system was retained for all publication products. This lineage was generated by the FGDC CSDGM to 19139 transformation Data collection, processing, and delivery - Data collection, processing, and delivery - The airborne geophysical data were acquired under a contract with WGM Mining and Geological Consultants, Inc. and Dighem Surveys and Processing. The contractor's project report and other supporting documents are in the "documents" digital data package. They provide detailed documentation of the system specifications, data collection, processing, and delivery. 1993-01-01T00:00:00 Reformatting - Digital data collected in 1993 were reformatted by Fugro Airborne Surveys Corp. for ease of use with modern processing tools, vector files were added, and new color maps were produced. No reprocessing was done. 2004-01-01T00:00:00 Grid development - MAG, RES900, RES7200, and RES56K grids delivered by the contractor were mislocated geographically. These grids were re-generated by loading line data in Geosoft Oasis Montaj v9. Channels MAG, RES900, RES7200, and RES56K were gridded using the Minimum Curvature option with the following settings: grid cell size = 80, blanking distance = 800, cells to extend beyond data = 1. The newly generated sim_magtf grid is not the same as the grid on circle_sim_magtf_topo_map.pdf. The grid on the pdf maps has a third order trend removed. 2019-01-01T00:00:00 Analytic signal grid - The analytic signal grid was generated by using the analytic signal function in Geosoft Oasis Montaj v9 on 100m upward continued simulated total magnetic field grid. The calculated first vertical derivative grid was created during the analytic signal process. The derivatives in the analytic signal calculation were computed using a fast Fourier transform (FFT) based 2D filter. 2019-01-01T00:00:00 RGB GeoTiff creation - RGB GeoTIFF raster files of gridded data were exported using Geosoft v9 by loading each Geosoft grid onto a map and using the map export tool. 2019-01-01T00:00:00 DXF conversion and geographic referencing - Contractor provided AutoCAD DXF files were converted to an ESRI Geodatabase in ArcMap v10 using the CAD to Geodatabase tool. 2019-01-01T00:00:00 Standard Boundary Polygon - The final boundary polygon was generated by loading the line data in Geosoft Oasis Montaj v9. The channel MAG was gridded using the Minimum Curvature option with the following settings: grid cell size = 25, blanking distance = 800, cells to extend beyond data = 2. The polygon file was created using Grid Outline tool with edge resolution = 1. The polygon file was exported to ESRI shapefile. 2019-01-01T00:00:00 Keyhole markup language (kml) KMZ archive creation - Data were exported from Geosoft and ESRI ArcMap to kml format files and/or KMZ archives. These files were then combined and modified in Google Earth Pro to create the final KMZ file. 2019-01-01T00:00:00 Simulated Magnetic Total Field - 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 MAG channel in the line data and 'mag' 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 value added back to the entire dataset, resulting in the IGRF gradient being removed. The term simulated magnetic total field and the filename abbreviation 'sim_magtf' is now used to identify these magnetic data. 2019-01-01T00:00:00 Data cataloged for archival and publication - All files were renamed and placed in a standardized set of folders according to the DGGS Geophysics Data Management Manual. Where applicable and as needed data were converted to newer file formats and new files were created. Supporting documentation including but not limited to readme text files, maps, figures, survey overview report, missing data type explanations, and metadata were created. 2019-01-01T00:00:00 Source Contribution: Data collection, processing, and deliverySource Type: paper 63360 7200 Hz resistivity contours of Circle mining district 1994-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Alaska Division of Geological & Geophysical Surveys originator WGM, Inc. originator Dighem originator http://doi.org/10.14509/1637 Public Data File PDF 94-12 1 sheet, scale 1:63,360 1994-01-01 Source Contribution: Data collection, processing, and deliverySource Type: paper 63360 900 Hz resistivity contours of Circle mining district 1994-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Alaska Division of Geological & Geophysical Surveys originator WGM, Inc. originator Dighem originator http://doi.org/10.14509/1636 Public Data File PDF 94-11 1 sheet, scale 1:63,360 1994-01-01 Source Contribution: Data collection, processing, and deliverySource Type: paper 63360 Clear mylar version of RI 94-2: Total field magnetics and electromagnetic anomalies of the Circle mining district 1994-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Alaska Division of Geological & Geophysical Surveys originator WGM, Inc. originator Dighem originator http://doi.org/10.14509/1639 Public Data File PDF 94-14 1 sheet, scale 1:63,360 1994-01-01 Source Contribution: Data collection, processing, and deliverySource Type: paper 63360 Flight lines of Circle mining district 1994-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Alaska Division of Geological & Geophysical Surveys originator WGM, Inc. originator Dighem originator http://doi.org/10.14509/1635 Public Data File PDF 94-10 1 sheet, scale 1:63,360 1994-01-01 Source Contribution: Data collection, processing, and deliverySource Type: paper 63360 Filtered total field VLF contours of Circle mining district 1994-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Alaska Division of Geological & Geophysical Surveys originator WGM, Inc. originator http://doi.org/10.14509/1638 Public Data File PDF 94-13 1 sheet, scale 1:63,360 1994-01-01 Source Contribution: Data collection, processing, and deliverySource Type: paper Line, gridded, and vector data, and selected plot files of the airborne geophysical survey data of the Circle mining district, central Alaska 2004-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Burns, L.E. originator Fugro Airborne Surveys Corp. originator Stevens Exploration Management Corp. originator http://doi.org/10.14509/3339 Geophysical Report GPR 2004-5 1 DVD 2004-01-01 Source Contribution: Data collection, processing, and deliverySource Type: paper CD-ROM digital archive files of 1993 survey data for Nome, Circle, Nyac, and Valdez Creek mining districts 1994-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher DGGS Staff originator Dighem originator WGM, Inc. originator http://doi.org/10.14509/1640 Public Data File PDF 94-15 22 p., 1 DVD 1994-01-01 Source Contribution: Data collection, processing, and deliverySource Type: paper 63360 7200 Hz coplanar resistivity of the Circle mining district 1994-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher DGGS Staff originator WGM, Inc. originator Dighem originator http://doi.org/10.14509/2502 Report of Investigation RI 94-16 1 sheet, scale 1:63,360 1994-01-01 Source Contribution: Data collection, processing, and deliverySource Type: paper 63360 900 Hz coplanar resistivity of the Circle mining district 1994-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher DGGS Staff originator WGM, Inc. originator Dighem originator http://doi.org/10.14509/2503 Report of Investigation RI 94-17 1 sheet, scale 1:63,360 1994-01-01 Source Contribution: Data collection, processing, and deliverySource Type: paper 63360 Color shadow total field magnetics of the Circle mining district 1994-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher DGGS Staff originator WGM, Inc. originator Dighem originator http://doi.org/10.14509/2501 Report of Investigation RI 94-15 1 sheet, scale 1:63,360 1994-01-01 Source Contribution: Data collection, processing, and deliverySource Type: paper Digital gridded data of total field magnetics and electromagnetics for entire survey of Circle mining district 1994-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher DGGS Staff originator WGM, Inc. originator Dighem originator http://doi.org/10.14509/1659 Public Data File PDF 94-33 1 DVD 1994-01-01 Source Contribution: Data collection, processing, and deliverySource Type: paper 63360 Total field magnetics and electromagnetic anomalies of the Circle mining district 1994-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher DGGS Staff originator WGM, Inc. originator Dighem originator http://doi.org/10.14509/2488 Report of Investigation RI 94-2 1 sheet, scale 1:63,360 1994-01-01 Source Contribution: Data collection, processing, and deliverySource Type: paper 63360 Total field magnetics of the Circle mining district 1994-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher DGGS Staff originator WGM, Inc. originator Dighem originator http://doi.org/10.14509/2500 Report of Investigation RI 94-14 1 sheet, scale 1:63,360 1994-01-01 Source Contribution: Data collection, processing, and deliverySource Type: paper 63360 Final summary of 1993 airborne geophysical surveys of the Nome, Circle, Nyac, and Valdez Creek areas 1994-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher McConnell, D.L. originator http://doi.org/10.14509/1662 Public Data File PDF 94-36 327 p., 4 sheets, scale 1:63,360 1994-01-01 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. Simone Montayne Alaska Division of Geological & Geophysical Surveys Metadata Manager (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 pointOfContact