CGG Fugro GeoServices, Inc. 2015 raster digital data, tabular digital data, and vector digital data Geophysical Report GPR 2014-3 Fairbanks, AK, USA State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS) 126 sheets, 1 DVD, scale 1:31,680. http://dx.doi.org/10.14509/27326 http://dggs.alaska.gov/pubs/gpdata/236 This digital publication, GPR 2014-3, contains CGG's analysis and interpretation of data produced from airborne geophysical surveys published by DGGS in 2013 (GPR 2013-1) for the Southern Dishna River, Fox Hills, and Beaver Creek survey areas. These three survey areas are informally referred to as the Five Spot survey in places in this publication. CGG's frequency-domain DIGHEM V system was used for the EM data. GPR 2014-3 includes (1) CGG's project report with interpretation and detailed EM Anomalies, and (2) Multi-channel stacked profiles in pdf format. Interpretation maps and EM anomalies are provided in various formats (e.g., Geotiffs, KMZs, and others) and are listed in detail in GPR2014-003 ReadMe (.txt and .pdf). Supporting files include GPR2014_003_ReadMe.txt, gpr2014_003_browsegraphic.pdf, and individual pdfs of some of the items in the browsegraphic file. The survey was part of the Alaska Airborne Geophysical/Geological Mineral Inventory Program funded by the Alaska State Legislature and managed by State of Alaska, Department of Natural Resources (DNR), Division of Geological & Geophysical Surveys (DGGS). The program seeks to catalyze private-sector mineral development investment. The program delineates mineral zones on Alaska state lands that: 1) have major economic value; 2) can be developed in the short term to provide high quality jobs for Alaska; and 3) will provide economic diversification to help offset the loss of Prudhoe Bay oil revenue. The airborne data were acquired and processed under contract between the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS), and Fugro GeoServices, Inc. Fugro Airborne Surveys (now CGG), the subcontractor, acquired and processed the data in 2012 and 2013. Ownership of Fugro Airborne Surveys was transferred to CGG Canada Services Ltd. during the course of this project. Data acquisition, processing, and the type of products were all the same for the three surveys blocks. This file 'gpr2014_003_readme.pdf' includes file names and definitions and much general information. Page-sized location figures and images of the data are provided in the gpr2014_003_browsegraphic.pdf file, and as pdfs on the DVD version and through each download. All data are provided in NAD27, UTM zone 4N, except for Google Earth KMZ files, which are in Geographic Coordinate System (Simple Cylindrical projection) with a WGS84 datum. The bounding coordinates for all three surveys are given below in the 'Spatial_Domain Section'. The bounding coordinates for each survey block is given here. SOUTHERN DISHNA RIVER: (Iditarod and Ophir quadrangles) > West_Bounding_Coordinate: -157.92 > East_Bounding_Coordinate: -156.89 > North_Bounding_Coordinate: 63.14 > South_Bounding_Coordinate: 62.53 FOX HILLS: (Holy Cross and Iditarod quadrangles) > West_Bounding_Coordinate: -159.35 > East_Bounding_Coordinate: -158.59 > North_Bounding_Coordinate: 62.30 > South_Bounding_Coordinate: 62.14 BEAVER CREEK: (Iditarod quadrangle) > West_Bounding_Coordinate: -157.71 > East_Bounding_Coordinate: -157.16 > North_Bounding_Coordinate: 62.53 > South_Bounding_Coordinate: 62.25 201209 201408 publication date Complete None -159.35 -156.89 63.14 62.14 ISO 19115 Topic Category geoscientificInformation Alaska Division of Geological & Geophysical Surveys Aeromagnetic Map Aeromagnetic Survey Airborne Geophysical Survey Apparent Resistivity Data DIGHEM V EM System Electromagnetic Anomalies Electromagnetic Data Electromagnetic Survey Geophysics HEM Survey Interpretation Magnetic Survey Magnetics Alaska Division of Geological & Geophysical Surveys Alaska, State of Aniak Mining District Iditarod Mining District Innoko Mining District Holy Cross Quadrangle Iditarod Quadrangle Ophir Quadrangle Alaska Division of Geological & Geophysical Surveys Iditarod-Nixon Fork Fault 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). 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. Alaska Division of Geological & Geophysical Surveys Geophysics Staff mailing and physical

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Fairbanks AK 99709-3707 USA (907)451-5020 dggsgis@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays gpr2014_003_browsegraphic.pdf The browse graphic file contains four location maps showing: 1) survey area and adjacent published surveys within Alaska, 2) detailed diagram showing the location of the 63,360-scale map sheets, and 3) detailed diagram showing the location of the 31,680-scale map sheets. PDF Funding was provided by the Alaska State Legislature through the DGGS Airborne Geophysical/Geological Mineral Inventory (AGGMI) program. Microsoft Windows 7 Professional Version 2009 Service Pack 1; Geosoft Oasis Montaj Version 7.2; Autocad R14 and 2014 Map3D Version 2000; ESRI Shape file format; Adobe Acrobat Distiller v9.0; Adobe Acrobat Professional v9.0; Global Mapper v13.2; CGG proprietary software L.E. Burns Fugro Airborne Surveys Corp. Fugro GeoServices Inc. 2013 raster digital data, tabular digital data, vector digital data Geophysical Report GPR 2013-1 Fairbanks, AK, USA State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS) 1 DVD http://dx.doi.org/10.14509/26701 http://dggs.alaska.gov/pubs/gpdata/236 Burns, L.E. Fugro Airborne Surveys Corp. Fugro GeoServices, Inc. 2011 raster digital data, tabular digital data, vector digital data Geophysical Report GPR 2011-2 Fairbanks, AK, USA State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS) 1 DVD http://dx.doi.org/10.14509/22842 http://dggs.alaska.gov/pubs/gpdata/155 Burns, L.E. Stevens Exploration Management Corp. Fugro Airborne Surveys Corp. U. S. Bureau of Land Management 2000 raster digital data, tabular digital data, vector digital data Geophysical Report GPR 2000-38 Fairbanks, AK, USA State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS) 1 DVD http://dx.doi.org/10.14509/2721 http://dggs.alaska.gov/pubs/gpdata/60 Stevens, Mark Fugro Airborne Surveys Corp. 2000 Geophysical Report GPR 2000-40 Fairbanks, AK, USA State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS) 1 DVD http://dx.doi.org/10.14509/2723 http://dggs.alaska.gov/pubs/gpdata/60 Survey interpretation and documentation of data acquisition and tests done during acquisition were produced by the same company (CGG) who acquired the data. Tests completed and constraints used are documented in the project report. Ruth Pritchard, the project report author and data interpreter, has several decades of experience interpreting aeromagnetic and electromagnetic data and making EM anomaly picks. N/A The data are complete. Accuracy of the data was discussed in the metadata for GPR2013-1. The helicopter position was derived every 0.5 seconds using post-flight differential positioning to an accuracy of better than 1 m. The laser altimeter ('ALTLAS_BIRD'), located in the bird (EM equipment and magnetometer housing), had a stated resolution of 0.10 meter. The ALTLAS_BIRD value may be unreliable over bodies of water where the laser returns are scattered. CGG Unpublished material tabular digital data, raster digital data, vector digital data on DVD 2013 2013 CGG, 2013 A copy of the original raw and final geophysical data from the 20012-2013 Five Spot survey and other associated files are stored at the CGG office. Rather than using the version released by DGGS in 2013 (GPR2013-1), CGG used the files already available to them to provide data for the interpretation, EM anomaly picks, multichannel-stacked profiles included on this publication. To determine the location of electromagnetic (EM) anomalies or their boundaries, the DIGHEM(V) EM system measured inphase and quadrature components. Two DIGHEM (V) EM systems were used on this project, one associated with an Aerospatiale AS350B2 helicopter and the other with an Aerospatiale AS350B3 helicopter. The EM systems measured inphase and quadrature components at five frequencies. The DIGHEM(V) BKS51 system, associated with the AS350B2 helicopter, used two vertical coaxial-coil pairs which operated at 1115 (1000) and 5482 (5500) Hz while three horizontal coplanar-coil pairs operated at 921 (900), 7279 (7200), and 56,320 (56,000) Hz. The DIGHEM(V) BKS54 system, associated with the AS350B3 helicopter, used two vertical coaxial-coil pairs which operated at 1115 (1000) and 5741 (5500) Hz while three horizontal coplanar-coil pairs operated at 884 (900), 7077 (7200), and 56,150 (56,000) Hz. Appropriate flights can be found if needed in the linedata published in GPR2013-1. The EM data were sampled at 0.1 second intervals and interpolated onto a regular 80m grid using a modified Akima (1970) technique. The EM system responds to bedrock conductors, conductive overburden, and cultural sources. The power line monitor and the flight track video were examined to locate cultural sources. The EM anomalies that are indicated are classified by conductance. EM Anomalies are identified by creating multi-parameter stacked profiles for all survey lines at a scale of 1:31,680. Anomaly grades range from 0 to 7 and are based on calculated conductance. See the Project Report (GPR2014-3-1_ProjectReport.pdf; Table 12: EM Anomaly Statistics) for more information. The grade 0 anomaly, denoted by an �X�, indicates that in-phase and quadrature levels are below set thresholds and will not give a reliable calculation of the conductivity. These anomalies are shown with an asterisk (*) in the EM legend on the 1:31,680 scale maps (GPR2014-3-2a through GPR2014-3-2h). CGG, 2013 2014 Ruth Pritchard, a CGG geophysicist, wrote the project report and the interpretation of the processed geophysical data. For the interpretation maps, Ruth used CGG's in-house copy of the linedata, gridded data, and multi-channel stacked profiles for interpretation of anomalous data, lineations, and potential faults. Geologic references used in this interpretation are cited on page 78 of the project report. Besides the multichannel stacked profiles, which are included in the present publication, the other data used for analysis are available to the public as DGGS publication GPR2013-1. CGG, 2013 2014 Geophysical images and vectors used on the EM anomaly maps were converted to GeoTIFFs using CGG's specialized software. Vectors used on the interpretation maps were converted to GeoTIFFs and KMZs using CGG's specialized software. 2014 Three modified sections of the Alaska PLSS Section Grid (Bvr_SecGrid, Dish_SecGrid, and Fox_SecGrid), were taken from CGG's files. The files were also used in DGGS publication GPR2013-1; the process was documented there. CGG, 2013 2014 The HPGL/2 files were created with HP Designjet T1300ps HPGL driver v61.132.2518.500 and plot on some plotters, but not all plotters correctly. The Adobe Acrobat format files were created with Adobe Acrobat Distiller v9.0 from Postscript files. 2014 Universal Transverse Mercator 4N 0.9996 -159 0 500000 0 coordinate pair 0.01 0.01 meters North American Datum of 1927 Clarke 1866 6378206.4 294.978698 project_report_em_anomalies Adobe Acrobat format of CGG's project report with interpretation EM anomaly picks for the report in csv and Geosoft ASCII XYZ formats. 'FiveSpot_EMAnom_Readme.pdf included. CGG project_report_em_anomalies geotiff_kmz GeoTiffs of the Interpretation sheets and images with EM anomalies, flight paths, on residual magnetic intensity map. KMZs of the Interpretation sheets. CGG geotiff_kmz maps_hpgl2 hpgl2 format (.prn) maps. See gpr2014-3_readme.pdf. CGG maps_hpgl2 maps_pdf Adobe Acrobat (pdf) format maps. See gpr2014-3_readme.pdf. CGG maps_pdf sm_profiles_hpgl2 hpgl2 format of CGG's project stacked-multi channel profile. See Project Report for more information. CGG sm_profiles_hpgl2 sm_profiles_pdf Adobe Acrobat format of CGG's project stacked-multi channel profile. See Project Report for more information. CCG sm_profiles_pdf vectors ESRI Shape and Autocad DXF of interpretation, EM anomalies, and various locational reference files. See gpr2014-3_readme.pdf. CGG vectors Alaska Division of Geological & Geophysical Surveys mailing and physical

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Fairbanks AK 99709-3707 USA (907)451-5020 (907)451-5050 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. GPR 2014-3 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. Current geophysics publications are available on paper or Mylar. Please ask for the maps to be printed from HPGL/2 files to ensure the best quality image. To purchase 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. Contact DGGS for current pricing Geosoft ASCII (XYZ), ASCII text files (including CSV), GeoTiff, Google KMZ, Autocad DXF, ESRI shapefile, Adobe PDF http://dx.doi.org/10.14509/27326 Digital files on DVD are available for $10 plus shipping and are free when downloaded online. Software with ability to use, import, or convert Geosoft binary GDB or Geosoft ASCII XYZ files, Autocad DXF files, ESRI Shape files, Adobe Acrobat PDF, Google Earth files, and text files. Free downloadable interfaces to view or convert the gridded and dxf files are available at the Geosoft Web site (http://www.geosoft.com; Oasis Montaj viewer). The KMZ files can be dragged and dropped into the 'My Places' folder of the free downloadable 'Google Earth' software. Freeware software 'printfile' (http://www.lerup.com/printfile/) prints HPGL/2 files easily on compatible printers. The HPGL/2 files have brighter colors and sharper topography than the PDF maps and should be used for printing when possible. The PDF format maps are the only maps digitally viewable in this publication. 20150312 Alaska Division of Geological & Geophysical Surveys Metadata Manager mailing and physical

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Fairbanks AK 99709-3707 USA (907)451-5020 FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 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. http://www.dggs.alaska.gov/metadata/dggs.ext dggs metadata extensions