Identification_Information: Citation: Citation_Information: Originator: Fugro Airborne Surveys Originator: Stevens Exploration Management Corp. Originator: Burns, L.E. Originator: Graham, G.R.C. Publication_Date: 2018 Title: Electromagnetic and magnetic airborne-geophysical survey of the Liberty Bell area, western Bonnifield mining district, Alaska (data compilation) Geospatial_Data_Presentation_Form: digital data Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2018-10 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 12 p. Online_Linkage: http://doi.org/10.14509/29690 Description: Abstract: The Liberty Bell geophysical survey was originally flown in 2001 and published in 2002 (Alaska Division of Geological & Geophysical Surveys and others, 2002) as a part of the State of Alaska's Airborne Geophysical/Geological Mineral Inventory (AGGMI) program. This publication supersedes the previous publications to provide a compilation of published and unpublished information and includes standardized databases and product formats, upgrades digital datasets to modern formats, and re-releases the historical survey and associated documentation (http://doi.org/10.14509/29690). This publication contains geophysical data produced from airborne surveys flown from the 24th to 27th of August 2001 for 2,023.6 line kilometers at 400m line spacing in the Bonnifield mining district, Alaska. This DIGHEMV electromagnetic/magnetic survey was flown by Fugro Airborne Surveys Corp. under contract to Stevens Exploration Management Corp. Purpose: The Liberty Bell airborne magnetic and electromagnetic survey, located in the northern foothills of the Alaska Range of central Interior Alaska, covers part of the Bonnifield mining district, which contains known intrusion-related and placer gold deposits and occurrences. It is also prospective for porphyry copper +/- gold +/- molybdenum +/- silver, skarn, volcanogenic massive sulfide, and other deposit types. The survey is part of the AGGMI program to acquire data on Alaska's most promising mineral belts and districts aimed at catalyzing private sector exploration. Supplemental_Information: >ascii_data: ascii format final and raw data with readme files, ascii format gridded data, Geosoft format import template with extension .iO for final ascii data >databases_geosoft: Geosoft format database of final line data with readme files; note: these data are provided in both UTM NAD27 and geographic WGS84 projections. >documents: Field operations report, gridded data explanations, survey background information, processor notes. >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: Google Earth kmz files of all gridded data; note: these files use the WGS84 datum. >maps_pdf_format: Printable maps in pdf format. >maps_prn_format: Printable maps in HPGL/2 printer file format with extension .prn. >profiles_stacked_pdf: Electromagnetic and magnetic data profiles with EM anomalies, files in PDF format >profiles_stacked_prn: Electromagnetic and magnetic data profiles with EM anomalies, files in PRN format >vector_data: Line path, data contours, and survey boundary in ESRI shape file (SHP) and Autocad (2000) DXF formats. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 2001 Ending_Date: 2018 Currentness_Reference: ground condition Status: Progress: complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -149.161346 East_Bounding_Coordinate: -148.482612 North_Bounding_Coordinate: 64.258160 South_Bounding_Coordinate: 63.990150 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: Aeromagnetic Survey Theme_Keyword: Airborne Geophysical Survey Theme_Keyword: Apparent Resistivity Data Theme_Keyword: Apparent Resistivity Map Theme_Keyword: Apparent Resistivity Survey Theme_Keyword: DIGHEM-V EM System Theme_Keyword: Digital Elevation Model 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: Magnetics Theme_Keyword: Resistivity Theme_Keyword: Resistivity Survey Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Alaska, State of Place_Keyword: Bonanza Creek Place_Keyword: Bonnifield Mining District Place_Keyword: Buzzard Creek Place_Keyword: California Creek Place_Keyword: Chicken Creek Place_Keyword: Coal Creek Place_Keyword: Cody Creek Place_Keyword: Daniels Creek Place_Keyword: Eagle Creek Place_Keyword: Elsie Creek Place_Keyword: Emma Creek Place_Keyword: Eva Creek Place_Keyword: Fairbanks Quadrangle Place_Keyword: Fourth of July Creek Place_Keyword: Homestake Creek Place_Keyword: Iron Creek Place_Keyword: Liberty Bell Mine Place_Keyword: Little Moose Creek Place_Keyword: Lynx Creek Place_Keyword: Marguerite Creek Place_Keyword: McAdam Creek Place_Keyword: Rex Creek Place_Keyword: Rex Dome Place_Keyword: Saint Charles Creek Place_Keyword: Spruce Creek Place_Keyword: Steep Creek Place_Keyword: Wilson Creek Place_Keyword: Winter Creek 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: 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 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 Data_Set_Credit: This project was funded by the State of Alaska's Airborne Geophysical/Geological Mineral Inventory (AGGMI) program. Cross_Reference: Citation_Information: Originator: Athey, J.E. Originator: Newberry, R.J. Originator: Werdon, M.B. Originator: Freeman, L.K. Originator: Smith, R.L. Originator: Szumigala, D.J. Publication_Date: 2006 Title: Bedrock geologic map of the Liberty Bell area, Fairbanks A-4 Quadrangle, Bonnifield mining district, Alaska Series_Information: Series_Name: Report of Investigation Issue_Identification: RI 2006-2 v. 1.0.1 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 98 p., 1 sheet, scale 1:50,000 Online_Linkage: http://doi.org/10.14509/15026 Cross_Reference: Citation_Information: Originator: Burns, L.E. Originator: Fugro Airborne Surveys Corp. Originator: Stevens Exploration Management Corp. Originator: Graham, G.R.C. Originator: Emond, A.M. Publication_Date: 2016 Title: Bonnifield mining district electromagnetic and magnetic airborne geophysical survey, data compilation Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2016-1 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Online_Linkage: http://doi.org/10.14509/29557 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Geophysical data were acquired according to contractor, contract, and request for proposals specifications. These data are positioned with differential GPS. The magnetometer used had a sensitivity of 0.01 nT. Resistivity sensitivity varies among the different frequencies from 0.06 ppm to .60 ppm. Details are given in the Liberty Bell project report found at http://doi.org/10.14509/29690 Logical_Consistency_Report: Geophysical data were acquired according to contractor, contract, and request for proposals specifications. These data are positioned with differential GPS. The originating coordinate system was retained for all publication products except the KMZ files, which utilize WGS84 geographic coordinates. In some cases, values are provided in both UTM NAD27 and geographic WGS84 projections. Completeness_Report: This publication release provides the entire dataset generated by this project. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The helicopter position was derived every 0.5 seconds using post-flight differential positioning to a relative accuracy of better than 10 m. Positional accuracy of the presented data is better than 5 m with respect to the UTM grid. Further inaccuracies may be introduced by the interpolation and gridding process. These data are positioned with post processed differential GPS. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Manufacturer's accuracy on the radar altimeter used during data acquisition is 3.0 meters. The accuracy of the elevation calculation used for the digital terrain model is directly dependent on the accuracy of the two input parameters, ALTR and GPS-Z. The ALTR value may be erroneous in areas of heavy tree cover, where the altimeter reflects the distance to the tree canopy rather than the ground. The GPS-Z value is primarily dependent on the number of available satellites. Although post-processing of GPS data will yield X and Y accuracies in the order of 5 meters, the accuracy of the Z value is usually much less, sometimes in the +/-20 meter range. Further inaccuracies may be introduced during the interpolation and gridding process. These data are positioned with post processed differential GPS. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Alaska Division of Geological & Geophysical Surveys Originator: Fugro Airborne Surveys Originator: Stevens Exploration Management Corp. Originator: Burns, L.E. Publication_Date: 2002 Title: Line, grid, and vector data of airborne geophysical survey data for the Liberty Bell area, western Bonnifield mining district, central Alaska Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2002-7 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 DVD Online_Linkage: http://doi.org/10.14509/2807 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2002 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Alaska Division of Geological & Geophysical Surveys and others, 2002 Source_Contribution: Legacy data compilation Source_Information: Source_Citation: Citation_Information: Originator: Burns, L.E. Publication_Date: 2002 Title: Portfolio of aeromagnetic and resistivity maps of the Liberty Bell area, western Bonnifield mining district, central Alaska Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2002-10 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 14 p Online_Linkage: http://doi.org/10.14509/2810 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2002 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E., 2002 Source_Contribution: Legacy data compilation Source_Information: Source_Citation: Citation_Information: Originator: Pritchard, R.A. Originator: Fugro Airborne Surveys Publication_Date: 2002 Title: Project report of the airborne geophysical survey of the Liberty Bell area, western Bonnifield mining district, central Alaska Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2002-9 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 172 p., 1 sheet, scale 1:63,360 Online_Linkage: http://doi.org/10.14509/2809 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2002 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Pritchard, R.A. and Fugro Airborne Surveys, 2002 Source_Contribution: Data collection, processing, and delivery Process_Step: Process_Description: Data collection, processing, and delivery - The airborne geophysical data were acquired under contract. 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. Source_Used_Citation_Abbreviation: Alaska Division of Geological & Geophysical Surveys and others, 2002 Source_Used_Citation_Abbreviation: Pritchard, R.A. and Fugro Airborne Surveys, 2002 Process_Date: 2002 Process_Step: Process_Description: Legacy data compilation - DGGS staff compiled and organized previously published data and the originating data from the contractor. Original vector data were converted into ESRI shapefiles using ArcMap 10.3.1's Export to Shapefile tool. 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 'magigrf' 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: Burns, L.E., 2002 Process_Date: 2016 Process_Step: Process_Description: Data in Geosoft GDB format - These data were created by importing the final ASCII data into Geosoft Oasis montaj v8.5.1 using the created *.iO import file. Process_Date: 2016 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 v8.5.1. Process_Date: 2016 Process_Step: Process_Description: Geographically registered gridded data in GeoTiff format - These data were created by DGGS using Geosft Oasis Montaj v8.5.1. 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. Process_Date: 2016 Process_Step: Process_Description: Google Earth KMZ files - Created Google Earth KMZ files from the GeoTiff format gridded data using ESRI ArcGIS 10.3.1. Process_Date: 2016 Process_Step: Process_Description: Boundary polygon - The boundary polygon was generated by loading the final line data in Geosoft Oasis Montaj v8.5.1. The final magnetic data were 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 ESRI shapefile. Process_Date: 2016 Process_Step: Process_Description: ErMapper ERS files - Created ErMapper ERS files from grids using Geosoft grid utility, Copy/Convert. Using the ErMapper (*.ers) convert option, transfers the grid value to the .ers format file. The .ers format data created from GeoSoft 9.1. Process_Date: 2017 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: .00000001 Ordinate_Resolution: .00000001 Planar_Distance_Units: Meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.40000000037 Denominator_of_Flattening_Ratio: 294.978698199999997 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: ascii_data Entity_Type_Definition: ASCII format line data, other ASCII data Entity_Type_Definition_Source: Fugro Airborne Surveys Corp. 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 of final line data, other Geosoft format databases Entity_Type_Definition_Source: Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp. Entity_Attribute_Layer_Name: databases_geosoft Detailed_Description: Entity_Type: Entity_Type_Label: documents Entity_Type_Definition: Project and field reports, survey background information, gridded data explanations, other documentation Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS), Fugro Airborne Surveys Corp. 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, ER Mapper ERS format Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS) 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 Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS), Fugro Airborne Surveys Corp. 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 Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS) Entity_Attribute_Layer_Name: images_registered Detailed_Description: Entity_Type: Entity_Type_Label: kmz Entity_Type_Definition: KML language kmz archive files of project data; note: these files use the WGS84 datum Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS), Fugro Airborne Surveys Corp. 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), Fugro Airborne Surveys Corp. 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 HPGL/2 printer file format with extension .prn. Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS), Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp. Entity_Attribute_Layer_Name: maps_prn_format Detailed_Description: Entity_Type: Entity_Type_Label: profiles_stacked_pdf Entity_Type_Definition: Electromagnetic and magnetic data profiles with EM anomalies, files in PDF format Entity_Type_Definition_Source: Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp. Entity_Attribute_Layer_Name: profiles_stacked_pdf Detailed_Description: Entity_Type: Entity_Type_Label: profiles_stacked_prn Entity_Type_Definition: Electromagnetic and magnetic data profiles with EM anomalies, files in PRN format Entity_Type_Definition_Source: Fugro Airborne Surveys Corp. and Stevens Exploration Management Corp. Entity_Attribute_Layer_Name: profiles_stacked_prn Detailed_Description: Entity_Type: Entity_Type_Label: vector_data Entity_Type_Definition: line path, data contours, em anomalies, interpretation and survey boundary in ESRI shape file (SHP) and Autocad (2000) DXF formats Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS), Fugro Airborne Surveys Corp. 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_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 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 Resource_Description: GPR 2018-10 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://doi.org/10.14509/29690 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20180622 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Person: Simone Montayne 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 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 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