Bedrock geologic map of the Circle mining district, Alaska

Frequently anticipated questions:

• What does this data set describe?
  1. How might this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  3. What similar or related data should the user be aware of?
• How reliable are the data; what problems remain in the data set?
  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How might this data set be cited?
   Wiltse, M.A., Reger, R.D., Newberry, R.J., Pessel, G.H., Pinney, D.S., Robinson, M.S., and Solie, D.N., 1995, Bedrock geologic map of the Circle mining district, Alaska: Report of Investigation RI 95-2B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

   Online Links:

   • https://doi.org/10.14509/2515

   Other_Citation_Details: 1 sheet, scale 1:63,360
   

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -145.721463
   East_Bounding_Coordinate: -144.481445
   North_Bounding_Coordinate: 65.585826
   South_Bounding_Coordinate: 65.368257
   

3. What does it look like?
4. Does the data set describe conditions during a particular time period?

   Beginning_Date: 1994

   Ending_Date: 1995

   Currentness_Reference:

   ground condition

5. What is the general form of this data set?

   Geospatial_Data_Presentation_Form: geodatabase
   

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?
      This is a vector data set.
   2. What coordinate system is used to represent geographic features?
      

      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 coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest .00000001
      Ordinates (y-coordinates) are specified to the nearest .00000001
      Planar coordinates are specified in Meters
      The horizontal datum used is NAD27.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.40000000037.
      The flattening of the ellipsoid used is 1/294.978698199999997.
      
7. How does the data set describe geographic features?

   circle_mining_district_bedrock_ak_gems_db_pkg

   Geodatabase, layer files, style files, and fonts (Source: Alaska Division of Geological & Geophysical Surveys)

   circle_mining_district_bedrock_gems_db_pkg

   Geodatabase, layer files, style files, and fonts (Source: Alaska Division of Geological & Geophysical Surveys)

   circle_mining_district_bedrock_gems_shapefile_pkg

   Shapefiles and open data files (Source: Alaska Division of Geological & Geophysical Surveys)

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Wiltse, M.A.
   • Reger, R.D.
   • Newberry, R.J.
   • Pessel, G.H.
   • Pinney, D.S.
   • Robinson, M.S.
   • Solie, D.N.
2. Who also contributed to the data set?

   This map has been compiled and drawn under contract between the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, and WGM, Mining and Geological Consultants, Inc. Airborne geophysical data for the area were acquired by Dighem Surveys & Processing, Inc. in 1993. Geologic map conversion to the GeMS standard was funded by the USGS National Cooperative Geologic Mapping Program under StateMap award number G20AC00367, 2020, and the State of Alaska General Fund. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government.

3. To whom should users address questions about the data?
   Alaska Division of Geological & Geophysical Surveys

   Metadata Manager

   3354 College Road

   Fairbanks, AK
   

   USA

   (907)451-5020 (voice)

   (907)451-5050 (FAX)

   dggspubs@alaska.gov

   Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
   Contact_Instructions:

   Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.

Why was the data set created?

The investigation of gold and other mineral occurrences in conjunction with comprehensive geologic mapping and recently acquired geophysical data provide a scientific basis for continued mineral exploration throughout the Circle mining district project area.

How was the data set created?

1. From what previous works were the data drawn?

   Burns, L.E. and others, 2019 (source 1 of 8)

   Burns, L.E., Barefoot, J.D., Woods, Rebecca-Ellen, WGM Mining and Geological Consultants, Inc., and Dighem Surveys and Processing, 2019, Circle electromagnetic and magnetic airborne geophysical survey data compilation: Geophysical Report GPR 2019-3, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

   Online Links:

   • https://doi.org/10.14509/30167

   Other_Citation_Details: 4 p
   

   Type_of_Source_Media: paper
   Source_Contribution: Geologic map compilation
   

   Ekberg, P.G. and others, 2021 (source 2 of 8)

   Ekberg, P.G., Hendricks, M.D., and Athey, J.E., 2021, AK GeMS symbology: A description of the AK GeMS style file: Miscellaneous Publication MP 169, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

   Online Links:

   • https://doi.org/10.14509/30584

   Other_Citation_Details: 7 p
   

   Type_of_Source_Media: paper
   Source_Contribution: GIS analysis and digital cartography
   

   Hendricks, M.D. and others, 2021 (source 3 of 8)

   Hendricks, M.D., Ekberg, P.G., Athey, J.E., Wyatt, W.C., Willingham, A.L., and Naibert, T.J., 2021, AK GeMS data dictionary: A description of the Alaska geologic mapping schema: Miscellaneous Publication MP 170, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

   Online Links:

   • https://doi.org/10.14509/30669

   Other_Citation_Details: 10 p
   

   Type_of_Source_Media: paper
   Source_Contribution: GIS analysis and digital cartography
   

   Newberry, R.J. and others, 1994 (source 4 of 8)

   Newberry, R.J., Wiltse, M.A., Queen, L.K., and Pinney, D.S., 1994, Geochemical major-oxide and trace-element data for rock samples collected in the Circle mining district, June 1993: Public Data File PDF 94-32A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

   Online Links:

   • https://doi.org/10.14509/1658

   Other_Citation_Details: 7 p., 1 sheet, scale 1:63,360
   

   Type_of_Source_Media: paper
   Source_Scale_Denominator: 63360
   Source_Contribution: Geologic map compilation
   

   Wiltse, M.A. and others, 1994 (source 5 of 8)

   Wiltse, M.A., Metz, P.A., Robinson, M.S., and Pinney, D.S., 1994, Electronic file of geochemical trace-element data for stream sediment samples collected in the Circle mining district, 1983: Public Data File PDF 94-30B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

   Online Links:

   • https://doi.org/10.14509/1656

   Other_Citation_Details: 6 p., 1 DVD
   

   Type_of_Source_Media: paper
   Source_Contribution: Geologic map compilation
   

   Wiltse, M.A. and others, 1994 (source 6 of 8)

   Wiltse, M.A., Metz, P.A., Robinson, M.S., and Pinney, D.S., 1994, Geochemical trace-element data for stream sediment samples collected in the Circle mining district, 1983: Public Data File PDF 94-30A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

   Online Links:

   • https://doi.org/10.14509/1655

   Other_Citation_Details: 86 p., 1 sheet, scale 1:63,360
   

   Type_of_Source_Media: paper
   Source_Scale_Denominator: 63360
   Source_Contribution: Geologic map compilation
   

   Wiltse, M.A. and others, 1994 (source 7 of 8)

   Wiltse, M.A., Queen, L.K., and Pinney, D.S., 1994, Geochemical trace-element data for rock samples collected in the Circle mining district, June 1993: Public Data File PDF 94-31A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

   Online Links:

   • https://doi.org/10.14509/1657

   Other_Citation_Details: 33 p., 1 sheet, scale 1:63,360
   

   Type_of_Source_Media: paper
   Source_Scale_Denominator: 63360
   Source_Contribution: Geologic map compilation
   

   U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020 (source 8 of 8)

   U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020, GeMS (Geologic Map Schema)—A standard format for the digital publication of geologic maps: Techniques and Methods TM 11-B10, U.S. Geological Survey, United States.

   Online Links:

   • https://dggs.alaska.gov/pubs/id/30585

   Other_Citation_Details: 1 p
   

   Type_of_Source_Media: paper
   Source_Contribution: GIS analysis and digital cartography
   

2. How were the data generated, processed, and modified?

   Date: 1994 (process 1 of 4)

   Bedrock geologic mapping - The Alaska Divisions of Geological & Geophysical Surveys (DGGS) staff conducted field studies throughout the map area. Geologists observed details about the variations in texture, lithology, and orientation of the map units, collected rock samples, noted outcrop descriptions, and conducted structural measurements. Field observations were integrated with existing literature and geophysical survey data.

   Date: 1995 (process 2 of 4)

   Laboratory data compilation - Selected samples were submitted for geochronologic and geochemical analysis. The results were used to further interpret the stratigraphic and structural history of the map area.

   Date: 1995 (process 3 of 4)

   Geologic map compilation - The geologic data were digitized from a mylar compilation of geologic field maps produced on USGS topo bases of the area. Locations were determined visually using topographic maps at scales of 1:63,360 and 1:25,000. Geologic contacts, samples, and station locations were visually hand-plotted onto stable mylar bases from the field maps. Data were digitally compiled and plotted using ArcInfo software. The coordinates of sample and station locations were determined using a digitizing tablet output. The map and report received technical review and editing by several scientists familiar with the subject matter. The authors incorporated the reviewers' suggestions into the final draft when deemed appropriate. Data sources used in this process:

   • Burns, L.E. and others, 2019
   • Newberry, R.J. and others, 1994
   • Wiltse, M.A. and others, 1994
   • Wiltse, M.A. and others, 1994
   • Wiltse, M.A. and others, 1994

   Date: 2021 (process 4 of 4)

   GIS analysis and digital cartography - This data distribution package's geologic and geographic features were organized and attributed according to the AK GeMS geologic mapping schema. The data were then programmatically transformed to provide download options in three formats: (1) an AK GeMS data package that includes the complete AK GeMS database and associated files, (2) a GeMS data package that is a conversion of the AK GeMS database into the base GeMS standard published by the USGS, and (3) a shapefile data package that includes two simple shapefile representations of the data. Data sources used in this process:

   • Ekberg, P.G. and others, 2021
   • Hendricks, M.D. and others, 2021
   • U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020

3. What similar or related data should the user be aware of?
   Reger, R.D., and Pinney, D.S., 1995, Surficial geologic map of the Circle mining district, Alaska: Report of Investigation RI 95-2C, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

   Online Links:

   • https://doi.org/10.14509/2516

   Other_Citation_Details: 1 sheet, scale 1:63,360
   

   Wiltse, M.A., Metz, P.A., Robinson, M.S., and Pinney, D.S., 1994, Electronic file of geochemical trace-element data for stream sediment samples collected in the Circle mining district, 1983: Public Data File PDF 94-30B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

   Online Links:

   • https://doi.org/10.14509/1656

   Other_Citation_Details: 6 p., 1 DVD
   

   Wiltse, M.A., Metz, P.A., Robinson, M.S., and Pinney, D.S., 1994, Geochemical trace-element data for stream sediment samples collected in the Circle mining district, 1983: Public Data File PDF 94-30A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

   Online Links:

   • https://doi.org/10.14509/1655

   Other_Citation_Details: 86 p., 1 sheet, scale 1:63,360
   

   Wiltse, M.A., Reger, R.D., Newberry, R.J., Pessel, G.H., Pinney, D.S., Robinson, M.S., and Solie, D.N., 1995, Geologic map of the Circle mining district, Alaska: Report of Investigation RI 95-2A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

   Online Links:

   • https://doi.org/10.14509/2514

   Other_Citation_Details: 1 sheet, scale 1:63,360
   

How reliable are the data; what problems remain in the data set?

1. How well have the observations been checked?
   Certainty in attribute interpretation varies throughout the map and is scale-dependent. Attribute fields within each feature class record the authors' degree of confidence in the existence or identity of applicable features.
2. How accurate are the geographic locations?
   Certainty in feature boundaries or location varies throughout the map. Data fields within each feature class and the accompanying orientation and location confidence lookup tables record the authors' degree of confidence in the location of applicable features.
3. How accurate are the heights or depths?
   
4. Where are the gaps in the data? What is missing?
   This publication is released as a DGGS Report of Investigations (RI). An RI is the completed product of original research and analysis, and RIs use professional cartography and undergo rigorous peer review, editing, and revision.
5. How consistent are the relationships among the observations, including topology?
   All polygon features were topologically validated according to specifications of the AK GeMS geologic mapping schema.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

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.

1. Who distributes the data set? (Distributor 1 of 1)
   
   Alaska Division of Geological & Geophysical Surveys

   Metadata Manager

   3354 College Road

   Fairbanks, AK
   

   USA

   (907)451-5020 (voice)

   (907)451-5050 (FAX)

   dggspubs@alaska.gov

   Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
   Contact_Instructions:

   Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.

2. What's the catalog number I need to order this data set? RI 95-2B
3. What legal disclaimers am I supposed to read?

   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.

4. How can I download or order the data?
   • Availability in 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.
   • Cost to order the data: Contact DGGS for current pricing

   • Availability in digital form:

     Data format:	geodatabase
     Network links:	https://doi.org/10.14509/2515

   • Cost to order the data: Free download

Who wrote the metadata?

Dates:

Last modified: 04-Sep-2021

Metadata author:

Alaska Division of Geological & Geophysical Surveys

Attn: Simone Montayne

Metadata Manager

3354 College Road

Fairbanks, AK

USA

(907)451-5020 (voice)

(907)451-5050 (FAX)

dggspubs@alaska.gov

Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays

Metadata standard:

FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

Metadata extensions used:

• https://dggs.alaska.gov/metadata/dggs.ext