Field station locations and magnetic susceptibility data collected in 2020 and 2021 for the Western Tanacross project, Tanacross and Eagle quadrangles, Alaska

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Frequently anticipated questions:

What does this data set describe?

Title:
Field station locations and magnetic susceptibility data collected in 2020 and 2021 for the Western Tanacross project, Tanacross and Eagle quadrangles, Alaska
Abstract:
DGGS Raw Data File 2022-3, Field station locations and magnetic susceptibility data collected in 2020 and 2021 for the Western Tanacross project, Tanacross and Eagle quadrangles, Alaska, presents locations, field descriptions of rocks, and magnetic susceptibility measurements from rock outcrops and/or hand samples collected during 1:100,000-scale bedrock geologic mapping of 2600 square miles within the Tanacross and Eagle quadrangles. The field areas for the Western Tanacross project are approximately 20 miles north and southwest of Tok. The project area is of current and historic interest for potential mineral resource development, including quartz vein Au mineralization, placer Au deposits, granite-hosted tin mineralization, and intrusion-related Cu-Au deposits. Prospects in the area include Triton, Tushtena, Taurus, and others. Much of the field area was mapped at 1:250,000 scale by the USGS in the 1960s. This project aims to produce more accurate and modern geologic maps and supporting datasets that will promote mineral resource exploration in eastern Interior Alaska. All files are available from the DGGS website: http://doi.org/10.14509/30838.
Supplemental_Information: 
magnetic-susceptibility:    Magnetic susceptibility measurements, location coordinates, and field station descriptions
  1. How might this data set be cited?
    Gavel, M.M., Wypych, Alicja, Naibert, T.J., Avirett, D.F., Barrera, M.L., Hubbard, A.K., Newberry, R.J., Regan, S.P., Twelker, Evan, Wildland, A.D., and Wyatt, W.C., 2022, Field station locations and magnetic susceptibility data collected in 2020 and 2021 for the Western Tanacross project, Tanacross and Eagle quadrangles, Alaska: Raw Data File RDF 2022-3, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 2 p.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -143.993766
    East_Bounding_Coordinate: -141.832871
    North_Bounding_Coordinate: 64.258331
    South_Bounding_Coordinate: 63.246291
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 2020
    Ending_Date: 2021
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: table
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a point data set.
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest .0000001. Longitudes are given to the nearest .0000001. Latitude and longitude values are specified in decimal degrees. The horizontal datum used is WGS84.
      The ellipsoid used is WGS 84.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257223563000025.
  7. How does the data set describe geographic features?
    rdf2022-3-magnetic-susceptibility.csv
    Magnetic susceptibility measurements, location coordinates, and field station descriptions (Source: DGGS)
    station_number
    The label assigned in the field to identify the station. Generic example of a station identifier: YYAAA9999X: YY=last two digits of the year the station was collected, AAA=geologists initials (one to three characters), 9999=unique station number, X= optional alpha character which indicates that multiple samples were collected at a given location or that multiple observations were recorded in the project database. (Source: this report) text
    lon_wgs84
    Longitude, WGS84 (Source: this report) long integer
    lat_wgs84
    Latitude, WGS84 (Source: this report) long integer
    rock_description
    Description of the sample or station. (Source: this report) text
    mag1
    Magnetic susceptibility measurement; Zero and NULL values indicate that a magnetic susceptibility measurement was not measured. Units: 10^-3 SI. (Source: this report) long integer
    mag2
    Magnetic susceptibility measurement; Zero and NULL values indicate that a magnetic susceptibility measurement was not measured. Units: 10^-3 SI. (Source: this report) long integer
    mag3
    Magnetic susceptibility measurement; Zero and NULL values indicate that a magnetic susceptibility measurement was not measured. Units: 10^-3 SI. (Source: this report) long integer
    mag4
    Magnetic susceptibility measurement; Zero and NULL values indicate that a magnetic susceptibility measurement was not measured. Units: 10^-3 SI. (Source: this report) long integer
    mag5
    Magnetic susceptibility measurement; Zero and NULL values indicate that a magnetic susceptibility measurement was not measured. Units: 10^-3 SI. (Source: this report) long integer
    mag6
    Magnetic susceptibility measurement; Zero and NULL values indicate that a magnetic susceptibility measurement was not measured. Units: 10^-3 SI. (Source: this report) long integer
    mag7
    Magnetic susceptibility measurement; Zero and NULL values indicate that a magnetic susceptibility measurement was not measured. Units: 10^-3 SI. (Source: this report) long integer
    mag8
    Magnetic susceptibility measurement; Zero and NULL values indicate that a magnetic susceptibility measurement was not measured. Units: 10^-3 SI. (Source: this report) long integer
    mag9
    Magnetic susceptibility measurement; Zero and NULL values indicate that a magnetic susceptibility measurement was not measured. Units: 10^-3 SI. (Source: this report) long integer
    mag10
    Magnetic susceptibility measurement; Zero and NULL values indicate that a magnetic susceptibility measurement was not measured. Units: 10^-3 SI. (Source: this report) long integer
    mag11
    Magnetic susceptibility measurement; Zero and NULL values indicate that a magnetic susceptibility measurement was not measured. Units: 10^-3 SI. (Source: this report) long integer
    mag12
    Magnetic susceptibility measurement; Zero and NULL values indicate that a magnetic susceptibility measurement was not measured. Units: 10^-3 SI. (Source: this report) long integer
    average
    Average magnetic susceptibility, units: 10^-3 SI. (Source: this report) long integer
    number_measurements
    Number of magnetic susceptibility measurements (Source: this report) short integer

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
  2. Who also contributed to the data set?
    The DGGS Western Tanacross Project was funded by State of Alaska General Funds and the U.S. Geological Survey under Cooperative Agreement Number G20AC00156. Disclaimer: The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the opinions or policies of the U.S. Geological Survey. Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.
  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?

This project aims to produce more accurate and modern geologic maps and supporting datasets that will promote mineral resource exploration in eastern Interior Alaska.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 2021 (process 1 of 2)
    Field data collection - Location data for field stations were collected using GPS-enabled tablets or smartphones running the ESRI Collector App. Rock descriptions are composed of observations and interpretations made by project geologists in the field or in the field office. Station descriptions were lightly edited for clarity, but they have not been reviewed for technical content and should be considered preliminary. Magnetic susceptibility measurements were collected using Terraplus KT-10 model handheld magnetic susceptibility meters. The values reported here are for individual measurements performed on representative surfaces of the sampled rock outcrop.
    Date: 2022 (process 2 of 2)
    Select field station descriptions were updated to correct a programming error: '21SSM001','21SSM004','21SSM003','21WCW016','21WCW015','21WCW014','21WCW013','21WCW012','21WCW010','21WCW009','21WCW008','21WCW007','21WCW006','21WCW005','21WCW004','21WCW003','21WCW002','21WCW001','21TJN230','21TJN229','21TJN228','21TJN227','21TJN226','21TJN225','21TJN224','21TJN207','21TJN206','21TJN205','21TJN180','21TJN179','21TJN178','21TJN177','21TJN176','21TJN144','21TJN143','21TJN141','21TJN140','21TJN139','21TJN138','21TJN137','21TJN136','21TJN098','21TJN097','21TJN096','21TJN095','21TJN094','21TJN093','21TJN092','21TJN091','21TJN081','21TJN080','21TJN079','21TJN078','21TJN077','21TJN076','21TJN075','21TJN074','21TJN073','21TJN072','21TJN071','21TJN069','21TJN068','21TJN067','21TJN066','21TJN065','21TJN064','21TJN063','21TJN062','21TJN061','21TJN060','21TJN059','21TJN058','21TJN057','21TJN056','21TJN055','21TJN053','21TJN052','21TJN051','21TJN050','21TJN049'
  3. What similar or related data should the user be aware of?
    Gavel, M.M., Wypych, Alicja, Naibert, T.J., Avirett, D.F., Barrera, M.L., Hubbard, A.K., Newberry, R.J., Regan, S.P., Twelker, Evan, Wildland, A.D., and Wyatt, W.C., 2022, Field station locations and magnetic susceptibility data collected in 2021 for the Taylor Mountain project, Tanacross and Eagle quadrangles, Alaska: Raw Data File RDF 2022-2, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 2 p

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

  1. How well have the observations been checked?
    Field rock descriptions are composed of observations and interpretations made by project geologists in the field or in the field office. Field observations and rock descriptions in this data file have not been reviewed for technical content and should be considered preliminary. As the project commences, further observations, geochemical data, microscopic investigation, or other information may provide additional insights into sample and station lithology or features. Magnetic susceptibility measurements were collected using Terraplus KT-10 model handheld magnetic susceptibility meters. The KT-10 meters have a maximum sensitivity of 1 x 10^-6 SI units on smooth surfaces and a measurable susceptibility range between 0.001 x 10^-3 and 1999.99 x 10^-3 SI.
  2. How accurate are the geographic locations?
    Location data for field stations were collected using GPS-enabled tablets or smartphones running the ESRI Field Maps App. Data were merged into an ArcGIS geodatabase. The devices have a reported error between 10-12 m. Latitude and longitude are reported in the WGS84 datum.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    This data release is complete. Revised descriptions may become available in the future through new publications, DGGS web services, or division databases.
  5. How consistent are the relationships among the observations, including topology?
    Not applicable

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? RDF 2022-3
  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?

Who wrote the metadata?

Dates:
Last modified: 02-Mar-2022
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:
Generated by mp version 2.9.50 on Tue Mar 01 17:32:09 2022