Field station locations and magnetic susceptibility data for the Chena-Pogo and Mount Harper projects, Big Delta and Circle quadrangles, Alaska, collected June-September 2023

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Frequently anticipated questions:


What does this data set describe?

Title:
Field station locations and magnetic susceptibility data for the Chena-Pogo and Mount Harper projects, Big Delta and Circle quadrangles, Alaska, collected June-September 2023
Abstract:
Field station locations and magnetic susceptibility data for the Chena-Pogo and Mount Harper projects, Big Delta and Circle quadrangles, Alaska, collected June-September 2023, Raw Data File 2023-27, provides field station locations and magnetic susceptibility data for the Chena-Pogo and Mount Harper projects, Big Delta and Circle quadrangles, Alaska, collected June-September 2023, Raw Data File 2023-27, provides locations, field descriptions of rocks, and magnetic susceptibility measurements from rock outcrop and/or hand samples from the Mount Harper and the Chena-Pogo project areas. The field area for the Mount Harper project is north of Delta Junction and northeast of the Alaska Highway and extends southeast to 40-50 miles northwest of Tok. The Chena-Pogo project area is 0-200 miles south and east of Chena Hot Springs. During the 2023 field season, geologists from the Alaska Division of Geological & Geophysical Surveys (DGGS) conducted 1:100,000-scale bedrock geologic mapping of ~5,700 mi2 (~15,000 km2) within the Big Delta and Circle quadrangles, Alaska. The project areas are of current and historical interest for potential mineral resource development, including quartz vein gold (Au) systems, placer Au deposits, granite-hosted tin mineralization, and intrusion-related copper (Cu)-Au deposits. The Chena-Pogo and Mount Harper areas include the Pogo lode gold mine and the Healy, Lucky 13, Eagle, and many other prospects. The DGGS Mount Harper and Chena-Pogo projects aim to produce more accurate and integrated modern geologic maps and supporting datasets to promote mineral resource exploration in eastern Interior Alaska. These data are available from the DGGS website: http://doi.org/10.14509/31096.
Supplemental_Information:
station-descriptions:    Field station locations and rock magnetic measurements
  1. How might this data set be cited?
    Gavel, M.M., Twelker, Evan, Wypych, Alicja, Naibert, T.J., Newberry, R.J., Szumigala, D.J., Wildland, A.D., Barrera, M.L., Biegel, J.N., Harvey, D.A., Ketcham, R.A., Muller, I.P., and Regan, S.P., 2023, Field station locations and magnetic susceptibility data for the Chena-Pogo and Mount Harper projects, Big Delta and Circle quadrangles, Alaska, collected June-September 2023: Raw Data File RDF 2023-27, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 3 p
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -147.366176
    East_Bounding_Coordinate: -143.830664
    North_Bounding_Coordinate: 65.209297
    South_Bounding_Coordinate: 64.068892
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2023
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: csv
  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 0.000001. Longitudes are given to the nearest 0.000001. 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 1/298.257223563.
  7. How does the data set describe geographic features?
    rdf2023-27-station-descriptions.csv, rdf2023-27-station-descriptions-data-dictionary.csv
    Field station locations and rock magnetic measurements (Source: DGGS)

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 Mount Harper project is funded by State of Alaska Capital funds and the U.S. Geological Survey's Earth Mapping Resources Initiative (Earth MRI) under Cooperative Agreement Number G23AC00372. 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
    GIS Manager
    3354 College Rd
    Fairbanks, AK
    USA

    907-451-5020 (voice)
    dggsgis@alaska.gov
    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays

Why was the data set created?

The purpose of the Mount Harper and Pogo projects is to produce more accurate, detailed, and modern geologic maps and supporting datasets that will promote mineral resource exploration in eastern Interior Alaska. The project areas are of current and historical interest for potential mineral resource development, including quartz vein gold (Au) systems, placer Au deposits, granite-hosted tin mineralization, and intrusion-related copper (Cu)-Au deposits.

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: 2023 (process 1 of 2)
    Field rock descriptions - During the 2023 field season, geologists from the Alaska Division of Geological & Geophysical Surveys (DGGS) conducted 1:100,000-scale bedrock geologic mapping of ~5,700 mi2 (~15,000 km2) within the Big Delta and Circle quadrangles, Alaska. Field rock descriptions are observations and interpretations made by project geologists in the field.
    Date: 2023 (process 2 of 2)
    Magnetic susceptibility measurements - 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 Système International (S.I.) units on smooth surfaces and a measurable susceptibility range between 0.001 x 10-3 and 1,999.99 x 10-3 S.I. The values reported here are for individual measurements performed on representative surfaces of the sampled rock outcrop and/or hand samples. Up to 12 susceptibility readings were recorded at each field station. We measured multiple sides of outcrops and/or hand samples to avoid atmospheric effects whenever possible. Magnetic susceptibility was not measured at a small portion of field stations because hand samples were intensely weathered or not large enough to cover the coil of the KT-10 meter for accurate measurement. These stations are presented with zero measurements for completeness.
  3. What similar or related data should the user be aware of?
    Gavel, M.M., Twelker, Evan, Wypych, Alicja, Naibert, T.J., Newberry, R.J., Szumigala, D.J., Wildland, A.D., Barrera, M.L., Blackwell, N.J., Fessenden, S.N., Harvey, D.A., and Muller, I.P., 2023, Field station locations and magnetic susceptibility data collected in 2022 for the Mount Harper project, Eagle, Big Delta, and Mount Hayes quadrangles, Alaska: Raw Data File RDF 2023-6, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 3 p
    Wypych, Alicja, Twelker, Evan, Naibert, T.J., Gavel, M.M., Newberry, R.J., Szumigala, D.J., Wildland, A.D., Barrera, M.L., Harvey, D.A., Muller, I.P., Fessenden, S.N., and Blackwell, N.J., 2023, Geochemical data from samples collected in 2022 for the Mount Harper geologic mapping project, Big Delta, Mount Hayes, and Eagle quadrangles, Alaska: Raw Data File RDF 2023-24, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 3 p

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

  1. How well have the observations been checked?
    Field rock descriptions in this data file have not been reviewed for technical content and should be considered preliminary.
  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 reported errors between 10 and 12 m. Latitude and longitude are reported in the WGS84 datum. Locations were converted to NAD83 coordinates to provide consistency with adjacent data.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    This data releaase is complete.
  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)
    State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
    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 (http://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 2023-27
  3. What legal disclaimers am I supposed to read?
    The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services 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, any failure thereof, or otherwise, and 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: 24-Nov-2023
Metadata author:
Simone Montayne
3354 College Road
Fairbanks, AK
USA

907-451-5020 (voice)
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.9.50 on Fri Nov 24 21:11:56 2023