Topographically Occurring Mine Symbols (TOMS) -- Points

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Frequently-anticipated questions:


What does this data set describe?

Title: Topographically Occurring Mine Symbols (TOMS) -- Points
Abstract:
Mining feature symbols digitized from 1:24000 scale, 7.5 minute USGS topographic quadrangles as scanned by the Stephen P. Teale Data Center (July, 1998).
  1. How should this data set be cited?

    California Department of Conser, Office of Mine Reclamation, Abandoned , 20010605, Topographically Occurring Mine Symbols (TOMS) -- Points: Topographically Occurring Mine Symbols (TOMS) Points.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -124.473227
    East_Bounding_Coordinate: -113.473814
    North_Bounding_Coordinate: 42.170724
    South_Bounding_Coordinate: 32.430298

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: unknown
    Ending_Date: 1998
    Currentness_Reference: publication date

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

    Geospatial_Data_Presentation_Form: vector digital data

  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. It contains the following vector data types (SDTS terminology):

      • Entity Point (51336)

    2. What coordinate system is used to represent geographic features?

      The map projection used is Albers Conical Equal Area.

      Projection parameters:
      Standard_Parallel: 34
      Standard_Parallel: 40.5
      Longitude_of_Central_Meridian: -120
      Latitude_of_Projection_Origin: 0
      False_Easting: 0
      False_Northing: -4000000

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 5.0
      Ordinates (y-coordinates) are specified to the nearest 5.0
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1927 (CONUS).
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.978698213898.

  7. How does the data set describe geographic features?

    toms_point.dbf
    Attributes of point mine features as they exist on USGS 7.5-minute (1:24000) topographic quadrangles. (Source: Office of Mine Reclamation)

    ID
    Unique integer identifier. (Source: System)

    Range of values
    Minimum:1
    Maximum:51336
    Resolution:1

    USGSCODE
    Alphanumeric code for each 7.5-minute quadrangle. (Source: USGS)

    Range of values
    Minimum:00000A1
    Maximum:90180Z9

    TYPE
    The type of mining feature as depicted on the 7.5-minute quadrangle. (Source: USGS)

    ValueDefinition
    Asphalt PitAsphalt Pit
    Borrow PitBorrow Pit
    BuildingBuilding
    CaveSometimes used interchangeably with "Mine Tunnel", though typically refers to a natural geologic feature.
    Cinder PitCinder Pit
    Clay PitClay Pit
    ConveyorUsed to represent some type of mining infrastructure for moving mined materials.
    DamDam
    DiggingsArea of surface mined land. Sometimes used to refer to hydraulic mine sites.
    Dredger TailingsWaste material from dredge mining operations.
    ElectricalElectric transmission infrastructure.
    Gravel PitGravel pit mines. The markings are the same as sand, clay and borrow pits.
    Historical MarkerHistorical marker.
    Intricate Surface AreaArea of non-specific surface mined land.
    Lava TubeLava tube
    Mill SiteArea of milling operations.
    Mine DumpUsually used to refer to waste rock.
    Mine ShaftVertical opening to underground mine workings.
    Mine TunnelHorizontal opening to underground mine workings. Commonly used to depict "adits" or "portals".
    Mineral LocationArea where a mineral resource has been identified.
    Open PitSurface mined land. Distinguished from a "Quarry" by a notation on the map.
    OtherUnknown mining feature.
    PipePipe
    Placer DiggingsSee "Diggings"
    Placer TailingsSimilar to "Diggings".
    ProspectArea of mineral exploration.
    QuarrySurface mined area. The point symbol is the same as an "Open Pit".
    Sand PitSurface mined area where the commodity was identified as sand. See also, "Borrow Pit", "Clay Pit" and "Gravel Pit".
    SpringSpring.
    StockpileUsually indicates an ore stockpile.
    Strip MineSurfaced mined area. See also "Intricate Surface Area".
    TailingsWaste material following milling or other processing.
    Tailings PondArea used to deposit mill tailings that were in the form of a slurry.
    TankAny type of tank for holding liquids.
    TramwayAerial conveyor system.
    TrenchA linear excavation.
    TunnelSimilar to "Mine Tunnel", but labeled as a "Tunnel".

    MINENAME
    Name of the mine site as depicted on the 7.5-minute topographic map. Unlabeled sites were designated "Unknown". (Source: USGS)

    Any text.

    CA
    Indicates whether or not the point feature lies within California. "1" means true, "0" means false. (Source: Office of Mine Reclamation)

    ValueDefinition
    0False.
    1True

    dupe_point
    Indicates whether a particular point is a duplicate representation of a given linear or areal feature. Each linear or areal feature has a point representation in each quadrangle it crosses. By selecting all features where "dupe_point" = 0, it is possible to filter out the duplicate point representations. The duplication allows a point representation of linear and areal features to be used both on a landscape and per quad basis. (Source: Office of Mine Reclamation)

    ValueDefinition
    0False.
    1True


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?

    Eric Miller, Jonathan Mistchenko, Sarah Reeves, Mike Tuffly, Consumnes College, Shasta College, University of California at Davis,

  3. To whom should users address questions about the data?

    Office of Mine Reclamation
    c/o Jonathan Mistchenko
    Environmental Scientist
    801 K St., MS 09-06
    Sacramento, CA 95814
    USA

    916-323-9198 (voice)
    916-322-4862 (FAX)
    omr@consrv.ca.gov

    Hours_of_Service: 8-5, M-F


Why was the data set created?

To develop a statewide digital spatial dataset of accurately located mining features. Other digital datasets covering the state are limited to mining operations (or claims) but do not locate physical features resulting from mining.


How was the data set created?

  1. From what previous works were the data drawn?

    trimdrg (source 1 of 1)
    Stephen P. Teale Data Center, 1998, DRG - Digital Raster Graphic, USGS 7.5-minute Quad Images (trimmed): Stephen P. Teale Data Center, Sacramento, CA.

    Type_of_Source_Media: CD-ROM
    Source_Scale_Denominator: 24000
    Source_Contribution:
    All data in the dataset is derived from the 1:24,000 7.5-minute USGS topographic quadrangles. See trimdrg1.txt for source metadata

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

    Date: 2001 (process 1 of 1)
    Each DRG covering a quadrangle was occularly inspected for mining features (as markers, lines or areas). Features were digitized from the DRG's and attributes were completed concurrently. The feature layers for each quadrangle were then merged to form a statewide dataset. Several quality control inspections were undertaken to identify errors of omission, comission and positional errors. Such errors have been corrected where identified.

    Data sources used in this process:

    • trimdrg

  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?

    Ten percent of the quads were sampled for omission and attribute accuracy. From the sampled population, there were approximately ten percent errors on the attributes and ten percent on omission. All found errros were corrected.

  2. How accurate are the geographic locations?

    Positional accuracy is reliant on the accuracy of the original source maps. USGS topographic quadrangles typically state that the maps comply with national map accuracy standards. Human digitization of the mining symbols has likely added slight deviations from the original source map, though no formal method has been undertaken to quantify this additional error.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    Data is statewide in extent. Coverage varies from quadrangle to quadrangle due to revisions of the source maps.

  5. How consistent are the relationships among the observations, including topology?

    Logical consistency was insured by ocular inspection. No specific systematic tests were employed.


How can someone get a copy of the data set?

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

Access_Constraints: None
Use_Constraints: The State of California, Department of Conservation, its employees, agents or contractors make no warranty of any kind, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any of the maps and associated information. The locations and extent of these mine sites have not been confirmed by field investigations. The information is subject to change as more accurate and up-to-date information becomes available. While the Department may update this information from time to time, available resources may prevent the Department from updating this information on a timely basis. The Department therefore does not warrant that this information is the most current and up-to-date information. The user of the information assumes all responsibility for ensuring that they have the most current and accurate information. All maps are designed for use at the designated scale and should not be enlarged or used for making site-specific decisions of any kind. Distribution of this data is intended for informational purposes and should not be considered authoritative or relied upon for navigation, engineering, legal, or other site-specific uses, including but not limited to the obligations of sellers of real property and their disclosure obligations under California law. The Department makes no warranty of any kind, express or implied, nor assumes any legal liability or responsibility for the integration of the information, programs or software into any other personal or private computer system or hardware. The user of this information assumes any and all risks and understands that this information is provided on an “as is” basis. All warranties of any kind, express or implied, including but not limited to the implied warranties of merchantability, fitness for a particular purpose, freedom from contamination computer viruses and non-infringement of proprietary rights are disclaimed.

  1. Who distributes the data set? (Distributor 1 of 1)

    Office of Mine Reclamation
    c/o Jonathan Mistchenko
    Environmental Scientist
    801 K St., MS 09-06
    Sacramento, CA 95814
    USA

    916-323-9198 (voice)
    916-322-4862 (FAX)
    omr@consrv.ca.gov

    Hours_of_Service: 8-5, M-F
  2. What's the catalog number I need to order this data set?

    TOMS

  3. What legal disclaimers am I supposed to read?

    The Department of Conservation makes no warranties as to the suitability of this product for any particular purpose.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 24-Aug-2005
Metadata author:
Office of Mine Reclamation
c/o Eric G. Miller
Research Analyst
801 K St., MS 09-06
Sacramento, CA 95814
USA

916-323-9198 (voice)
omrcal@consrv.ca.gov

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)


Generated by mp version 2.8.6 on Thu Aug 03 13:59:33 2006