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Mascot - Jefferson City District

Producer in Knox county in Tennessee, United States with commodity Zinc
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Economic information about the deposit and operations
  13. Mining district
  14. Production statistics
  15. Links to other databases
  16. Bibliographic references
  17. Reporter information

Geologic information

Identification information

Deposit ID 10084093
MRDS ID W101058
Record type Site
Current site name Mascot - Jefferson City District

Geographic coordinates

Geographic coordinates: -83.56489, 36.08203 (WGS84)
Location accuracy 10000(meters)

Site location context

Political divisions (FIPS codes)

Jefferson(county)

Tennessee(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

New Market(quadrangle 1:24,000 scale)

Morristown(quadrangle 1:100,000 scale)

Johnson City(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Holston(hydrologic unit)

French Broad-Holston(hydrologic accounting unit)

Upper Tennessee(hydrologic subregion)

Tennessee(hydrologic region)

Geographic areas

Country State County
United States Tennessee Knox
United States Tennessee Jefferson
United States Tennessee Grainger

Comments on the location information

  • The Mascot - Jefferson City District is an area about 1200 km2 in the Valley and Ridge province of eastern Tennessee.

Commodities

Commodity Importance
Zinc Critical Primary

Materials information

Materials Type of material
Sphalerite Ore
Pyrite Ore
Marcasite Ore
Dolomite Gangue
Quartz Unknown
Galena Unknown
Chalcopyrite Unknown
Fluorite Unknown
Calcite Unknown
Anhydrite Unknown
Gypsum Unknown

Alteration

  • (Local) Dolomitization

Mineral occurrence model information

Model code 228
USGS model code 32b
Deposit model name Mississippi Valley, Appalachian Zn
Mark3 model number 42

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate
    Rock unit name Kingsport Formation
    Rock description Kingsport Formation
    Stratigraphic age (youngest) Early Ordovician
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate
    Rock unit name Mascot Formation
    Rock description Mascot Formation
    Stratigraphic age (youngest) Early Ordovician

Nearby scientific data

(1) -83.56489, 36.08203
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Brecciation

Comments on the geologic information

  • Most of the economic Mississippi Valley Type (MVT) mineralization comes from units near the contact between the Kingsport and Mascot Formations. The Kingsport Formation is limestone and dolostone; mineralization is hosted in the upper part of the formation. The Mascot Formation is primarily cherty dolostones; mineralization is in the lower part of the formation (Symons and Stratakos, 2002).
  • Mineralization fills spaces around clasts as cement in breccia bodies. The breccia bodies are discordant and can be up to several though meters long, up to a few hundred meters wide, and more than 150 meters high. The major ore is sphalerite. Recent paleomagnetic dating suggests that regional dolomitization was mid-Mississippian (334 +/- 14 Ma) and hydrothermal mineralization was early Pennsylvanian (316 +/- 8 Ma) (Symons and Stratakos, 2002). Based on their dating, the interpretation of Symons and Strakos (2002) is that dolomitization of the Knox Group occurred as part of a continuum during about 20 MA prior to and during peak Alleghanian deformation, with mineralization formed from hydrothermal fluid flow following peak deformation.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Large
Significant Yes

Mining district

District name Mascot - Jefferson City District

Production statistics

  • Year 1998
    Material zinc ore
    Ore mined 55750mt
  • Year 1999
    Material zinc ore
    Ore mined 59240mt

Comments on the production information

  • The New Market Mine suspended operation in 1996. Asarco suspended operation in the last three active mines in the Jefferson City - Mascot district , the Coy, Immel, and Young mines, in 2001. Production numbers are from Asarco and are for all three mines combined.

Reference information

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JAN-73 Whitlow, S. U.S. Geological Survey
Updater 20-NOV-03 Woodruff, Laurel G. U.S. Geological Survey Work done in Filemaker

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

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