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Big Branch Area

Past Producer in Gillespie county in Texas, United States with commodity Talc-Soapstone
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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. Mineral occurrence model information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Land status
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10065111
MRDS ID TC40133
Record type Site
Current site name Big Branch Area

Geographic coordinates

Geographic coordinates: -98.60866, 30.44188 (WGS84)
Elevation 427
Relative position 6.5 MI N60E OF WILLOW CITY

Site location context

Political divisions (FIPS codes)

Gillespie(county)

Texas(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Blowout(quadrangle 1:24,000 scale)

Pedernales River(quadrangle 1:100,000 scale)

Llano(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Buchanan-Lyndon B. Johnson Lakes(hydrologic unit)

Middle Colorado-Llano(hydrologic accounting unit)

Lower Colorado-San Bernard Coastal(hydrologic subregion)

Texas-Gulf(hydrologic region)

Geographic areas

Country State County
United States Texas Gillespie

Comments on the location information

  • ON NOLEN ALTHAUS, ALFRED DAVIS, W.O. DAVIS PROPERTIES.

Commodities

Commodity Importance
Talc-Soapstone Primary

Materials information

Materials Type of material
Talc Ore
Calcite Gangue
Chlorite Gangue
Magnetite Gangue

Mineral occurrence model information

Model code 20
USGS model code 8f
Deposit model name Ultramafic hosted magnesite

Host and associated rocks

  • Host or associated Associated
    Rock type Metamorphic Rock > Gneiss
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Associated
    Rock type Plutonic Rock > Pegmatite
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite
  • Host or associated Host
    Rock type Metamorphic Rock > Schist
    Rock unit name Packsaddle Schist
    Rock description Packsaddle Schist

Nearby scientific data

(1) Big Branch Gneiss
ListMap

Economic information

Ore body information

  • General form LENSE
    Length 4425.58M
    Depth to top 0M

Comments on the geologic information

  • SCHISTS CONTAIN MICA, CHLORITE, TREMOLITE AND/OR FELDSPAR. VERMICULITE AND CHLORITE BANDS SOMETIMES OCCUR ALONG TALC LENSE/SCHIST CONTACTS.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Non-metallic
Significant No

Land status

Ownership category Private

Comments on the production information

  • SOME ORE SHIPPED TO A TALC GRINDING PLANT IN LLANO AFTER 1948.

Comments on the reserve resource information

  • ASSUMES SPECIFIC GRAVITY 2.80. A CONSERVATIVE ESTIMATE BASED ON SURFACE DIMENSIONS.

Comments on the workings information

  • 108 TRENCHES.

Comments on development

  • EXPLORED BY TRENCHING 1942 BY WORK PROJECTS ADMINISTRATION.

Reference information

Bibliographic references

  • Deposit

    BARNES, V.E., 1945, SOAPSTONE AND SERPENTINE IN THE CENTRAL MINERAL REGION OF TEXAS, IN TEXAS MINERAL RESOURCES: UNIVERSITY OF TEXAS PUBLICATION 4301, P. 55-91.

  • Deposit

    BARNES, V.E., 1952, GEOLOGIC MAP OF THE BLOWOUT QUADRANGLE, BLANCO, GILLESPIE, AND LLANO COUNTIES, TEXAS: TEXAS BUREAU OF ECONOMIC GEOLOGY GQ-5.

  • Other Database

    CIMRI

General comments

Subject category Comment text
Deposit SOME 600 TALC LENSES IN A N-S BELT LENSES ARE ELLIPSOIDAL, GENERALLY VERTICAL, PITCH 45-60 DEGREES SOUTH, AND HAVE A SURFACE EXPRESSION OF 2 BY 6 TO 80 BY 195 FT. TALC CONTENT RANGES UP TO 68%.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-SEP-1994 Long, Keith R. U.S. Geological Survey

Beyond USGS

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

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