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Griffy Mn Prospect

Occurrence in Llano county in Texas, United States with commodity Manganese
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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. 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 10065156
MRDS ID TC40193
Record type Site
Current site name Griffy Mn Prospect
Alternate or previous names Horse Mountain

Geographic coordinates

Geographic coordinates: -98.67589, 30.8352 (WGS84)
Location accuracy 100(meters)
Relative position 5.2 MI N5W OF LLANO, Est, Within 2 Sec

Site location context

Political divisions (FIPS codes)

Llano(county)

Texas(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Llano North(quadrangle 1:24,000 scale)

Llano(quadrangle 1:100,000 scale)

Llano(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Llano(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 Llano

Comments on the location information

  • ON SE FLANK OF HORSE MOUNTAIN.

Commodities

Commodity Importance
Manganese Critical Primary

Materials information

Materials Type of material
Piedmontite Ore
Spessartite Ore
Feldspar Gangue
Magnetite Gangue
Quartz Gangue

Alteration

  • (Local) Exposures Of Mn Silicates Oxidized To Black Oxides.

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss
    Rock unit name Valley Spring Gneiss
    Rock description Valley Spring Gneiss
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic

Nearby scientific data

(1) -98.67589, 30.8352
ListMap

Economic information

Ore body information

  • General form LENSE
    Strike N11W
    Dip 20 TO 40 SW

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Significant No

Land status

Ownership category Private

Comments on the production information

  • INACTIVE PROSPECT

Comments on the reserve resource information

  • ONE ORE SAMPLE CONTAINED 25% MN, 3% FE, 36% SIO2. 8.5% CAO AND NO P.

Comments on the workings information

  • TWO PITS, SOUTHERN PIT IS 15 FT LONG ON STRIKE AND 12 FT WIDE ON DIP EXPOSING ABOUT 2 FT MN OXIDE. A SECOND PIT 90 FT NORTH EXPOSES MUCH LEANER MATERIAL.

Reference information

Bibliographic references

  • Deposit

    PAIGE, S., 1912, GEOLOGIC ATLAS OF THE UNITED STATES LLANO-BURNET FOLIO, TEXAS: USGS FOLIO 183, 16 P

  • Other Database

    CIMRI

General comments

Subject category Comment text
Deposit MAIN LENSE IS ON EAST SLOPE OF HORSE MOUNTAIN, IS TRACEABLE 400 YDS ALONG SLOPE, DISCONTINUOUS WITH MAXIMUM THICKNESS OF 2 FT, LOCALLY THINNING OUT OR BECOMING DISSEMINATED MN SILICATES ARE ASSOCIATED WITH QUARTZ VEINS AND DISSEMINATED MAGNETITE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-SEP-94 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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