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Eagle Mountains Fluorspar District

Past Producer in Hudspeth county in Texas, United States with commodity Fluorine-Fluorite
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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. Geologic structures
  11. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  15. Land status
  16. Ownership information
  17. Reserves and resources
  18. Workings at the site
  19. Links to other databases
  20. Bibliographic references
  21. Reporter information

Geologic information

Identification information

Deposit ID 10069394
MRDS ID W006906
Record type Site
Current site name Eagle Mountains Fluorspar District
Alternate or previous names Eagle Spring, Lucky Strike, Spar Valley, Tank Canyon, Syphon Canyon, Oak, Fox, Rocky Ridge

Geographic coordinates

Geographic coordinates: -105.05885, 30.93351 (WGS84)
Elevation 1600
Relative position ABOUT 27 KM. SOUTHWEST OF VAN HORN, TEXAS

Site location context

Political divisions (FIPS codes)

Hudspeth(county)

Texas(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Eagle Mountains NE(quadrangle 1:24,000 scale)

Indian Hot Springs(quadrangle 1:100,000 scale)

Marfa(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Salt Basin(hydrologic unit)

Rio Grande Closed Basins(hydrologic accounting unit)

Rio Grande Closed Basins(hydrologic subregion)

Rio Grande(hydrologic region)

Geographic areas

Country State County
United States Texas Hudspeth

Comments on the location information

  • DEPOSITS ARE IN BLOCK 68, TOWNSHIP 9, SECTIONS 8, 9, 26, 35-38, 44-48 AND IN TOWNSHIP 10, SEC. 2. DEPOSITS INCLUDE EAGLE SPRING, SEC. 27, LUCKY STRIKE, SPAR VALLEY (NORTH ORE BODY, SOUTH ORE BODY, RHYOLITE VEIN, SHAFT 4), TANK CANYON CLAIMS, SYPHON CANYON CLAIM, DEPOSITS IN SECS. 37 AND 48, OAK CLAIM 4, FOX CLAIM 4, FOX CLAIM 1, 3 AND SEC. 45, ROCKY RIDGE AND FOX CLAIMS 9 AND 10.

Commodities

Commodity Importance
Fluorine-Fluorite Critical Primary

Materials information

Materials Type of material
Fluorite Ore
Ankerite Gangue
Calcite Gangue
Hematite Gangue
Limonite Gangue
Pyrite Gangue
Quartz Gangue
Smithsonite Gangue

Analytical data

Result SPAR VALLEY NORTH REPLACEMENT BODY (NORTH END) WAS 58% CAF2, 32% SIO2, 9% CACO3. RHYOLITE VEIN AVERAGES 57% CAF2, 32% SIO2 - SHAFT 4 AVERAGED 51% CAF2. (E. GILLERMAN, 1953)

Mineral occurrence model information

Model code 238
USGS model code 32m
Deposit model name Manto fluorite

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Syenite
    Stratigraphic age (youngest) Oligocene
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Rock unit name Rhyolite Flows, Sills, Dikes;Eagle Peak Syenite
    Rock description Rhyolite Flows, Sills, Dikes;Eagle Peak Syenite
  • Host or associated Associated
    Rock type Plutonic Rock
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock unit name Grayson Formation-Reef L.S. Member;Finlay L.S.;Bluff Mesa Formation L.S
    Rock description Grayson Formation-Reef L.S. Member;Finlay L.S.;Bluff Mesa Formation L.S

Nearby scientific data

(1) -105.05885, 30.93351
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Mexican Overthrust, Van Horn Dome, Eagle Mountain Syncline
Type of structure Local
Structure description Devil Ridge Thrust Fault

Ore body information

  • General form LINEAR, TABULAR, MANTO
    Dip 42 DEG SW

Controls for ore emplacement

  • Fissure Veins Occur In East Trending Or Nearby Ne-Trending Faults. Replacement Deposits - Rocky Ridge Area Associated With Ne - Trending Faults; Deposits In Sections 37 And 48 Associated With The East - Trending Wind Canyon Fault; Spar Valley North And South Ore Bodies Associated With East Trending Rhyolite Fault And Bounded By Mine Fault. Most Faults Are Normal.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Non-metallic
Deposit size Small
Significant No
Discovery year 1919
Discoverer J. A. Mc Donald
Year of first production 1942

Mining district

District name Eagle Mountains Fluorspar District

Land status

Ownership category Private

Ownership information

  • Type Owner-Operator
    Owner Texas Fluorspar Mines, Inc.
  • Type Owner
    Owner Trepannier, J. J. (Eagle Spring Deposits)
  • Type Owner
    Owner Sanchez, F. (Tank Canyon Deposits)

Comments on the production information

  • MOST OF THE PRODUCTION WAS FROM THE NORTH ORE BODY IN SPAR VALLEY.

Reserves and resources

  • Type In-situ
    Estimate year 1953
    Total resources 100000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Fluorine-Fluorite CaF2 30 wt-pct Fluorine Major 1953

Workings at the site

  • Type of workings Surface/Underground
    Length 188M
    Overall depth 60M

Comments on the workings information

  • SPAR VALLEY NORTH WORKINGS CONSISTS OF A 60 M. SHAFT AND OVER 100 M. OF DRIFTS. THE REPLACEMENT BODY DIPS 40-45 DEG SW AND IS BOUNDED ON THE SOUTH BY THE MINE FAULT ABOUT 60 M. DOWNDIP FROM THE OUTCROP AREA. THE RHYOLITE VEIN HAS BEEN TRACED OVER 60 M. ON THE SURFACE WHERE IT IS 1.4 M. WIDE. AT THE 25 M. AND 45 M. LEVELS, VEIN WIDTH IS ONLY 60 CM. DRIFTS TOTAL 88 M. IN LENGTH.

Reference information

Bibliographic references

  • Deposit

    DENNIS, W.E., 1946, EXPLORATION OF EAGLE MOUNTAIN FLUORSPAR DEPOSITS, HUDSPETH COUNTY, TEXAS: U.S. BU MINES REP. INV. 3878, 11 P.

  • Deposit

    GILLERMAN, E., 1953, FLUORSPAR DEPOSITS OF THE EAGLE MOUNTAINS, TRANS-PECOS TEXAS: USGS BULL. 987, 98 P.

  • Deposit

    1943 DIREXPL U.S. BU MINES

  • Deposit

    1947 GEOLMAP E. GILLERMAN

  • Other Database

    CIMRI

  • Production

    GILLERMAN, E., 1953, USGS BULL. 987, 98 P.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1975 Schruben, Paul G. U.S. Geological Survey
Updater 01-AUG-1992 Long, Keith R. U.S. Geological Survey

Beyond USGS

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

Maps centered on this site