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Presidio Mine

Past Producer in Presidio county in Texas, United States with commodities Silver, Lead, Gold, Zinc, 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. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Land status
  17. Ownership information
  18. Production statistics
  19. Reserves and resources
  20. Workings at the site
  21. Links to other databases
  22. Bibliographic references
  23. General comments
  24. Reporter information

Geologic information

Identification information

Deposit ID 10085715
MRDS ID W701346
Record type Site
Current site name Presidio Mine
Alternate or previous names Shafter
Related records 10178758

Geographic coordinates

Geographic coordinates: -104.32938, 29.813 (WGS84)
Elevation 1265
Relative position 2 MI (2 KM) W OF SHAFTER

Site location context

Political divisions (FIPS codes)

Presidio(county)

Texas(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Shafter(quadrangle 1:24,000 scale)

Presidio(quadrangle 1:100,000 scale)

Presidio(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Cibolo-Red Light(hydrologic unit)

Rio Grande-Amistad(hydrologic accounting unit)

Rio Grande-Amistad(hydrologic subregion)

Rio Grande(hydrologic region)

Geographic areas

Country State County
United States Texas Presidio

Comments on the location information

  • IN SECTIONS 5 AND 8, BLOCK 8, HOUSTON AND CENTRAL TEXAS RR SURVEY.

Commodities

Commodity Importance
Silver Primary
Lead Primary
Gold Primary
Zinc Critical Primary
Manganese Critical Tertiary

Comments on the commodity information

  • ORE WAS LARGELY OXIDIZED.

Materials information

Materials Type of material
Anglesite Ore
Argentite Ore
Cerargyrite Ore
Chalcopyrite Ore
Chrysocolla Ore
Covellite Ore
Descloizite Ore
Endlichite Ore
Galena Ore
Hemimorphite Ore
Iron Ore
Plumbojarosite Ore
Pyrite Ore
Sphalerite Ore
Calcite Gangue
Dolomite Gangue
Quartz Gangue

Alteration

  • (Local) Dolomitization And Silicification Of Limestone; Kaolinite-Calcite-Pyrite In Tertiary Dike Rocks

Analytical data

Result AVERAGE GRADE OF ORE 1909: 21.64 OZ/ST AG, 0.5% PB, 2.5% ZN, 4.5% FE
Result IN 1929: 19.741 OZ/ST AG, 0.02 OZ/ST AU, 2.499% PB, 4.87% ZN, 3.87% FE, 0.38% MN
Result COMPOSITE ORE SAMPLE 1934: 21.11 OZ/ST AG, 0.01 OZ/ST AU, 1.87% PB, 4.7% ZN, 4.7% FE.

Mineral occurrence model information

Model code 72
USGS model code 19a
Deposit model name Polymetallic replacement
Mark3 model number 47

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock unit name Mina Grande Formation;Presidio
    Rock description Mina Grande Formation;Presidio

Nearby scientific data

(1) -104.32938, 29.813
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Doming Of Host Carbonates.

Ore body information

  • General form BLANKET, PINCH AND SWELL
    Depth to top 0M

Controls for ore emplacement

  • Replacement Of Favorable Beds Adjacent To Normal Faults.

Comments on the geologic information

  • MINOR AMOUNTS OF ORE OCCUR IN LIMESTONES OF THE CRETACEOUS PRESIDIO FORMATION. VERTICAL ZONATION POSSIBLY IS SUCH THAT SILVER IS SHALLOW AND LEAD IS DEEP. DISTRICTWIDE ZONING OCCURS WITH HIGHER BASE-METAL-TO-SILVER RATIOS TO THE WEST, AWAY FROM THE PRESIDIO MINE. ZINC CONTENT OF THE ORE WAS PERHAPS 2.5 TO 5%, AND LEAD CONTENT WAS APPROXIMATELY 1.5%.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Medium
Significant No
Discovery year 1880
Discoverer John Spencer Or Mexicans Who Worked For Him.
Year of first production 1883
Year of last production 1942
Production years 1883-1930; 1934-1942.

Mining district

District name Shafter Silver District

Land status

Ownership category Private

Ownership information

  • Type Owner-Operator
    Owner American Metal Co. Of Texas
    First year 1942

Production statistics

  • Year 1912
    Period 1885-1912
    Material ORE
    Accuracy Accurate
    Description Cp_Grade: ^ Plus 5,900 Oz Au And More Than 8000 Lbs Pb.
  • Year 1926
    Period 1913-1926
    Material ORE
    Accuracy Accurate
    Description Cp_Grade: ^25.84 Oz/St Ag (81.68% Recovery)
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Silver Silver 730g/mt
  • Year 1929
    Period 1885-1929
    Material ORE
    Accuracy Accurate
    Description Cp_Grade: ^12.00 Oz/St Ag (83.66% Recovery)
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Silver Silver 339g/mt
  • Year 1938
    Period 1885-1938
    Material ORE
    Accuracy Accurate
    Description Cp_Grade: ^17.88 Oz/St Ag (83.77% Recovery)
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Silver Silver 505g/mt
  • Year 1942
    Period 1883-1942
    Material ORE
    Accuracy Estimate
    Description Cp_Grade: ^15.4 Oz/St Ag (84.4% Recovery)
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Silver Silver 435g/mt

Comments on the production information

  • FROM 1927-1930 ORE CONTAINED $0.40/ST IN AU AND 2% PB.

Reserves and resources

  • Type In-situ
    Estimate year 1979
    Total resources 4000mt ore
    Commodity Subtype Grade units Group Importance Year
    Silver Ag 141.178 g/mt Silver Major 1979

Comments on the reserve resource information

  • MINIMUM ESTIMATE

Workings at the site

  • Type of workings Underground
    Overall depth 289.56M
    Overall length 1219.2M
    Overall width 457.2M

Comments on development

  • UNDER ACTIVE EXPLORATION 1977-1983 BY GOLDFIELDS MINING CO. ; ECON.COM: ORES PROCESSED IN A 50 TPD PAN-AMALGAMATION MILL FROM 1888 TO 1913 WHEN REPLACED BY A 200 TPD CYANIDE PLANT. MINE CLOSED DUE TO DECLINING ORE GRADES AND INCREASED FLOODING.

Reference information

Bibliographic references

  • Deposit

    PRICE, J. G., HENRY, C. D., AND STANDEN, A. R., 1983, ANNOTATED BIBLIOGRAPHY OF MINERAL DEPOSITS IN TRANS-PECOS TEXAS: BUREAU OF ECONOMIC GEOLOGY (TEXAS), MINERAL RESOURCE CIRCULAR NO. 73, 108 P.

  • Deposit

    ROSS, CLYDE P., 1943, GEOLOGY AND ORE DEPOSITS OF THE SHAFTER MINING DISTRICT, PRESIDIO COUNTY, TEXAS: USGS BULL. 928-B, 125P.

  • Deposit

    TWO MONTHS OF FIELD INVESTIGATIONS IN 1934 BY CLYDE P. ROSS, W.E. CARTWRIGHT, AND C.H. COLDWELL UNDER ALLOTMENT FROM THE PUBLIC WORKS ADMINISTRATION

  • Other Database

    CIMRI

  • Production

    PRICE AND OTHERS, 1983; MINES HANDBOOK

  • Reserve-Resource

    USGS OFR 92-002, P. 18.

General comments

Subject category Comment text
Deposit MANTOS IN A ZONE TRENDING ROUGHLY N60E; VEINS ALONG STEEPLY DIPPING NORMAL FAULTS THAT TREND N50-80W, AND ALTERED IGNEOUS DIKES. MANTO OREBODIES WERE DIFFICULT TO FIND, HENCE THE OVERALL EXTENT OF THE OREBODY IS GREATER THAN THAT INDICATED BY THE WORKINGS WHICH WERE LIMITED IN DEPTH BY FLOODING.
Deposit Discovery Year: 1880 OR 1881

Reporter information

Type Date Name Affiliation Comment
Reporter 01-DEC-1990 Paidakovich, Matthew E. 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.

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