1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Los Nietos Occurrence

Occurrence in Pecos county in Texas, United States with commodities Zinc, Lead
Map
XML
JSON
KML
B
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. Land status
  16. Links to other databases
  17. Bibliographic references
  18. Reporter information

Geologic information

Identification information

Deposit ID 10065070
MRDS ID TC40067
Record type Site
Current site name Los Nietos Occurrence

Geographic coordinates

Geographic coordinates: -102.65878, 30.95852 (WGS84)
Relative position 14 MILES N70E OF FORT STOCKTON.

Site location context

Political divisions (FIPS codes)

Pecos(county)

Texas(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

East Mesa(quadrangle 1:24,000 scale)

Fort Stockton(quadrangle 1:100,000 scale)

Fort Stockton(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Pecos-Red Bluff Reservoir(hydrologic unit)

Lower Pecos(hydrologic accounting unit)

Lower Pecos(hydrologic subregion)

Rio Grande(hydrologic region)

Federal lands

ST(Federal land areas administered by ST)

Geographic areas

Country State County
United States Texas Pecos

Comments on the location information

  • IN SECTION 11, BLOCK 26, UNIVERSITY LAND SURVEY.

Commodities

Commodity Importance
Zinc Critical Primary
Lead Primary

Comments on the commodity information

  • UP TO 6.6% SPHALERITE, 0.6% GALENA, AND 0.2% CD. NO AG DETECTED IN GALENA. PYRITE HAS UP TO 0.05%CO.

Materials information

Materials Type of material
Galena Ore
Calcite Gangue
Dolomite Gangue
Pyrite Gangue

Alteration

  • (Local) Dolomite Replaces Lower Leonardian Shelf-Margin Reef And Bio-Grainstones. Perhaps An Early (Shallow Burial) Phase Of Fine-To-Medium Crystalline Dolomite And A Late, But Pre-Mineral, (Deep Burial) Phase Of Coarse Crystalline Dolomite And Formation Of Secondary Porosity. A Late (Pre, Syn, And Post Mineral) Phase Of Dolomite And Calcite Cement.

Analytical data

Result TWO-PHASE FLUID INCLUSIONS IN 2 SPHALERITE SAMPLES HAD FILLING TEMPERATURES OF 102-122 DEGREES C AND 70-120 DEGRESS C. ONE GALENA-SPHALERITE PAIR YIELDED AN ESTIMATED FORMATION TEMPERATURE OF 96 +/- 20 DEGREES C FROM SULFUR ISOTOPIC ANALYSIS.

Mineral occurrence model information

Model code 224
USGS model code 32a
Deposit model name Mississippi Valley, S.E. Missouri Pb-Zn
Mark3 model number 42

Host and associated rocks

  • Host or associated Associated
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Shale
    Stratigraphic age (youngest) Early Permian
    Stratigraphic age (youngest) Early Permian
  • Host or associated Associated
    Rock type Sedimentary Rock > Carbonate > Limestone
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Dolomite

Nearby scientific data

(1) Fredericksburg Group
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Paleoshelf Edge
Type of structure Local
Structure description Reef Complex

Ore body information

  • Thickness 21.95M
    Depth to top 1280.16M

Controls for ore emplacement

  • Mineralization Occurs At Contact Between Dolostone And Shale And Non-Porous Limestone Along The Leonardian Reef Edge.

Comments on the geologic information

  • WELL-BOTTOMED OUT IN PRECAMBRIAN CRYSTALLINE ROCK. SULFIDE-BEARING HORIZON OVERLAIN BY 600 FT OF LOCALLY OIL-STAINED DOLOSTONE.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Significant No
Discovery year 1949

Land status

Ownership category Private

Comments on development

  • DISCOVERED IN DRILL CUTTINGS FROM LOS NIETOS 1-B UNIVERSITY OIL AND GAS WELL. DRILLED 1949 TO A TOTAL DEPTH OF 5649 FT. NO ECONOMIC OIL OR GAS FOUND. WELL SUBSEQUENTLY PLUGGED AND ABANDONED.

Reference information

Bibliographic references

  • Deposit

    MAZULLO, S.J., 1986, MISSISSIPPI VALLEY-TYPE SULFIDES IN LOWER PERMIAN DOLOMITES, DELAWARE BASIN, TEXAS: IMPLICATIONS FOR BASIN EVOLUTION: AAPG BULLETIN, V. 70, P. 943-952

  • Other Database

    CIMRI

Reporter information

Type Date Name Affiliation Comment
Reporter 01-DEC-1993 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