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Margaritas Las

Past Producer in Chihuahua, Mexico with commodities Uranium, Molybdenum
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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. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10049493
MRDS ID MX02215
Record type Site
Current site name Margaritas Las
Related records 10206026

Geographic coordinates

Geographic coordinates: -106.06831, 29.12134 (WGS84)
Location accuracy 1000(meters)
Relative position Estimated Location Within +/-30 Sec.

Site location context

Political divisions (FIPS codes)

Pima(county)

Arizona(state)

United States(country)

North America(continent)

Land(continent)

Geographic areas

Country State
Mexico Chihuahua

Commodities

Commodity Importance
Uranium Primary
Molybdenum Secondary

Comments on the commodity information

  • NEW MINERAL SPECIES "MARGARITASITE", A CESIUM CARNOTITE, DESCRIBED BY WENRICH, ET AL (1981). UNSURE ABOUT MOLYBDENUM ABUNDANCE.

Materials information

Materials Type of material
Carnotite Ore
Powellite Ore
Uranophane Ore
Weeksite Ore

Analytical data

Result MEAN GRADE: 0.1% U3O8 AND 0.09% MO.

Mineral occurrence model information

Model code 155
USGS model code 25f
Deposit model name Volcanogenic U

Host and associated rocks

  • Host or associated Associated
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Lake Sediments
    Stratigraphic age (youngest) Oligocene
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Lake Sediments

Nearby scientific data

(1) -106.06831, 29.12134
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Deposit Appears To Have Formed In A Small Basin In Pre-Existing Reef Limestones.

Ore body information

  • General form STOCKWORK"
  • General form STOCKWORK"

Controls for ore emplacement

  • Structurally Controlled By Series Of Subertical N-S Trending Step Faults. Stratigraphically Confined To Escuadra Fm And Laharic Basal Member Of Chontes Conglomerate.

Comments on the geologic information

  • ESCUADRA FORMATION (DATED AT 38 M.Y.): SIMPLE COOLING UNIT CONSISTING OF CRYSTALLINE RYHOLITIC IGNIMBRITE, UNCONFORMABLY OVERLYING PILONCILLOS FANGLOMERATE AND IN DIRECT CONTACT WITH NOPAL FORMATION WHERE PILONCILLOS UNIT IS ABSENT. CHONTES CONGLOMERATE: THICK SEQUENCE OF POLYMICTIC CONGLOMERATES AND CROSSBEDDED RED SANDSTONE LENSES WITH 2-3 M THICK LAHARIC UNIT AT BASE, UNCONFORMABLY OVERLYING ESCUADRA FM. LAHARIC MEMBER CONTAINS ECONOMIC U MINERALIZATION, AND IS THE UNIT IN WHICH THE MINERAL SPECIES "MARGARITASITE" WAS ORIGINALLY DESCRIBED.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Pena Blanca

Comments on the workings information

  • DEPOSIT HAS BEEN DEVELOPED IN PREPARATION FOR OPEN-PIT MINING. SOME FIRST PRODUCTION STORED AT MILLSITE.

Reference information

Bibliographic references

  • Deposit

    CARDENAS, F.D., 1983, VOLCANIC STRATIGRAPHY AND URANIUM DEPOSITS OF CENTRAL SIERRA DE PENA BLANCA, CHIHUAHUIHA, MEXICO, IN GEOLOGY AND MINERAL RESOURCES OF NORTH-CENTRAL CHIHUAHUA; GUIDEBOOK FOR THE 1983 FIELD CONFERENCE: EL PASO TEXAS, EL PASO GEOLOGICAL SOCIETY, P. 325-334

  • Other Database

    CIMRI

General comments

Subject category Comment text
Deposit STOCKWORK-LIKE ORE BODY CONFINED IN THE ESCUADRA FORMATION AND THE LAHARIC MEMBER OF THE CHONTES CONGLOMERATE. MINERALIZATION OBSERVED FILLING FRACTURES, JOINTS AND FAULTS. DISSEMINATED ZONES WITH HEXAVALENT MINERALS FILLING VOIDS IN ALTERED FELDSPAR PHENOCRYSTS. VERTICAL ZONATION CONSISTS OF MO ENRICHMENT UPWARDS AND DOWNWARD U ENRICHMENT. SOME STRATIFORM ENRICHED U ORE BODIES PRESENT AT THE TOP OF THE LAHARIC MEMBER OF THE CHONTES FM.
Deposit ECONOMIC MINERALIZATION WAS EXPLOITED DURING THE LATE 1950'S FROM REEF LIMESTONES OF THE domatilla DEPOSIT ADJACENT TO THE MARGARITAS MINE. ; INFO.SRC : 1 PUB LIT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-88 Leonard, Kenneth R. (Page, Norman J.) U.S. Geological Survey
Updater 01-NOV-93 Staude, John-Mark G. U.S. Geological Survey

Beyond USGS

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

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