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Nopal 1

Occurrence 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. Alteration
  8. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Controls for ore emplacement
  12. Economic information about the deposit and operations
  13. Mining district
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10049494
MRDS ID MX02216
Record type Site
Current site name Nopal 1
Alternate or previous names El Nopal
Related records 10303235

Geographic coordinates

Geographic coordinates: -106.03442, 29.11134 (WGS84)

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

Comments on the location information

  • ESTIMATED TO WITHIN 15 SECONDS.

Commodities

Commodity Importance
Uranium Primary
Molybdenum Tertiary

Comments on the commodity information

  • SOME CHEMICAL ANALYSES INDICATE MO AND PB ENRICHMENT IN THE BRECCIA PIPE.

Materials information

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

Alteration

  • (Local) Argillic

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 Volcanic Rock (Aphanitic) > Glassy Rock > Vitrophyre
    Rock unit name Coloradas Formation;Nopal Formation
    Rock description Coloradas Formation;Nopal Formation
    Stratigraphic age (youngest) Tertiary
    Chronological age 43.8

Nearby scientific data

(1) -106.03442, 29.11134
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Economic information

Controls for ore emplacement

  • Structurally Controlled Between Intersection Of Two Step-Faults, And Confined Stratigraphically To The Nopal And Coloradas Formations.

Comments on the geologic information

  • COLORADAS FORMATION: (FORMERLY NOPAL TUFF MEMBER) SIMPLE COOLING UNIT COMPOSED OF REDDISH LITHIC-CRYSTAL RHYOLITIC IGNIMBRITE WITH A DARK BASAL VITROPHYRE. NOPAL FORMATION: (FORMERLY NOPAL RHYOLITE MEMBER) SIMPLE COOLING UNIT, DISCORDANTLY OVERLYING THE COLORADAS FM., COMPOSED OF A CRYSTALLINE RHYOLITIC IGNIMBRITE WITH A DARK BASAL VITROPHYRE WHICH SHOWS VARIABLE ALTERATION GRADES AND LOCALLY CONTAINS WELL-DEVELOPED GEODES. UNIT HAS BEEN DATED AT 43.8 M.Y.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Pena Blanca

Reference information

Bibliographic references

  • Deposit

    CARDENAS F., D., 1983, VOLCANIC STRATIGRAPHY AND URANIUM DEPOSITS OF CENTRAL SIERRA DE PENA BLANCA, CHIHUAHUA, 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.

  • Deposit

    GUILD, P.W., 1981, PRELIMINARY METALLOGENIC MAP OF NORTH AMERICA: USGS CIRCULAR 858-A,B.

  • Deposit

    CLARK, K.F., AND GOODELL, P.C., (EDS.), 1983, GEOLOGY AND MINERAL RESOURCES OF NORTH-CENTRAL CHIHUAHUA: EL PASO GEOLOGICAL SOCIETY, GUIDEBOOK, 1983 FIELD CONFERENCE, OCT. 7-9, 1983, PLATE 1, SCALE 1:500000.

General comments

Subject category Comment text
Deposit SMALL HIGH-GRADE U-BEARING BRECCIA PIPE-LIKE ORE BODY, SOME OBSERVED COLLAPSE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1988 Leonard, Kenneth R. (Page, Norman J.) U.S. Geological Survey
Updater 01-JUN-1988 Leonard, Kenneth 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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