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  3. Mineral Resource Data System (MRDS)

Punta Norte

Past Producer in Baja California, Mexico with commodities Copper, Gold
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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. Host and associated rocks
  8. Nearby scientific data
  9. Ore body information
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10049295
MRDS ID MX00575
Record type Site
Current site name Punta Norte
Alternate or previous names Esperanza

Geographic coordinates

Geographic coordinates: -115.24133, 28.3616 (WGS84)
Relative position 2 KM S OF PUNTA NORTE (N TIP OF CEDROS ISLAND).

Site location context

Political divisions (FIPS codes)

Pima(county)

Arizona(state)

United States(country)

North America(continent)

Land(continent)

Geographic areas

Country State
Mexico Baja California

Comments on the location information

  • ESTIMATED TO WITHIN 15 SECONDS.

Commodities

Commodity Importance
Copper Primary
Gold Primary

Materials information

Materials Type of material
Bornite Ore
Chalcopyrite Ore
Covellite Ore
Gold Ore
Pyrite Ore
Quartz Gangue

Analytical data

Result AVG. GRADE: 0.5-2.0% CU
Result SHIPPED ORE: 13-37% CU.

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
    Stratigraphic age (youngest) Late Jurassic
    Stratigraphic age (youngest) Late Jurassic
    Stratigraphic age (youngest) Late Jurassic
  • Host or associated Host
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Greenstone
    Rock unit name Choyal Formation
    Rock description Choyal Formation

Nearby scientific data

(1) -115.24133, 28.3616
ListMap

Economic information

Ore body information

  • Strike NW
    Dip 70 NE

Comments on the geologic information

  • VOLCANIC ROCKS OF THE CHOYAL FM. (MASSIVE AND PILLOW STRUCTURED VOLCANICS, BRECCIA AND CHERT) HAVE BEEN HYDROTHERMALLY ALTERED IN THE MINE AREA. PLUTONIC ROCKS IN THE AREA INCLUDE TWO LARGE STOCKS RANGING FROM QUARTZ DIORITE TO GRANODIORITE IN COMPOSITION, AN OLDER(?) HORNBLENDE DIORITE DIKE, AND A LATE STAGE GRANOPHYRE DIKE.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1890
Year of last production 1917

Mining district

District name Isla Cedros

Comments on development

  • INTERMITTENT SMALL SCALE MINING: 1890-1917.

Reference information

Bibliographic references

  • Deposit

    WISSER, E., 1954, GEOLOGY AND ORE DEPOSITS OF BAJA CALIFORNIA, MEXICO: ECONOMIC GEOLOGY, V. 49, NO. 1, P. 44-76.

  • Deposit

    KILMER, F.H., 1984, GEOLOGY OF CEDROS ISLAND, BAJA CALIFORNIA, MEXICO: ARCATA, CA, FRANK H. KILMER, 69 P., 1 MAP, SCALE 1:75000. (PRINTED AT HUMBOLDT STATE UNIVERSITY)

General comments

Subject category Comment text
Deposit THREE MINERALIZED SHEETED ZONES. TWO WORKED FOR AURIFEROUS QUARTZ. THIRD ZONE (ESPERANZA ZONE) DEVELOPED FOR 300 FT STRIKE LENGTH, 300 FT DEPTH AND 40 FT WIDTH. ORE: PYRITE WITH CHALCOPYRITE, BORNITE, COVELLITE AND CU-CARBONATES.

Reporter information

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

Beyond USGS

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

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