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Eureka Claim

Past Producer in Baja California Sur, Mexico with commodity 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. Mineral occurrence model information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Controls for ore emplacement
  11. Economic information about the deposit and operations
  12. Production statistics
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10049266
MRDS ID MX00540
Record type Site
Current site name Eureka Claim
Alternate or previous names Isla San Marcos

Geographic coordinates

Geographic coordinates: -112.08401, 27.20027 (WGS84)

Site location context

Political divisions (FIPS codes)

Baja California Sur(province)

Mexico(country)

North America(continent)

Land(continent)

Geographic areas

Country State
Mexico Baja California Sur

Comments on the location information

  • ESTIMATED TO WITHIN 1 KM.

Commodities

Commodity Importance
Manganese Critical Primary

Materials information

Materials Type of material
Psilomelane Ore
Pyrolusite Ore

Analytical data

Result BEST ORE: 25-35% MN

Mineral occurrence model information

Model code 242
USGS model code 34b
Deposit model name Sedimentary Mn

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Sandstone
    Stratigraphic age (youngest) Pliocene

Nearby scientific data

(1) -112.08401, 27.20027
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Economic information

Controls for ore emplacement

  • Fracture Contolled(?).

Comments on the geologic information

  • MANGANESE DEPOSITS OCCUR IN SMALL MESA FORMED OF FLAT-LYING FOSSILIFEROUS CALCAREOUS SANDSTONE AND CONGLOMERATE WHICH UNCONFORMABLY OVERLIES TUFF, CONGLOMERATE, AND INTERCALATED GYPSUM BEDS CORRELATED WITH THE LOWER PLIOCENE BOLEO FM.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1942

Production statistics

  • Year 1943
    Period -1943
    Material ORE MN
    Accuracy Estimate
    Description Cp_Grade: ^25% Mn
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Manganese Manganese 25wt-pct

Reference information

Bibliographic references

  • Deposit

    TRASK, P.D. AND RODRIGUEZ C., J. JR., 1948, MANGANESE DEPOSITS OF MEXICO: U.S.G.S. BULLETIN 954-F, P. 228-238, 293-295, TABLE 17

  • Production

    TRASK AND RODRIGUEZ, 1948.

General comments

Subject category Comment text
Deposit SOFT, CRYSTALLINE PYROLUSITE AND HARD, BOTRYOIDAL PSILOMELANE IN VEINLETS, NODULES, AND IRREGULAR MASSES IN UPPERMOST 0.5 TO 1.0 METER OF FOSSILIFEROUS LIMESTONE BED. LOCALLY, MOLDS AND CASTS OF FOSSILS HAVE BEEN REPLACED BY MN OXIDES. OCCURRENCES ARE SCATTERED OVER AREA 400 M LONG AND 25-100 M WIDE. INDIVIDUAL CONCENTRATIONS OF ORE RARELY EXCEED 10 M IN LENGTH OR 1 M IN WIDTH.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-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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