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Chocolate Drop Group

Producer in Imperial county in California, United States 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. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Links to other databases
  13. Bibliographic references
  14. Reporter information

Geologic information

Identification information

Deposit ID 10109375
MRDS ID M020021
Record type Site
Current site name Chocolate Drop Group
Alternate or previous names Big Bear, Black Jack, Black Queen: Ebony Group.
Related records 10163241

Geographic coordinates

Geographic coordinates: -114.87441, 33.40756 (WGS84)
Relative position W. END OF PALO VERDE MOUNTAINS; 6.5 MI. S. OF WILEY WELL; 32.5 MI. BY ROAD FROM BLYTHE.

Site location context

Political divisions (FIPS codes)

Imperial(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Thumb Peak(quadrangle 1:24,000 scale)

Trigo Mountains(quadrangle 1:100,000 scale)

Salton Sea(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Imperial Reservoir(hydrologic unit)

Lower Colorado(hydrologic accounting unit)

Lower Colorado(hydrologic subregion)

Lower Colorado(hydrologic region)

Federal lands

Bureau of Land Management(Bureau of Land Management CA)

Bureau of Land Management CA BLM(Type of land area)

BLM(Federal land areas administered by BLM)

Geographic areas

Country State County
United States California Imperial

Public Land Survey System information

Meridian Township Range Section Fraction State
San Bernardino 009S 020E 09 California

Comments on the location information

  • GROUP COMPRISES 4 CLAIMS; CHOCOLATE DROP, BLACK QUEEN, BLACK JACK, AND BIG BEAR. THE EBONY GROUP IS THE OLD NAME FOR THE DEPOSITS.; LATITUDE-LONGITUDE VALUES CALCULATED FROM TOWNSHIP, RANGE, SECTION.

Commodities

Commodity Importance
Manganese Critical Primary

Comments on the commodity information

  • ECONOMIC POSSIBILITIES NOT PROMISING BECAUSE OF LOW AVERAGE GRADE OF ORE.

Materials information

Materials Type of material
Psilomelane Ore
Calcite Gangue

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Unconsolidated Deposit > Alluvium
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite

Nearby scientific data

(1) -114.87441, 33.40756
ListMap

Economic information

Ore body information

  • Strike N
    Dip NEAR VERTICAL

Comments on the geologic information

  • GEOL.DESC: THE GROUP CONSISTS OF FISSURE DEPOSITS OF MANGANESE OXIDES (MAINLY HARD, BOTRYOIDAL PSILOMELANE) OCCURRING IN TERTIARY FANGLOMERATE AND, IN ONE PLACE (BLACK JACK) IN ANDESITE. THE FISSURES OCCUR OVER AN AREA HALF A MILE WIDE, STRIKE CLOSE TO NORTH, AND ARE VERTICAL OR STEEPLY DIPPING. BRECCIATED ZONES ALONG THE FISSURES ARE CEMENTED WITH AND PARTIALLY REPLACED BY MANGANESE OXIDE. VEINLETS OF MANGANESE OXIDE AND OF LATER CALCITE CUT FISSURE ZONES. ALTERNATE BANDS OF SOFT BLACK CRYSTALLINE OXIDE ARE PYROLUSITE OR POSSIBLY MANGANITE. THE BLACK JACK CLAIM OCCURS IN ANDESITE WHICH UNDERLIES THE FANGLOMERATE OF THE CHOCOLATE DROP AND BIG BEAR CLAIMS.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Medium
Significant No

Reference information

Bibliographic references

  • Deposit

    D.O.M. BULL. 152 1950 PP. 75 - 76

  • Deposit

    D.O.M. BULL. 125 1943 P. 118

Reporter information

Type Date Name Affiliation Comment
Reporter 01-DEC-1977 Killman, K.; Albers, J. 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

Authoritative California resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.