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Alderson

Occurrence in El Dorado 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. Host and associated rocks
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Ownership information
  11. Links to other databases
  12. Bibliographic references
  13. Reporter information

Geologic information

Identification information

Deposit ID 10030182
MRDS ID M008169
Record type Site
Current site name Alderson

Geographic coordinates

Geographic coordinates: -120.77852, 38.71907 (WGS84)
Relative position 1 1/2 MI. SE OF PLACERVILLE.

Site location context

Political divisions (FIPS codes)

El Dorado(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Placerville(quadrangle 1:24,000 scale)

Placerville(quadrangle 1:100,000 scale)

Sacramento(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

South Fork American(hydrologic unit)

Lower Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California El Dorado

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 010N 011E 16,17 California

Commodities

Commodity Importance
Manganese Critical Tertiary

Analytical data

Result ORE GRADE UP TO 26 PERCENT MANGANESE

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Pliocene
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Sandstone

Nearby scientific data

(1) -120.77852, 38.71907
ListMap

Economic information

Comments on the geologic information

  • GEOL.DESC: ZONE OF ARKOSIC SANDSTONE 150 FT. LONG AND CEMENTED BY BLACK MANGANESE OXIDE. ASSAYS YIELD AS HIGH AS 25.9 PERCENT METALLIC MANGANESE. THE SANDSTONE OCCURS IN FLAT LYING TERTIARY VOLCANICS AND IS INTERBEDDED WITH RHYOLITE TUFF BELOW AND AN ANDESITIC AGGLOMERATE ABOVE.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Significant No

Ownership information

  • Type Operator
    Owner Albert Earl Harris

Comments on the production information

  • NO RECORD OF ANY PRODUCTION. ASSAYS AS HIGH AS 25 PERCENT MANGANESE.

Reference information

Bibliographic references

  • Deposit

    CALIF. JOUR. MINES & GEOL. V. 52, NO. 4, P. 575, PL. 10

  • Deposit

    D.O.M. BULL. 152 1950 P. 51

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1972 Gere, W. U.S. Geological Survey
Updater 01-APR-1977 Von Dohlen, E.; 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.