1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Alhambra

Past Producer in El Dorado county in California, United States with commodity Gold
Map
XML
JSON
KML
B
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. Geologic structures
  11. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10007088
MRDS ID C008253
Record type Site
Current site name Alhambra
Related records 10235903

Geographic coordinates

Geographic coordinates: -120.79102, 38.82518 (WGS84)
Elevation 671
Relative position ON S SIDE OF ROUND HILL, 6 MI SSE OF GEORGETOWN.

Site location context

Political divisions (FIPS codes)

El Dorado(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Garden Valley(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)

Federal lands

Eldorado National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States California El Dorado

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 011N 011E 06,07 California

Comments on the location information

  • UTM ACC CNTR JUNCTION OF SECS

Commodities

Commodity Importance
Gold Primary

Comments on the commodity information

  • TWO HIGH GRADE POCKETS IN 1934 AT 90 FT, AND LARGE POCKET IN 1939 BETWEEN 225 AND 275 FT. LEVEL WORTH APPROX 550,000 , ANOTHER HIGH GRADE ORE POCKET IN 1949 YIELDED 324 OZ. OF AU. AT LEAST 50 % OF OUTPUT OF MINE FROM HIGH GRADE ORE. ORE SHOOT AT FAULT LENSOIDAL AND PLUNGED TO SE.

Materials information

Materials Type of material
Gold Ore
Pyrite Ore
Calcite Gangue
Quartz Gangue

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate
    Rock unit name Mariposa Formation;Mariposa Formation;Mariposa Formation;Mariposa Formation
    Rock description Mariposa Formation;Mariposa Formation;Mariposa Formation;Mariposa Formation

Economic information

Geologic structures

Type of structure Local
Structure description East Of Main Shaft Fault Splits To With Two Branches That Strike Generally To Nw.

Ore body information

  • General form POD-LIKE BODIES
    Strike N 50 W
    Dip NE
    Plunge direction SE
    Depth to top 0M

Controls for ore emplacement

  • Junctions Of Fault Favorable For Localization Of Ore And Maybe Conduit For Gold-Bearing Solutions.

Comments on the geologic information

  • NEAR E. MARGIN OF BELT OF MARIPOSA SLATE, VEIN IN FAULT ZONE AND CONSISTS OF STRINGS OF POD-LIKE BODIES OF QUARTZ IN CHLORITE-SERICITE SCHIST & SLATY SCHIST. SEVERAL SMALLER PARALLEL VEINS IN HANGING WALL. MAIN HANGING WALL AMPHIBOLITE SCHIST, FOOTWALL GRAPHITIC-SERICITE-SCHIST AND SLATE. CALCITE AND SCHISTOSE DIKES ASSOCIATED WITH VEIN.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Production years 1883 , 1886 , 1890 , 1934 - 1942 , 1947

Comments on the workings information

  • DEVELOPED BY 440 FT. INCLINED SHAFT, 75 FT. SHAFT 600 FT. TO SE. THERE ARE 3000 FT. OF DRIFTS AND CROSSCUTS WITH MAIN LEVELS AT 125,225 , AND 400 FT. LEVELS WITH WINZE ON 400 FT. LEVEL TO ORE SHOOT ON 485 FT. SUB-LEVEL.

Reference information

Bibliographic references

  • Deposit

    CLARK, W. B., AND CARLSON, D. W., 1956 , MINES AND MINERAL RESOURCES OF EL DORADO CO., CALIF.: CALIF. JOUR. OF MINES AND GEOL., VOL 52 , NO. 4 , PG. 402 - 405 , 484 .

  • Deposit

    LOGAN, C. A., 1935 , MOTHER LODE GOLD BELT OF CALIF.: CALIF. DIV. MINES BULL. 108 , PL. 2 .

  • Deposit

    LOGAN, C. A., 1938 , MIN. RESOURCES OF EL DORADO CO.: CALIF. JOUR. OF MINES AND GEOL., VOL. 34 , NO. 3 , PG. 258 .

  • Production

    CLARK & CARLSON 1956

General comments

Subject category Comment text
Deposit VEIN

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1979 Mateik, R.; Albers, John P. U.S. Geological Survey HOST ROCK CORRECTED, UNIT NAME
Updater 02-OCT-1991 Mosier, Dan U.S. Geological Survey AND AGE ENTERED. ASSOCIATED ROCK TYPE
Editor 27-APR-1995 Mosier, Dan U.S. Geological Survey AND AGE CHECKED.

Beyond USGS

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

External references

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.