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  3. Mineral Resource Data System (MRDS)

Kelsey

Past Producer in El Dorado county in California, United States with commodities Gold, Lead
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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. Geologic structures
  11. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Production statistics
  15. Workings at the site
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10006962
MRDS ID C007866
Record type Site
Current site name Kelsey
Alternate or previous names Lady
Related records 10211283

Geographic coordinates

Geographic coordinates: -120.81602, 38.78296 (WGS84)
Elevation 610
Relative position 1 MI. S OF KELSEY ON N SIDE OF S FORK AMERICAN RIVER

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)

Geographic areas

Country State County
United States California El Dorado

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 011N 010E 24 California

Comments on the location information

  • UTM ACC. SW 1/4 24 NW 1/4 25

Commodities

Commodity Importance
Gold Primary
Lead Tertiary

Comments on the commodity information

  • ORE FROM 1928 - 1931 YIELDED $1.80 TO $6.40 PER TON AU WITH ORE IN LATER YEARS OF LESS VALUE, MOST OF ORE FROM FOOTWALL VEIN

Materials information

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

Analytical data

Result 30 % OF AU RECOVERED AS FREE GOLD, THE REST IS RECOVERED BY SMELTING

Host and associated rocks

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

Nearby scientific data

(1) -120.81602, 38.78296
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Rocks In Area Trend Nw With Much Faulting

Ore body information

  • Depth to top 0M

Controls for ore emplacement

  • Associated With Narrow Bands Of Amphibolite And Serpentine In Slate

Comments on the geologic information

  • IN MARIPOSA SLATE, CROSS SECTION FROM W TO E SHOWS SCHIST FOOTWALL, 6 IN. OF MIXED CARBONATES, 8 FT. OF MINERALIZED GREY SCHIST, 6 FT. OF SLATE RIBBON ROCK WITH MUCH PYRITE AND SOME GALENA AND THEN BLACK MARIPOSA SLATE FOOTWALL.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Production years 1928 - 1931

Production statistics

  • Year 1931
    Period 1928 - 1931
    Accuracy Estimate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 6g/mt

Comments on the production information

  • ACTIVE PRIOR 1915 , 1926 - 1931 , 1934 - 1941 .

Workings at the site

  • Type of workings Underground
    Area 16.997HA
    Length 746.76M

Comments on the workings information

  • DEVELOPED BY A MAIN 1700 FT. N DRIFT ADIT AND 700 FT. N DRIFT ADIT 300 FT. ABOVE MAIN ADIT, CONNECTED BY A RAISE ALSO THERE IS 42 FT. SHAFT NEAR MAIN ADIT PORTAL. SEVERAL FOOTWALL CROSSCUTS ON MAIN ADIT.

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. 418 - 419 , 512 AND PL. 10 .

  • Deposit

    LOGAN, C. A., 1938 , MIN. RESOURCES OF EL DORADO CO.: CALIF. JOUR. OF MINES AND GEOL., VOL. 34 , NO. 3 , PG. 263 AND PL. II.

  • Production

    LOGAN, ( 1935 )

General comments

Subject category Comment text
Deposit VEINS

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1979 Mateik, R.; Albers, John P. U.S. Geological Survey PARSED HOST ROCK AND ASSOCIATED ROCK INFORMATION FROM OLD SINGLE VALUED FIELD TO NEW MULTIVALUED FIELD
Editor 27-APR-1995 Mosier, Dan 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.