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Folsom

Past Producer in Sacramento county in California, United States with commodities Gold, Platinum, Osmium, Iridium
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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. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  15. Ownership information
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10103627
MRDS ID M045265
Record type Site
Current site name Folsom
Alternate or previous names Folsom-Natoma District, American River District, Capital Dredging Co., Natomas Co.

Geographic coordinates

Geographic coordinates: -121.22075, 38.61184 (WGS84)
Elevation 69
Location accuracy 100(meters)
Relative position SOUTH BANK AMERICAN RIVER. 10 MI DOWNSTREAM TO FAIR OAKS FROM FOLSOM TO 6 MI ABOVE FOLSOM

Site location context

Political divisions (FIPS codes)

Sacramento(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Buffalo Creek(quadrangle 1:24,000 scale)

Sacramento(quadrangle 1:100,000 scale)

Sacramento(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower American(hydrologic unit)

Lower Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Sacramento

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 009N 007E California

Comments on the location information

  • TAILINGS ALSO LOCATED IN CARMICHAEL AND CITRUS HEIGHTS QUADRANGLES. LOCATION GIVEN IS NEAR WATER TREATMENT PONDS ON BUFFALO CREEK IN QUADRANGLE BY THE SAME NAME.

Commodities

Commodity Importance
Gold Primary
Platinum Critical Secondary
Osmium Secondary
Iridium Critical Secondary

Materials information

Materials Type of material
Gold Ore

Analytical data

Result AVERAGE OF 5 PGE SAMPLES YIELDED 43.40% PT, 20.81% IR, 30% OS (EST) (LOGAN)

Mineral occurrence model information

Model code 119
USGS model code 39a
Deposit model name Placer Au-PGE
Mark3 model number 54

Host and associated rocks

  • Host or associated Host
    Rock type Unconsolidated Deposit > Gravel
    Rock unit name Laguna Formation (Silt, Sand, Gravel)
    Rock description Laguna Formation (Silt, Sand, Gravel)
    Stratigraphic age (youngest) Pleistocene
    Stratigraphic age (youngest) Holocene
    Stratigraphic age (youngest) Pliocene

Nearby scientific data

(1) -121.22075, 38.61184
ListMap

Economic information

Ore body information

  • General form TABULAR
    Thickness 33.53M
    Length 24139.5M
    Width 11265.1M

Controls for ore emplacement

  • Stream Hydraulics

Comments on the geologic information

  • GRAVELS ARE IN OR ALONG THE AMERICAN RIVER AND NEAR LOWER CONTACTS OF THE LAGUNA AND MEHRTEN FORMATIONS.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Medium
Significant No
Discovery year 1860
Year of first production 1848
Year of last production 1962

Mining district

District name Folsom District

Ownership information

  • Type Operator
    Owner Natomas Co.
    First year 1962

Comments on the production information

  • IN 1958 GRAVELS= 0.0017 OZ/TON AU (58 PPB); 1914-1916 PT= 0.00017 OZ/TON (6 PPB)

Comments on the workings information

  • DREDGING

Reference information

Bibliographic references

  • Deposit

    LOGAN, C.A. 1919, PLATINUM AND ALLIED METALS IN CALIFORNIA: CALIFORNIA STATE MINING BUREAU BULLETIN 85, P. 27-29.

  • Deposit

    CLARK, W.B., 1970, GOLD DISTRICTS OF CALIFORNIA: CALIFORNIA DIVISION OF MINES AND GEOLOGY BULLETIN 193, P. 47-49.

  • Deposit

    CARLSON, D.W., 1955, MINES AND MINERAL RESOURCES OF SACRAMENTO COUNTY, CALIFORNIA: CALIFORNIA JOURNAL OF MINES AND GEOLOGY, V. 51, NO. 2, P. 137, 140-142, 186, PL. 2.

  • Deposit

    CLARK, W.B., 1970, PLATINUM: CALIFORNIA DIVISION OF MINES AND GEOLOGY MINERAL INFORMATION SERVICE, V. 23, NO. 6, P. 115-123.

General comments

Subject category Comment text
Deposit RECORD W017627, W024652, W024654 AND W024643 HAVE BEEN MERGED AND DELETED.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-DEC-74 Blair, Will N. U.S. Geological Survey
Updater 01-JAN-89 Peterson, Jocelyn A. 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.