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Michigan Bar

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. Land status
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10038018
MRDS ID M045271
Record type Site
Current site name Michigan Bar
Alternate or previous names Cosumnes River
Related records 10285730

Geographic coordinates

Geographic coordinates: -121.09103, 38.49212 (WGS84)
Elevation 50
Location accuracy 100(meters)
Relative position ABOUT 22 MI EAST OF SACRAMENTO, Accurate Within Dredge Area

Site location context

Political divisions (FIPS codes)

Sacramento(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Carbondale(quadrangle 1:24,000 scale)

Lodi(quadrangle 1:100,000 scale)

Sacramento(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

San Joaquin(hydrologic accounting unit)

San Joaquin(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 007N;008N 008E;008E California

Comments on the location information

  • BETWEEN BRIDGE HOUSE AND MICHIGAN BAR. LOCATION GIVEN IS AT BRIDGE HOUSE RIVER CROSSING

Commodities

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

Materials information

Materials Type of material
Gold Ore

Analytical data

Result PGE SAMPLE YIELDED 44.75% PT, 24.84% IR, 21.72% OS, 8.69% RH (MERTIE, TABLE 40)
Result PGE SAMPLE YIELDED 33.3% PT, 41.97% OS+IR, 18.88% IR, 13.58% AU (LOGAN, P. 109)

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 Ione Formation
    Rock description Ione Formation
    Stratigraphic age (youngest) Eocene
    Stratigraphic age (youngest) Eocene

Nearby scientific data

(1) -121.09103, 38.49212
ListMap

Economic information

Ore body information

  • General form STREAM SEDIMENT DEPOSITS

Controls for ore emplacement

  • Stream Hydraulics

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Cosumnes River Area

Land status

Ownership category Private

Comments on the workings information

  • DRIFT MINING, 1850'S-1860'S HYDRAULIC, 1930'S-1940'S A SMALL ACREAGE DREDGED

Reference information

Bibliographic references

  • Deposit

    LOGAN, C.A., 1919, PLATINUM AND ALLIED METALS IN CALIFORNIA: CALIFORNIA STATE MINING BUREAU BULLETIN 85, P. 30-31.

  • Deposit

    CLARK, W.B., 1970, GOLD DISTRICTS OF CALIFORNIA: CALIFORNIA DIVISION OF MINES AND GEOLOGY BULLETIN 193, P. 90.

  • Deposit

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

  • Deposit

    MERTIE, J.B., 1969, ECONOMIC GEOLOGY OF THE PLATINUM METALS: U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 630, P. 94.

  • Production

    CLARK, 1970

General comments

Subject category Comment text
Deposit RIVER WAS DREDGED FOR SEVERAL MILES
Deposit RECORD M005603 AND M045270 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.