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Chicago

Past Producer in Placer county in California, United States with commodities Gold, Silver, Copper, Lead, Zinc
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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. Economic information about the deposit and operations
  13. Production statistics
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10007744
MRDS ID C012714
Record type Site
Current site name Chicago
Alternate or previous names Auburn - Chicago, Falls Creek
Related records 10285548

Geographic coordinates

Geographic coordinates: -121.1577, 38.85183 (WGS84)
Elevation 177
Relative position 1 MI. E PENRYN 2 MI. SW NEWCASTLE

Site location context

Political divisions (FIPS codes)

Placer(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Rocklin(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 Placer

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 012N 007E 35,36 California

Comments on the location information

  • UTM EST. NE 1/4 35

Commodities

Commodity Importance
Gold Primary
Silver Secondary
Copper Secondary
Lead Secondary
Zinc Critical Secondary

Materials information

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

Analytical data

Result ASSAYS .5 OZ AU/TON - 1.4 OZ AU/TON

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite

Nearby scientific data

(1) -121.1577, 38.85183
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Vein Faulted In Places

Ore body information

  • Strike N 20 W
    Dip 90
    Thickness 0.91M

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No

Production statistics

  • Year 1938
    Period 1933-1938
    Accuracy Estimate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 30wt-pct

Comments on the production information

  • AVG. YIELD DURING 1ST YEAR OF MILLING EST. $17 AU/TON. NO OTHER PRODUCTION RECORD FOUND.

Workings at the site

  • Type of workings Underground
    Length 667.51M
    Overall depth 152.4M

Comments on the workings information

  • 2 SHAFTS, WINZE, DRIFTS, 2 RAISES

Reference information

Bibliographic references

  • Deposit

    LOGAN, C. A., 1936 , GOLD MINES OF PLACER COUNTY, CALIFORNIA: CALIFORNIA JOURNAL OF MINES AND GEOLOGY, V. 32 , NO. 1 , P. 16 - 17 , 42 .

  • Deposit

    GOODWIN, J. G., 1957 , LEAD AND ZINC IN CALIFORNIA: CALIFORNIA JOURNAL OF MINES AND GEOLOGY, V. 53 , NOS. 3 AND 4 , P. 588 .

  • Deposit

    RICE, S. J., 1951 , COUNTIES OF CALIFORNIA: CALIFORNIA JOURNAL OF MINES AND GEOLOGY, V. 47 , NO. 2 , P. 350 .

  • Production

    LOGAN ( 1936 ) GOODWIN ( 1957 ) RICE ( 1951 )

General comments

Subject category Comment text
Deposit VEIN, FEW IN - 3 FT. THICK GENERALLY 1 - 2 FT. THICK IN ORE SHOOTS. WIDEST PARTS REPORTEDLY LOW GRADE, LESS THAN 1 % SULFIDES.
Deposit SOUTH OF THE ELIZABETH, NORTH OF THE MARY LEN CLAIM. ; INFO.SRC : 1 PUB LIT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1979 Nelson, Scott C. (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.