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Four Hills

Past Producer in Sierra county in California, United States with commodities Gold, Lead, Copper
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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. Economic information about the deposit and operations
  13. Land status
  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 10086586
MRDS ID X025565
Record type Site
Current site name Four Hills
Related records 10165222

Geographic coordinates

Geographic coordinates: -120.71075, 39.69849 (WGS84)
Relative position 10 MI. NNW OF SIERRA CITY

Site location context

Political divisions (FIPS codes)

Sierra(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Gold Lake(quadrangle 1:24,000 scale)

Portola(quadrangle 1:100,000 scale)

Chico(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Yuba(hydrologic unit)

Lower Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Federal lands

Tahoe 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 Sierra

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 021N 011E 02,09,10,11 California

Comments on the location information

  • UTM ACC. MINE SHAFT SHOWN ON TOPO. SHEET IN NE 1/4 10 .

Commodities

Commodity Importance
Gold Primary
Lead Tertiary
Copper Tertiary

Comments on the commodity information

  • MOST ORE FROM POCKETS OR SMALL RICH ORE SHOOTS. POCKETS RANGE FROM $1500 - 6000 , NEAR SURFACE. ALSO HIGH GRADE OCCURS WHERE THE VEIN COMES IN CONTACT W MICA SCHIST & WHERE VEINLETS LEAVE THE MAIN VEIN & BUTT AGAINST AND ARE CUT OFF BY MICA SCHIST.

Materials information

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

Mineral occurrence model information

Model code 273
USGS model code 36a
Deposit model name Low-sulfide Au-quartz vein
Mark3 model number 27

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock
    Stratigraphic age (youngest) Late Permian
  • Host or associated Host
    Rock type Metamorphic Rock > Schist > Mica Schist

Nearby scientific data

(1) -120.71075, 39.69849
ListMap

Economic information

Ore body information

  • Strike E 10 N
    Dip 45 SW
    Thickness 6.1M

Comments on the geologic information

  • LARGE BODIES OF QTZ. FORMED BY INTERSECTION OF VEINS. E STRINGERS INTERSECTION W. MAIN VEIN, WHICH VARIES FROM 1 - 20 FT., AVE. 4 - 5 FT. THICK. ON THE N END VEIN STRIKES E, ON THE S END N. VEIN SAID TO RESEMBLE PLUMAS EUREKA.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant Yes

Land status

Ownership category National Forest

Comments on the production information

  • PRODUCTION FROM SPANISH TIMES ONWARD, INTERMITTENTLY. TOTAL ESTIMATED FROM $1 - 3.3 MILLION.

Workings at the site

  • Type of workings Surface/Underground
    Overall depth 100.58M

Comments on the workings information

  • SHAFT ADIT 1100 FT. INTERSECTS SHAFT AT 150 FT. SURFACE & NEAR SURFACE POCKETS MINES.

Reference information

Bibliographic references

  • Deposit

    AVERILL, C. V., 1942 , MINES AND MINERAL RESOURCES OF SIERRA CO.: CDM CALIF. JOUR. MINES AND GEOL., VOL. 38 , NO. 1 , P. 55 .

  • Deposit

    LOGAN, C. A., 1929 , SIERRA CO.: CDMM 25TH REPORT STATE MINERALOGIST, APRIL, P. 164 , 165 , 177 .

  • Deposit

    MACBOYLE, E., 1920 , MINES AND MINERAL RESOURCES SIERRA CO.: CSMB 16TH REPORT STATE MINERALOGIST, DEC. 1918 , P. 87 , 88 .

  • Production

    LOGAN, 1929

General comments

Subject category Comment text
Deposit POCKETS, VEIN, ORE SHOOTS

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1979 Hayden, F. (Albers, J.) U.S. Geological Survey

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.