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South Fork Group

Past Producer in Sierra county in California, United States with commodity Gold
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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. Economic information about the deposit and operations
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10086520
MRDS ID X025410
Record type Site
Current site name South Fork Group
Alternate or previous names Amethyst, Amethyst Ext Phoebe, Mable, Marguerite, Verdi, Lady Bug, Honey Bee, Bullion
Related records 10214032

Geographic coordinates

Geographic coordinates: -120.84409, 39.48932 (WGS84)
Relative position 1/2 MI E OF FOREST

Site location context

Political divisions (FIPS codes)

Sierra(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Alleghany(quadrangle 1:24,000 scale)

Truckee(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 019N 010E 27 California

Comments on the location information

  • UTM EST. N 1/2

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore
Quartz Gangue

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate
  • Host or associated Host
    Rock type Metamorphic Rock > Schist
  • Host or associated Host
    Rock type Metamorphic Rock > Serpentinite

Nearby scientific data

(1) -120.84409, 39.48932
ListMap

Economic information

Comments on the geologic information

  • SEVERAL VEINS. 1ST BETWEEN SERP BELTS, W N STRIKE, EX DIP MAYBE SAME AS IN AMETHYST WORKINGS, & ALSO IN LINE W KANAKA CREEK SYSTEM; CONSISTS OF QTZ LENSES, MAX THICKNESS 8 FT WHICH PINCH TO A SHEAR ZONE 300 FT S OF ADIT. HANGING WALL W WELL DEFINED SLIP, INDEFINITE FOOT WALL WZONE OF QTZ STRINGERS. GOLD W COARSE ARSENOPYRITE IN HANGING WALL NR SLIP. 400 FT E 2ND VEIN W N STRIKE & E DIP. 3RD VEIN SCARCELY MORE THAN SHEAR ZONE WHICH DIPS STEEPLY W, WAS CROSSED 5000 FT IN FROM ADIT PORTAL.ANOTHER W DIPPING VEIN SHOWN IN OLD MINE MAPS, NO LONGER ACCESSIBLE. OTHER SMALLER VEINS. FOR AMETHYST WORKINGS. THERE WERE SEVERAL SML HIGH-GRADE ORE SHOOTS. VEIN HERE STRIKES A FEW DEGREES E OF N, W STEEP E DIP. ORE SHOOTS AT JUNCTION OF MAIN VEIN W MINOR BRANCHES. 300 FT W OF AMETHYST SHAFT A SML VEIN, ESSENTIALLY A SHEAR ZONE W A LITTLE QTZ, HAS NORTHERLY STRIKE, DIPS 60 W

Economic information about the deposit and operations

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

Comments on the production information

  • NO OTHER PRODUCTION RECORD FOUND

Comments on the workings information

  • ADIT 5500 FT. WINZES, LEVELS AMETHYST MINE SHAFT.

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit VEINS

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.

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.