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  3. Mineral Resource Data System (MRDS)

Eastern Cross 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. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Ore body information
  12. Economic information about the deposit and operations
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10034767
MRDS ID M021668
Record type Site
Current site name Eastern Cross Group
Alternate or previous names Eastern Star

Geographic coordinates

Geographic coordinates: -120.82909, 39.46461 (WGS84)
Elevation 1326
Relative position 3/4 MI E OF ALLEGHANY

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;018N 010E;010E 35;02 California

Comments on the location information

  • UTM EST. SW 1/4 34, NW 1/4 02

Commodities

Commodity Importance
Gold Primary

Comments on the commodity information

  • HIGH GRADE ORE NEAR WHERE VEIN CUTS & DISPLACES SERPENTINE DIKE RICH ANGULAR GRAVEL FROM JEWEL VEIN, PROBABLY, A SINGLE FRAGMENT CARRYING $1100 IN GOLD.

Materials information

Materials Type of material
Gold Ore
Quartz Gangue

Alteration

  • (Local) Carbonate

Host and associated rocks

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

Nearby scientific data

(1) -120.82909, 39.46461
ListMap

Economic information

Ore body information

  • Strike N 65 W
    Dip 50 NE

Comments on the geologic information

  • COUNTRY ROCK MORE THAN USUALLY SCHISTOSE & CARRIES ABUNDANT QTZ STRINGERS PARALLEL TO SCHISTOSITY. GABBRO CROPS OUT IN E PT. OF CLAIM & IS THE W PROLONGATION OF GABBRO-SERPENTINE COMPLEX OF SE PART OF DISTRICT. SMALL OUTCROPS OF SERPENTINE. 4 VEINS ON PROPERTY. EASTERN CROSS & JEWEL DIP TO NE, EASTERN STAR & WESTERN CROSS TO THE NW. POSSIBLE REVERSE DISPLACEMENT ON EASTERN CROSS FISSURE NOT MORE THAN 50 FT. ADIT ACCESSIBLE IRREGULAR VEIN HAS 30-70 DEG. DIP, FOLLOWS WELL-DEFINED SLIP, W GABBRO HANGING WALL, SCHIST FOOTWALL. SOMETIMES NO QTZ. ELSE WHERE 6 IN - 2 FT THICK. WHERE COUNTRY ROCK IS GABBRO, THERES EXTENSIVE CARBONATE ALTERATION OF WALL ROCK. 2 REVERSE FAULTS, & DIP OF VEIN MAYBE DUE TO FAULT DRAG. MINOR THRUSTS ALONG VEIN PLANE. ON EASTERN STAR, SERPENTINE FOOTWALL ALTERED FOR A FEW FEET TO CARBONATE-MARIPOSITE, NEAR SILICIFIED SCHIST: VEIN IS CRUSHED ZONE IN SCHIST 3 FT THICK, STRIKES N 12 W DIPS 60 W. JEWEL VEIN ON W PART OF PROPERTY, STRIKES N 55 W, DIPS 75 NE.

Economic information about the deposit and operations

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

Comments on the production information

  • UPPER WORKINGS YIELDED $2500, PRIOR TO 1932. NO OTHER PRODUCTION RECORDS FOUND.

Comments on the workings information

  • 1 ADIT ACCESSIBLE, OTHERS CAVED. ADIT IS 450 FT LONG.

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit VEIN

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.