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Mexican 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. Ore body information
  11. Economic information about the deposit and operations
  12. Workings at the site
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10086550
MRDS ID X025478
Record type Site
Current site name Mexican Group
Alternate or previous names Colorado, Golden Star, South Fork, Mexican No. 1 & No. 2 .
Related records 10140796

Geographic coordinates

Geographic coordinates: -120.81575, 39.57127 (WGS84)
Elevation 1219
Relative position 1 MI. NE OF DOWNIEVILLE

Site location context

Political divisions (FIPS codes)

Sierra(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Downieville(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 020N 010E 25,26,35 California

Comments on the location information

  • UTM EST. HIGH RIDGE E OF DOWNIEVILLE.

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore
Pyrite 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 > Metasedimentary Rock > Quartzite

Economic information

Ore body information

  • Strike N
    Dip 75 E
    Thickness 6.1M

Comments on the geologic information

  • PARALLEL FISSURE VEINS OF QTZ & SLATE MEXICAN 2 - 15 FT. THICK, UNNAMED 2 - 5 FT. THICK. BOTH DIP 70 - 80 E. S. FORK VEIN A CONTACT VEIN W NO ARSENOPYRITE, & FOOTWALL QUARTZITE, HANGING WALL SLATE, 20 FT. WIDE, STRIKES N, DIPS E. HARTLEY VEIN RUNS ACROSS FM, STRIKES NE, DIPS 60 NW, 5 FT. THICK ON FT. & HANGING WALL W 5 FT. HORSE BETWEEN. ADJOINS GOLD BLUFF MINE.

Economic information about the deposit and operations

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

Comments on the production information

  • WORKED IN MEXICAN DAYS. BEFORE 1900 , WORKED FOR 30 YEARS.

Workings at the site

  • Type of workings Surface/Underground
    Area 40.47HA
    Overall depth 38.1M
    Overall length 914.4M

Comments on the workings information

  • 4 ADITS. 1ST 350 FT. ON VEIN, 2ND 125 FT. ABOVE IS IN SAME DISTANCE. (BOTH ON MEXICAN VEINS) SURFACE WORK ON SOUTH FORK VEIN. ON HARTLEY VEIN, 3RD ADIT 300 FT. LONG W 50 FT. ON VEIN. 4TH ADIT, ABOVE 3RD, 70 FT. LONG, 150 FT. ON VEIN, STOPING TO THE SURFACE 45 FT. ABOVE.

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. 60 .

  • Deposit

    LOGAN, C. A., 1929 , SIERRA CO.: CDMM 25TH REPORT STATE MINERALOGIST, APRIL, P. 179 .

  • Deposit

    MACBOYLE, E., 1920 , MINES AND MINERAL RESOURCES SIERRA CO.: CSMB 16TH REPORT STATE MINERALOGIST, DEC. 1918 , P. 102 .

  • Production

    MACBOYLE, 1920

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.