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Gwin Mine

Past Producer in Calaveras county in California, United States with commodities Gold, Silver, Zinc, Copper, Lead
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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 10028712
MRDS ID M005861
Record type Site
Current site name Gwin Mine
Alternate or previous names Paloma, Gwin Ext No. 1
Related records 10284323

Geographic coordinates

Geographic coordinates: -120.76768, 38.26658 (WGS84)
Elevation 320
Relative position 1 MI N OF PALOMA IN RICH GULCH

Site location context

Political divisions (FIPS codes)

Calaveras(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Jackson(quadrangle 1:24,000 scale)

San Andreas(quadrangle 1:100,000 scale)

Sacramento(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

San Joaquin(hydrologic accounting unit)

San Joaquin(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Calaveras

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 005N 011E 21,22,27,28 California

Commodities

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

Comments on the commodity information

  • WHEN GALENA AND SPHALERITE ARE PRESENT IN SMALL AMOUNT, ARE CONSIDERED TO INDICATE GOOD ORE. LARGE CRYSTALS OF ARSENOPYRITE INCLOSE ARBONESCENT MASSES OF CRYSTAL GOLD. FREE GOLD COARSE AND CAUGHT IN NO. 16 SCREEN ON MORTARS, 98 % OF AU RECOVERED THIS WAY - QUITE UNIQUE AND HIGH AVERAGE. SULFIDES IN SLATE HAVE HIGH AG FRACTION AND LOWER AG FRACTION. ORE SHOOT IS PYRAMIDAL IN SHAPE AND VERTICLE AS FAR AS IS EXPLOITED

Materials information

Materials Type of material
Gold Ore
Pyrite Ore
Sphalerite Ore
Albite Gangue
Calcite Gangue
Quartz Gangue
Sericite Gangue

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate
    Rock unit name Mariposa Formation
    Rock description Mariposa Formation
    Stratigraphic age (youngest) Late Jurassic
    Stratigraphic age (youngest) Late Jurassic
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Conglomerate

Nearby scientific data

(1) -120.76768, 38.26658
ListMap

Economic information

Ore body information

  • Strike N 12 W
    Dip 70 NE
    Thickness 9.14M

Comments on the geologic information

  • GWIN VEIN IN SAME MARIPOSA SLATE AS MINES TO NORTH IN AMADOR CO., BELT OF SLATE IS 2000 FT WIDE.

Economic information about the deposit and operations

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

Comments on the production information

  • ESTIMATES FOR TOTAL OUTPUT VARY FROM $6 - $7 MIL OF GOLD AT OLD PRICE, ACTIVE 1850 - 1882 , 1894 - 1908 , 1927 , 1941 , 1946$1399146 TOTAL BULLION OUTPUT 1871-1882, 1897-1901, 2701959 TONS YIELDED $1121425.

Comments on the reserve resource information

  • NEW SOUTH ORE SHOOT CONTAINED FROM 0.79 TO 1.3 OZ OF AU PER TON

Workings at the site

  • Type of workings Underground
    Area 242.82HA
    Overall depth 868.68M

Comments on the workings information

  • DEVELOPED BY 2533 FT VERTICAL MAIN SHAFT, 1800 FT INCLINED SOUTH SHAFT AND SEVERAL OLD SHALLOW SHAFT. MORE THAN 2500 FT OF UNDERGROUND WORKINGS

Reference information

Bibliographic references

  • Deposit

    CLARK, W. B., LYDON, P. A, 1962 , MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY, CALIF.; COUNTY REPORT 2 ; CALIF. DIV. OF MINES AND GEOLOGY, P 56 - 59 156 , AND PL B

  • Deposit

    LOGAN, C. A., 1935 , MOTHER LODE GOLD BELT OF CALIF.: CDM BULL. 108 , P 141 - 2 AND PL 6

  • Deposit

    LOGAN, C. A., FRANKE, H., 1936 , MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY; CALIF. JOUR. MINES AND GEOLOGY, VOL. 32 , NO. 3 ; DIV. OF MINES, P 307

  • Production

    CLARK ( 1962 ) LOGAN ( 1934 )

General comments

Subject category Comment text
Deposit VEIN, STRINGERS ARE COMMON. ARSENOPYRITE IN LGE AND SMALL CRYSTALS. A CONGLOMERATE LIES ON FOOTWALL OF VEIN AND CARRIES $.50 PER TON IN AU. THERE ARE 2 VEINS; EAST OR MAIN VEIN AND WEST VEIN. EAST VEIN MOST PRODUCTIVE. AT 2400 FT LEVEL A NEW ORE BODY ENCOUNTERED, 1700 FT SOUTH OF CROSSCUT FROM MAIN SHAFT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1979 Mateik, R.; Albers, John P. 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.