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Emma I

Past Producer in Mariposa county in California, United States with commodities Gold, Silver, 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. Ownership information
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10031236
MRDS ID M009883
Record type Site
Current site name Emma I
Related records 10286189

Geographic coordinates

Geographic coordinates: -119.83431, 37.6291 (WGS84)
Relative position 3 1/2 MI. SW OF EL PORTAL

Site location context

Political divisions (FIPS codes)

Mariposa(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

El Portal(quadrangle 1:24,000 scale)

Yosemite Valley(quadrangle 1:100,000 scale)

Mariposa(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Merced(hydrologic unit)

San Joaquin(hydrologic accounting unit)

San Joaquin(hydrologic subregion)

California(hydrologic region)

Federal lands

Sierra 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 Mariposa

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 003S 019E 36 California

Comments on the location information

  • SEC. LINES PROJECTED UTM EST.

Commodities

Commodity Importance
Gold Primary
Silver Secondary
Lead Secondary

Comments on the commodity information

  • RICH BUT SMALL ORE SHOOTS.

Materials information

Materials Type of material
Gold Ore
Quartz Gangue

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate

Nearby scientific data

(1) -119.83431, 37.6291
ListMap

Economic information

Ore body information

  • General form PINCH & SWELL
    Strike NW
    Dip STEEPLY NE

Comments on the geologic information

  • GEOL.DESC: TWO ROUGHLY PARALLEL VEINS. DIORITE FOOTWALL & SLATE HANGING WALL.

Economic information about the deposit and operations

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

Ownership information

  • Type Operator
    Owner Clarke, T. A.

Comments on the workings information

  • IN 1920, A 90-FT. TUNNEL, SEVERAL CAVED TUNNELS AND SURFACE WORKINGS.

Reference information

Bibliographic references

  • Deposit

    BOWEN, O. E., JR., & GRAY, H., JR., 1957 , MINES AND MINERAL DEPOSITS OF MARIPOSA COUNTY, CALIF.: CALIF. JOUR. MINES & GEOL., VOL. 53 , NOS. 1 & 2 , P. 257 .

  • Deposit

    LOWELL, F. L., 1915 , MARIPOSA COUNTY: 14TH REPORT STATE MINERALOGIST ( FOR 1913 - 1914 ), P. 582 .

General comments

Subject category Comment text
Deposit VEINS, ORE SHOOTS
Deposit FORMERLY PART OF THE LITTLE WONDER GROUP OF MINES.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1973 Gere, W. U.S. Geological Survey
Updater 01-JAN-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.