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  3. Mineral Resource Data System (MRDS)

Seven Thirty

Past Producer in Nevada 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 10101195
MRDS ID C010901
Record type Site
Current site name Seven Thirty

Geographic coordinates

Geographic coordinates: -121.12104, 39.18406 (WGS84)
Elevation 610
Relative position ON DEAD MANS FLAT 4 MI SE GRASS VALLEY

Site location context

Political divisions (FIPS codes)

Nevada(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Grass Valley(quadrangle 1:24,000 scale)

Yuba City(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

Bureau of Land Management(Bureau of Land Management CA)

Bureau of Land Management CA BLM(Type of land area)

BLM(Federal land areas administered by BLM)

Geographic areas

Country State County
United States California Nevada

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 015N 008E 05,06 California

Comments on the location information

  • UTM EST E 1/2 6 , W 1/2 5

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 Plutonic Rock > Mafic Intrusive Rock > Diorite > Diabase

Nearby scientific data

(1) -121.12104, 39.18406
ListMap

Economic information

Ore body information

  • Strike N
    Dip 65 W
    Depth to top 0M

Comments on the geologic information

  • HANGING WALL CALCAREOUS DIABASE, FOOTWALL DIORITE

Economic information about the deposit and operations

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

Workings at the site

  • Type of workings Underground
    Overall depth 51.82M

Comments on the workings information

  • INCLINE W/2 LEVELS

Reference information

Bibliographic references

  • Deposit

    HOBSON, J. B., WILTSEE, E. A., 1893 , NEVADA COUNTY: CALIFORNIA JOURNAL OF MINES AND GEOLOGY, V. 11 , P. 284

General comments

Subject category Comment text
Deposit VEIN, AVG. 8 IN. THICK
Deposit SEE ALCADE ; INFO.SRC : 1 PUB LIT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1979 Bowman, J. And Albers, J. U.S. Geological Survey PARSED HOST ROCK AND ASSOCIATED ROCK INFORMATION FROM OLD SINGLE VALUED FIELD TO NEW MULTIVALUED FIELD
Editor 27-APR-1995 Mosier, Dan 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.