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  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Le Duc

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. Mining district
  13. Workings at the site
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10101272
MRDS ID C011414
Record type Site
Current site name Le Duc
Related records 10237126

Geographic coordinates

Geographic coordinates: -121.01853, 39.19461 (WGS84)
Elevation 853
Relative position 2 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 Bear(hydrologic unit)

Lower Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Nevada

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 015N 009E 06 California

Comments on the location information

  • UTM EST NW 1/4

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Quartz Gangue

Analytical data

Result SAMPLES RANGE FROM $10 - $58 AU/TON

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate

Nearby scientific data

(1) -121.01853, 39.19461
ListMap

Economic information

Ore body information

  • Thickness 1.22M
    Depth to top 0M

Comments on the geologic information

  • NORTHERN HALF OF PROPERTY CAPPED W/ ANDESITE TUFF & BRECCIA UNDER WHICH IS TERTIARY GRAVEL CHANNEL. VEIN OCCURS AT CONTACT OF SLATE W/DIABASE, ANOTHER VEIN 100 FT E, AT CONTACT OF DIABASE W/SERPENTINE

Economic information about the deposit and operations

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

Mining district

District name Grass Valley

Workings at the site

  • Type of workings Underground
    Length 1219.2M
    Overall depth 88.39M

Comments on the workings information

  • ADIT, TUNNELS, EXTENSIVE WORKINGS

Reference information

Bibliographic references

  • Deposit

    MACBOYLE, E., 1918 , MINES AND MINERAL RESOURCES OF NEVADA COUNTY: CALIFORNIA JOURNAL OF MINES AND GEOLOGY, V. 16 , P. 194 - 195

General comments

Subject category Comment text
Deposit VEINS, 5 , 2 IN - 4 FT THICK
Deposit 122 ACRES ; INFO.SRC : 1 PUB LIT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-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.