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

Boulder

Past Producer in Placer 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. Ownership information
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10007717
MRDS ID C012203
Record type Site
Current site name Boulder
Alternate or previous names Bowlder
Related records 10261742

Geographic coordinates

Geographic coordinates: -121.11742, 38.89656 (WGS84)
Elevation 290
Relative position 3 MI. W AUBURN 1/2 MI. E OPHIR

Site location context

Political divisions (FIPS codes)

Placer(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Auburn(quadrangle 1:24,000 scale)

Sacramento(quadrangle 1:100,000 scale)

Sacramento(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Placer

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 012N 008E 18 California

Comments on the location information

  • UTM EST. NE 1/4 , NE 1/4

Commodities

Commodity Importance
Gold Primary

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

Nearby scientific data

(1) -121.11742, 38.89656
ListMap

Economic information

Ore body information

  • Strike N 40 W
    Dip 45 SW
    Thickness 0.91M

Economic information about the deposit and operations

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

Mining district

District name Ophir

Ownership information

  • Type Owner
    Owner Jack Smith
    First year 1935

Workings at the site

  • Type of workings Underground
    Length 91.44M
    Overall depth 76.2M

Comments on the workings information

  • SHAFT, TUNNEL

Reference information

Bibliographic references

  • Deposit

    WARING, CLARENCE A., 1917 , PLACER COUNTY: REPORT 15 OF THE STATE MINERALOGIST, CALIFORNIA STATE MINING BUREAU, P. 335 .

  • Deposit

    CRAWFORD, J. J., 1896 , GOLD - PLACER: REPORT 13 OF THE STATE MINERALOGIST, CALIFORNIA STATE MINING BUREAU, P. 205 .

General comments

Subject category Comment text
Deposit VEIN, 2 - 3 FT. THICK. 3 DIFFERENT ORE SHOOTS WORKED QUARTZ STRINGERS W/SULFIDES.
Deposit PATENTED ; INFO.SRC : 1 PUB LIT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1979 Nelson, Scott C. (Albers, John, P.) 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.