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Valdor Dredge

Producer in Trinity county in California, United States with commodities Gold, Platinum, Osmium, Iridium
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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. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  15. Land status
  16. Workings at the site
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10038041
MRDS ID M045305
Record type Site
Current site name Valdor Dredge
Alternate or previous names Hertevant Mine, Trinity Center
Related records 10238715

Geographic coordinates

Geographic coordinates: -123.09639, 40.7654 (WGS84)
Elevation 420
Location accuracy 100(meters)
Relative position 5 MI BELOW JUNCTION CITY ON TRINITY RIVER, Accurate Within Dredged Area, Accurate Within Dredged Area

Site location context

Political divisions (FIPS codes)

Trinity(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Dedrick(quadrangle 1:24,000 scale)

Hayfork(quadrangle 1:100,000 scale)

Redding(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Trinity(hydrologic unit)

Klamath(hydrologic accounting unit)

Klamath-Northern California Coastal(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Trinity

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 034N 011W 27,28,34,35,36 California

Comments on the location information

  • LOCATION GIVEN IS WHERE VALDOR GULCH ENTERS TRINITY RIVER ON COOPERS BAR

Commodities

Commodity Importance
Gold Primary
Platinum Critical Secondary
Osmium Tertiary
Iridium Critical Tertiary

Comments on the commodity information

  • PT OCCURS AS FINE FLAKES AND CRYSTALLINE SHARP PIECES

Materials information

Materials Type of material
Gold Ore

Analytical data

Result AVERAGE ANALYSIS OF PGE SAMPLES YIELDED 41.97% PT, 52.73% OSMIRIDIUM, 1.30% AU (LOGAN, P. 109), BUT VALUES VARY CONSIDERABLY. PT:AU=1.25:100. TABLING OF BLACK SAND CONCENTRATE FROM 1 TON OF SAND CARRIES 0.112 OZ AU, 0.016 OZ PT, 0.014 OZ OSMIRIDIUM. GOLD FINENESS = $16-19/OZ

Mineral occurrence model information

Model code 119
USGS model code 39a
Deposit model name Placer Au-PGE
Mark3 model number 54

Host and associated rocks

  • Host or associated Host
    Rock type Unconsolidated Deposit > Alluvium
    Stratigraphic age (youngest) Holocene

Nearby scientific data

(1) -123.09639, 40.7654
ListMap

Economic information

Ore body information

  • General form STREAM SEDIMENT DEPOSITS
    Thickness 6.1M
    Depth to top 3.66M

Controls for ore emplacement

  • Stream Hydraulics

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1916

Mining district

District name Trinity River Area

Land status

Ownership category Private

Comments on the production information

  • LARGEST PRODUCER OF PT IN TRINITY COUNTY (LOGAN). 900,000 YD DREDGED THROUGH 1917

Workings at the site

  • Type of workings Surface/Underground
    Area 29.948HA

Comments on the workings information

  • DREDGING, SURFACE MINING, DRIFT MINING, HYDRAULIC

Reference information

Bibliographic references

  • Deposit

    LOGAN, C.A., 1919, PLATINUM AND ALLIED METALS IN CALIFORNIA: CALIFORNIA STATE MINING BUREAU BULLETIN 85, P. 84-85, 35.

  • Deposit

    CLARK, W.B., 1970, GOLD DISTRICTS OF CALIFORNIA: CALIFORNIA DIVISION OF MINES AND GEOLOGY BULLETIN 193, P. 143-144.

General comments

Subject category Comment text
Deposit AU FOUND WITHIN 3 FT OF BEDROCK

Reporter information

Type Date Name Affiliation Comment
Reporter 01-DEC-74 Blair, Will N. U.S. Geological Survey
Updater 01-JAN-89 Peterson, Jocelyn A. 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.