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

Unnamed Placer

Past Producer in Jefferson county in Colorado, United States with commodity Gold
Map
XML
JSON
KML
B
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. Geologic structures
  11. Controls for ore emplacement
  12. Economic information about the deposit and operations
  13. Mining district
  14. Land status
  15. Workings at the site
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10013742
MRDS ID D010202
Record type Site
Current site name Unnamed Placer

Geographic coordinates

Geographic coordinates: -105.28975, 39.74305 (WGS84)
Elevation 1853
Relative position 3.7 MILES S 72 W FROM GOLDEN

Site location context

Political divisions (FIPS codes)

Jefferson(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Evergreen(quadrangle 1:24,000 scale)

Denver West(quadrangle 1:100,000 scale)

Denver(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Clear(hydrologic unit)

South Platte(hydrologic accounting unit)

South Platte(hydrologic subregion)

Missouri(hydrologic region)

Geographic areas

Country State County
United States Colorado Jefferson

Public Land Survey System information

Meridian Township Range Section Fraction State
6th Principal 003S 071W 36 SW Colorado

Comments on the location information

  • ALONG SOUTH SIDE OF CLEAR CREEK. ELEV AND LAT-LONG GIVEN ARE FOR CENTER SW 36 ON CREEK. ; INFO FROM LAND.ST :(1975)

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore

Host and associated rocks

  • Host or associated Host
    Rock type Unconsolidated Deposit > Sand and Gravel
    Rock unit name Piney Creek Alluvium;Post-Piney Creek Alluvium
    Rock description Piney Creek Alluvium;Post-Piney Creek Alluvium
    Stratigraphic age (youngest) Holocene

Nearby scientific data

(1) -105.28975, 39.74305
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Front Range Uplift, Denver Basin
Type of structure Local
Structure description Junction Ranch Fault Zone

Controls for ore emplacement

  • Coarse Gravel And Boulders Near Bedrock Contact

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1935
Year of last production 1935

Mining district

District name Lower Clear Creek Area

Land status

Ownership category Private

Workings at the site

  • Type of workings Surface/Underground
    Length 121.92M
    Overall width 12.19M

Comments on the workings information

  • 400-FT-LONG SURFACE CUT AND PROBABLY SOME DRIFTING ON BEDROCK CONTACT

Reference information

Bibliographic references

  • Deposit

    PARKER, B.H., JR., 1974, GOLD PLACERS OF COLORADO: COLORADO SCHOOL OF MINES QUART., V. 69, NO. 3, P. 63-126.

  • Deposit

    SHERIDAN, D.M., AND OTHERS, 1972, GEOLOGIC MAP OF THE EVERGREEN QUADRANGLE, JEFFERSON COUNTY, COLORADO: USGS MAP I-786-A.

General comments

Subject category Comment text
Deposit JUNCTION OF TWO BRANCH SHEARS IN JUNCTION RANCH FAULT ZONE HAVE CAUSED LOCAL ROCK WEAKENING, ALLOWING CREEK TO FORM LOCAL VALLEY WIDENING AND GRAVEL FILL. PROBABLE SLIGHT LOSS OF GRADE AND SUBSEQUENT LOWER STREAM COMPETENCE ACROSS THE WIDENED AREA COULD HAVE CAUSED ACCUMULATION OF GRAVEL AND DEPOSITION OF AU. APPARENTLY GOOD GRADE OF GRAVEL. DEPOSIT ALSO INCLUDES BENCH GRAVELS OF OLDER QUATERNARY (PLEISTOCENE) AGE, LYING 18 TO 45 FT ABOVE STREAM LEVEL ON IRREGULAR BEDROCK SURFACE AND OVERLAIN BY ALLUVIAL FAN AND TALUS DEPOSITS.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1983 Schwochow, Stephen D. Colorado Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Colorado resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.