Unnamed Placer

The Unnamed Placer is a gold mine located in Jefferson county, Colorado at an elevation of 6,079 feet.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Unnamed Placer

Commodity

Primary: Gold

Location

State: Colorado
County: Jefferson
District: Lower Clear Creek Area

Land Status

Land ownership: Private
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

Holdings

Not available

Workings

Type: Surface/Underground

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Deposit Type: Placer
Operation Type: Unknown
Year First Production: 1935
Year Last Production: 1935
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Southern Rocky Mountains

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Type: R
Description: Front Range Uplift, Denver Basin

Type: L
Description: Junction Ranch Fault Zone

Alterations

Not available

Rocks

Name: Sand and Gravel
Role: Host
Age Type: Host Rock
Age Young: Holocene

Analytical Data

Not available

Materials

Ore: Gold

Comments

Comment (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.

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

Comment (Workings): 400-FT-LONG SURFACE CUT AND PROBABLY SOME DRIFTING ON BEDROCK CONTACT

References

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

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

Colorado Mining Photos

Check out this collection of Colorado's best historic mining photos: Incredible Photos of Colorado Mining Scenes.