Cressmans Gulch Prospect

The Cressmans Gulch Prospect is a feldspar and beryllium mine located in Jefferson county, Colorado at an elevation of 6,601 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

Name: Cressmans Gulch Prospect  

State:  Colorado

County:  Jefferson

Elevation: 6,601 Feet (2,012 Meters)

Commodity: Feldspar, Beryllium

Lat, Long: 39.78611, -105.25556

Map: View on Google Maps

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.


Satelite image of the Cressmans Gulch Prospect

Cressmans Gulch Prospect MRDS details

Site Name

Primary: Cressmans Gulch Prospect


Commodity

Primary: Feldspar
Primary: Beryllium
Secondary: Niobium (Columbium)
Secondary: Tantalum
Tertiary: Mica


Location

State: Colorado
County: Jefferson
District: Clear Creek Pegmatite Province


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

Not available


Ownership

Owner Name: Lyman C. And Audrey E. Ladwig
Home Office: Arvada, Co.
Years: 1944 -


Production

Not available


Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
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

Form: TABULAR


Structure

Type: R
Description: Front Range Uplift, Denver Basin

Type: L
Description: Hurricane Hill Fault System


Alterations

Not available


Rocks

Name: Pegmatite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Neoproterozoic

Name: Pegmatite
Role: Associated
Age Type: Host Rock
Age Young: Neoproterozoic

Name: Pegmatite
Role: Associated
Age Type: Associated Rock
Age Young: Neoproterozoic

Name: Pegmatite
Role: Associated
Age Type: Host Rock Unit
Age Young: Neoproterozoic


Analytical Data

Not available


Materials

Ore: Beryl
Ore: Muscovite
Ore: Microcline
Gangue: Albite
Gangue: Biotite
Gangue: Tourmaline
Gangue: Apatite
Gangue: Quartz
Gangue: Manganotantalite


Comments

Comment (Location): IN CRESSMANS GULCH ; INFO FROM LAND.ST :(1975)

Comment (Production): PRESUMED ANNUAL PRODUCTION, YEARS UNKNOWN

Comment (Development): K-FELDSPAR HAS BEEN PRODUCED. PRIOR TO OCT. 1943, 1000 LB BERYL PRODUCED. FROM 10/23/43 TO 1/11/44, REWORKED DUMPS YIELDED 979.5 LB BERYL

Comment (Deposit): PRINCIPAL AND SEVERAL SUBSIDIARY PEGMATITES CUT ACROSS COUNTRY ROCK SCHISTOSITY (N 85 W, 85 TO 90 SW). MAIN ECONOMIC PEGMATITE STRIKES DUE EAST AND DIPS 80 TO 90 S. PEGMATITE CONTAINS 1) WALL ZONE OF QUARTZ-MICROCLINE-ALBITE PEGMATITE WITH TOURMALINE, 2) INTERMEDIATE ZONE OF QUARTZ-ALBITE PEGMATITE WITH BERYL AND APATITE, AND 3) CORE OF QUARTZ-MICROCLINE PEGMATITE.

Comment (Workings): EAST OPEN CUT IS 75 FT LONG, 35 FT WIDE, 40 FT DEEP. WEST OPEN CUT IS 35 FT LONG, 6 TO 20 FT WIDE, 35 FT DEEP.


References

Reference (Deposit): SHERIDAN, D.M., AND OTHERS, 1967, GEOLOGY AND URANIUM DEPOSITS OF THE RALSTON BUTTES DISTRICT, JEFFERSON COUNTY, COLORADO: USGS PROF. PAPER 520 (INCL. GEOLOGIC MAP OF RALSTON BUTTES QUAD)

Reference (Deposit): HANLEY, J.B., AND OTHERS, 1950, PEGMATITE INVESTIGATIONS IN COLORADO, WYOMING, AND UTAH, 1942-44: USGS PROF. PAPER 227, P. 86

Reference (Deposit): MEEVES, H.C., AND OTHERS, 1966, RECONNAISSANCE OF BERYLLIUM-BEARING PEGMATITE DEPOSITS IN SIX WESTERN STATES: USBM IC-8298, P. 27.

Reference (Deposit): USGS COMMODITY FILE, GR III, REEL 31, DOCK. 9937, 1945; GR III, REEL 32, DOCK. 10049, 1943; GR III, REEL 40, DOCK. 12742, 1944 (FROM ORIGINAL CRIB RECORD)

Reference (Production): ORIGINAL CRIB RECORD (SEE USGS REFERENCE)


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