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
Elevation: 6,601 Feet (2,012 Meters)
Commodity: Feldspar, Beryllium
Lat, Long: 39.78611, -105.25556
Map: View on Google Maps
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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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