Roscoe Beryl Prospect

The Roscoe Beryl Prospect is a mica and feldspar mine located in Jefferson county, Colorado at an elevation of 6,749 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: Roscoe Beryl Prospect
Secondary: Roscoe Beryl
Secondary: Roscoe Prospect

Commodity

Primary: Mica
Primary: Feldspar
Secondary: Quartz
Tertiary: REE
Tertiary: Beryllium

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

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Surface
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: Blackhawk Fault

Alterations

Not available

Rocks

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

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

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

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

Analytical Data

Not available

Materials

Ore: Gadolinite
Ore: Beryl
Ore: Monazite
Ore: Muscovite
Ore: Xenotime
Gangue: Biotite
Gangue: Magnetite

Comments

Comment (Location): ALONG U.S. 6 ON NORTH SIDE OF CLEAR CREEK CANYON ; INFO FROM LAND.ST :(1975). Body on I-786-A matches this location.

Comment (Commodity): GADOLINITE AND MONAZITE ARE REPORTED, BUT WERE NOT FOUND BY HANLEY AND OTHERS (1950)

Comment (Deposit): PEGMATITE STRIKES N 83 E, DIPS 75 SE AND CROSSES GENERALLY WNW-TRENDING COUNTRY ROCK FOLIATION

Comment (Deposit): A.B. Wilson combined info from records 10142525 and 10215355 and deleted those two records.

Comment (Deposit): Information added to this record from former record 10142525 includes: adding Quartz as a commodity, noting that the latitude/longitude location is supposedly within 10 m of the main pit at 39-44-15-N, -105-21-27-W, PLSS is 3S, 71W, 33, SW, Land status is Federal, Ore body type is pegmatite and primary mode of origin is magmatic differentialtion.

Comment (Deposit): Record 10215355 was a very poor and incomplete record with no references cited.

Comment (Deposit): Deleted record 10142525 listed old MRDS record D010205 as a predecessor. This record was not found.

References

Reference (Deposit): USGS COMMODITY FILE: GR III, REEL 31, DOC. 9937, 1945; GR III, REEL 32, DOC. 100051, 1943; GR III, REEL 40, DOC. 12737, 1943; GR II, REEL 12, DOC. 2701, 1946 (FROM ORIGINAL CRIB RECORD)

Reference (Deposit): MEEVES, H.C., AND OTHERS, 1966, RECONNAISSANCE OF BERYLLIUM-BEARING PEGMATITE DEPOSITS IN SIX WESTERN STATES: USBM IC-8298, P. 28, no. 69.

Reference (Deposit): OLSON, J.C., AND ADAMS, J.W., 1962, THORIUM AND RARE EARTHS IN THE UNITED STATES: USGS MAP MR-28.

Reference (Deposit): HANLEY, J.B., AND OTHERS, 1950, PEGMATITE INVESTIGATIONS IN COLORADO, WYOMING, AND UTAH, 1942-44: USGS PROF. PAPER 227, P. 84-85.

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

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