Double Opening Prospect

The Double Opening Prospect is a feldspar mine located in Larimer county, Colorado at an elevation of 8,340 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: Double Opening Prospect

Commodity

Primary: Feldspar
Tertiary: Beryllium
Tertiary: Uranium
Tertiary: Phosphorus-Phosphates

Location

State: Colorado
County: Larimer
District: Crystal Mountain (Storm Mountain) Pegmatite District

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: United Beryllium Ores And Metals Corp.
Home Office: Denver, Co.
Years: 1941 -

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year Last Production: 1941
Discovery Year: 1934
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: LENTICULAR

Structure

Type: R
Description: Front Range Uplift

Type: L
Description: Thompson Canyon Fault, Mt Olympus Batholith, Ne-Trending Folds

Alterations

Not available

Rocks

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

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

Analytical Data

Not available

Materials

Ore: Microcline
Ore: Beryl
Gangue: Uraninite
Gangue: Albite
Gangue: Purpurite
Gangue: Torbernite

Comments

Comment (Location): SOUTH OF SHEEP CREEK AT NE BASE OF BOILER HILL 2.55 MILES ESE OF CRYSTAL MOUNTAIN. ; INFO FROM LAND.ST :(1980)

Comment (Workings): TWO OPEN CUTS, 40 X 35 X 10 FT AND 30 X 10 X 4 FT

Comment (Deposit): ZONED PEGMATITE CONSISTS OF INTERMEDIATE ZONE OF MILKY QUARTZ AND ALBITE, WITH ACCESSORY BERYL, MUSCOVITE, P AND U MINERALS. CORE IS MICROCLINE PEGMATITE WITH SMOKY QUARTZ. PEGMATITE IS ELONGATE CONFORMABLE LENS WITH TWO OFFSHOOTS; TREND IS N 40 E, 60 NW.

References

Reference (Deposit): THURSTON, W.R., 1955, PEGMATITES OF THE CRYSTAL MOUNTAIN DISTRICT, LARIMER COUNTY, COLORADO: USGS BULL. 1011, 185 P., 13 PLS.

Reference (Deposit): HANLEY, J.B., AND OTHERS, 1950, PEGMATITE INVESTIGATIONS IN COLORADO, WYOMING, AND UTAH, 1942-1944: USGS PROF. PAPER 227, P. 90-92.

Colorado Mining Photos

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