Rosemont Mine

The Rosemont Mine is a feldspar and mica mine located in Fremont county, Colorado at an elevation of 8,747 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: Rosemont Mine

Commodity

Primary: Feldspar
Primary: Mica
Secondary: Bismuth

Location

State: Colorado
County: Fremont
District: Micanite 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

Type: Unknown

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Surface
Year First Production: 1950
Discovery Year: 1950
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

Model Name: Pegmatites

Orebody

Not available

Structure

Type: R
Description: Southern Front Range, Thirtynine Mile Volcanic Field

Alterations

Not available

Rocks

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

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

Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Paleoproterozoic
Age Old: Paleoproterozoic

Analytical Data

Not available

Materials

Ore: Microcline
Ore: Muscovite
Ore: Bismutite
Gangue: Biotite
Gangue: Garnet

Comments

Comment (Deposit): 2-FT WIDE POD OF BISMUTH MINERALS FOUND DURING MINING; ZONED PEGMATITE WITH QUARTZ-MICROCLINE CORE, QUARTZ-MICROCLINE-MUSCOVITE-PLAGIOCLASE WALL ZONE

Comment (Location): ABOUT 3000 FT EAST OF MAC GULCH NEAR FREMONT/PARK COUNTY BORDER; JUST WEST OF LITTLE MACK GULCH ; INFO FROM LAND.ST :(1976)

Comment (Reserve-Resource): FELDSPAR VAR. MICROCLINE

Comment (Workings): CUT 1 IS 44X19X10 FT WITH A 36 FT LONG ADIT CONNECTED; CUT 2 IS 6X4X5 FT DEEP

References

Reference (Deposit): HANLEY, J.B., HEINRICH, E.W., PAGE, L.R., 1950, PEGMATITE INVESTIGATIONS IN COLORADO, WYOMING, AND UTAH, 1942-1944: USGS PROFESSIONAL PAPER 227, P. 42-55

Reference (Reserve-Resource): HANLEY, J.B. AND OTHERS, 1950

Reference (Deposit): STERRETT, D.B., 1923, MICA DEPOSITS OF THE UNITED STATES: USGS BULLETIN 740, P. 51-55

Reference (Deposit): WOBUS, R.A., EPIS, R.C. AND SCOTT, G.R., 1979, GEOLOGIC MAP OF THE COVER MOUNTAIN QUADRANGLE, FREMONT, PARK, AND TELLER COUNTIES, COLORADO: USGS MAP I-1179, 1:62,500.

Colorado Mining Photos

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