Transylvania Tunnel

The Transylvania Tunnel is a silver mine located in Custer county, Colorado at an elevation of 9,350 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: Transylvania Tunnel

Commodity

Primary: Silver
Secondary: Lead
Secondary: Zinc

Location

State: Colorado
County: Custer
District: Rosita

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: Underground

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Deposit Type: Vein
Operation Type: Underground
Discovery Year: 1895
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

Not available

Structure

Type: R
Description: Rosita Volcanic Center, Wet Mtns

Type: L
Description: Rosita Fault, Ne-Trending Fault

Alterations

Alteration Type: L
Alteration Text: Argillization

Rocks

Name: Trachyte
Role: Associated
Age Type: Host Rock
Age Young: Oligocene

Name: Trachyte
Role: Associated
Age Type: Associated Rock
Age Young: Miocene

Analytical Data

Not available

Materials

Ore: Sphalerite
Ore: Galena
Gangue: Kaolin

Comments

Comment (Location): SE SLOPE OF POCAHONTAS HILL ; INFO FROM LAND.ST :(1976)

Comment (Deposit): TUNNEL DRIVEN AT RIGHT ANGLE TO DIKE OF SPHERULITIC RHYOLITE

Comment (Workings): TUNNEL, SHAFT NEAR MOUTH OF TUNNEL, DRIFT OFF OF SHAFT

References

Reference (Deposit): CROSS, WHITMAN, 1896, GEOLOGY OF SILVER CLIFF AND THE ROSITA HILLS, COLORADO: USGS 17TH ANN. REPORT, PT 2, P. 263-403.

Reference (Deposit): SHARP, W.M., 1978, GEOLOGIC MAP OF THE SILVER CLIFF AND ROSITA VOLCANIC CENTERS, CUSTER COUNTY, COLORADO: USGS MAP I-1081.

Colorado Mining Photos

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