Big Horn Shaft

The Big Horn Shaft is a molybdenum mine located in Boulder county, Colorado.

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

Name: Big Horn Shaft  

State:  Colorado

County:  Boulder

Elevation:

Commodity: Molybdenum

Lat, Long: 40.00083, -105.56389

Map: View on Google Maps

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.


Satelite image of the Big Horn Shaft

Big Horn Shaft MRDS details

Site Name

Primary: Big Horn Shaft
Secondary: Caribou


Commodity

Primary: Molybdenum


Location

State: Colorado
County: Boulder


Land Status

Not available


Holdings

Not available


Workings

Not available


Ownership

Not available


Production

Not available


Deposit

Record Type: Site
Operation Category: Past Producer
Deposit Type: Vein
Operation Type: Unknown
Years of Production:
Organization:
Significant: N


Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Southern Rocky Mountains


Mineral Deposit Model

Not available


Orebody

Not available


Structure

Not available


Alterations

Not available


Rocks

Not available


Analytical Data

Analytical Data: AVERAGE GRADE MOS2 - 0.5 - 0.75%


Materials

Ore: Molybdenite


Comments

Comment (Production): ITEM 8 IS THE TOTAL OUTPUT OF THREE MINES: THE BONITA MINE (LATER KNOWN AS THE MAUDINA), MORNING STAR, AND PURE GOLD.

Comment (Commodity): ORIGINALLY LOCATED FOR GOLD. TUNGSTEN FIRST PRODUCED IN 1908

Comment (Geology): IN THE PURE GOLD AND MORNING STAR MINES THE MINERALIZATION IS CLOSELY RELATED TO MOGUL FAULT AND SUBSIDIARY FAULTS WHICH STRIKE NORTHWEST, DIP SOUTHERLY, AND SEPARATE PRE-CAMBRIAN GRANITE ON THE NORTH FROM APACHE AND PALEOZOIC SEDIMENTARY ROCKS ON THE SOUTH. THE FAULT EXTENDS FOR 10 MI. ALONG THE NORTH END OF THE RANGE AND APPEARS TO WARRANT MORE EXTENSIVE EXPLORATION FOR TUNGSTEN ORE BODIES.


References

Reference (Deposit): WORCESTER, 1919, MOLYBDENUM DEPOSITS OF COLO.: COLO. GS BULL. 14


Colorado Mining Photos

Placer mines at Cripple Creek, Colorado ca. 1892

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