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
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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
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