Big Four Mine

The Big Four Mine is a gold and silver mine located in Larimer county, Colorado at an elevation of 5,640 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: Big Four Mine

Commodity

Primary: Gold
Primary: Silver

Location

State: Colorado
County: Larimer
District: Masonville District

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Producer
Deposit Type: Vein
Operation Type: Unknown
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Interior Plains
Physiographic Province: Great Plains Province
Physiographic Section: Colorado Piedmont

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Type: R
Description: Front Range Uplift, Cheyenne Basin

Type: L
Description: Big Thompson Anticline, Milner Mountain Fault, Fletcher Hill (Buck Horn) Fault, Masonville Anticline, Buckhorn Syncline, Masonville Stock , Redstone Fault

Alterations

Alteration Type: L
Alteration Text: Hydrothermal Montmorillonite In Fractures

Rocks

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

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

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

Analytical Data

Not available

Materials

Gangue: Montmorillonite

Comments

Comment (Workings): ONE TUNNEL DRIVEN GENERALLY NE

Comment (Location): ON HILLSIDE ABOVE BUCKHORN CREEK 0.6 MILE NNE FROM MASONVILLE.

References

Reference (Deposit): WOLFE, J.A., 1953, GEOLOGY OF THE MASONVILLE MINING DISTRICT, LARIM ER COUNTY, COLORADO: COLORADO SCHOOL OF MINES M.SC. THESIS T-789.

Reference (Deposit): BRADDOCK, W.A., AND OTHERS, 1970, GEOLOGIC MAP OF THE MASONVILLE QU ADRANGLE, LARIMER COUNTY, COLORADO: USGS MAP GQ-832.

Colorado Mining Photos

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