McMillan Group

The McMillan Group is a silver and gold mine located in Huerfano county, Colorado at an elevation of 12,080 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

Name: McMillan Group  

State:  Colorado

County:  Huerfano

Elevation: 12,080 Feet (3,682 Meters)

Commodity: Silver, Gold

Lat, Long: 37.59028, -105.48583

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 McMillan Group

McMillan Group MRDS details

Site Name

Primary: McMillan Group
Secondary: Courthouse vein system


Commodity

Primary: Silver
Primary: Gold
Tertiary: Tellurium
Tertiary: Copper
Tertiary: Bismuth


Location

State: Colorado
County: Huerfano
District: Blanca District District


Land Status

Land ownership: National Forest
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

Not available


Ownership

Not available


Production

Not available


Deposit

Record Type: Site
Operation Category: Occurrence
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: Rocky Mountain System
Physiographic Province: Southern Rocky Mountains


Mineral Deposit Model

Model Name: Epithermal veins


Orebody

Form: TABULAR


Structure

Type: R
Description: Sierra Blanca Massif, Rio Grande Rift Zone, Ft. Garland Embayment

Type: L
Description: Sangre De Cristo Mtns Thrust Fault


Alterations

Not available


Rocks

Name: Mafic Intrusive Rock
Role: Associated
Age Type: Host Rock
Age Young: Neoproterozoic

Name: Mafic Intrusive Rock
Role: Associated
Age Type: Associated Rock
Age Young: Neoproterozoic


Analytical Data

Not available


Materials

Ore: Hessite
Ore: Sylvanite


Comments

Comment (Location): ON NORTH SLOPE OF BLANCA PEAK IN HEADWATERS OF HUERFANO RIVER. LAT-LONG GIVEN IS PROJECTED EAST QUARTER-CORNER OF SEC. 25. ; INFO FROM LAND.ST :(1975)

Comment (Workings): CROSSCUT TUNNEL AND 40-TON CONCENTRATING MILL


References

Reference (Deposit): ECKEL, E.B., 1961, USGS BULL. 1114, P. 322-323.

Reference (Deposit): VANDERWILT, J.W., 1947, MINERAL RESOURCES OF COLORADO: COLORADO MINERAL RESOURCES BD., P. 31.

Reference (Deposit): COLO. DIV. MINES 1901-02 BIENN. REPT., P. 97-98.


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.