Grand Republic

The Grand Republic is a gold 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

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: Grand Republic

Commodity

Primary: Gold

Location

State: Colorado
County: Boulder
District: Gold Hill

Land Status

Not available

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
Years of Production:
Organization:
Significant: N

Physiography

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

Mineral Deposit Model

Model Name: Polymetallic veins
Model Name: Alkaline Au-Te (Au-Ag-Te veins)

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Name: Granite
Role: Host
Age Type: Host Rock
Age Young: Neoproterozoic

Analytical Data

Not available

Materials

Ore: Gold

Comments

Comment (Geology): GEOL.DESC: GRANITE CUT BY PEGMATITE AND APLITE DIKES. HOOSIER BRECCIA REEF OFFSET 100 FT. BY GRAND REPUBLIC VEIN. GOLD TELLURIDES WITH PYRITE CHIEF ORE MINERALS

References

Reference (Deposit): LOVERING & GODDARD, 1950, USGS P.P. 223, PG. 251-253

Reference (Deposit): USGS GOLD HILL TOPO QUAD, 1957, 7 1/2 MIN

Reference (Deposit): CONSV. DIV. COMP. DATE, 1,62

Colorado Mining Photos

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