Horseshoe Claim, Grassely Group

The Horseshoe Claim, Grassely Group is a chromium mine located in Tuolumne county, California at an elevation of 1,070 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: Horseshoe Claim, Grassely Group
Secondary: Pedro Lease 1918

Commodity

Primary: Chromium

Location

State: California
County: Tuolumne
District: Peoria Flat Area

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Owner Name: Grassley, Eugene

Owner Name: George Everhart

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1914
Year Last Production: 1944
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Pacific Mountain System
Physiographic Province: Cascade-Sierra Mountains
Physiographic Section: Sierra Nevada

Mineral Deposit Model

Not available

Orebody

Form: LENSE

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Serpentinization Of Saxonite

Rocks

Name: Dunite
Role: Host
Age Type: Host Rock
Age Young: Late Jurassic

Name: Dunite
Role: Host
Age Type: Associated Rock Unit
Age Young: Late Jurassic

Name: Dunite
Role: Host
Age Type: Host Rock Unit
Age Young: Late Permian

Analytical Data

Not available

Materials

Ore: Chromite

Comments

Comment (Reserve-Resource): CDMG MINERAL PROPERTY REPORT, UNPUBLISHED

Comment (Location): MINE IS LOCATED ON THE NW SIDE OF A SMALL HILL.

Comment (Workings): WORKINGS CONSISTED OF AN OPEN PIT AND A 40 FT DEEP SHAFT

Comment (Geology): THE DEPOSIT OCCURS IN THE NORTHERN PART OF THE WESTERN MOST OF TWO SERPENTINE BELTS THAT TREND NW-SE ACROSS THE COUNTY. THE BELT IS EXPOSED OVER AN AREA 30 KM BY 6 KM.

Comment (Deposit): ORE ZONE HAS ABOVE DIMENSIONS AND AVERAGES APPROX. 35% CR2O3

References

Reference (Deposit): CATER, F.W. JR., 1948, CDMG BULL 134, PART 3, CHAPT. 1, P. 26,27

Reference (Deposit): STINSON, M.C., 1975, CDMG MINERAL PROPERTY REPORT, UNPUBLISHED.

Reference (Production): CDMG BULL 134, PT. 3, CHAPT. 1, P. 27

California Gold

"Where to Find Gold in California" looks at the density of modern placer mining claims along with historical gold mining locations and mining district descriptions to determine areas of high gold discovery potential in California. Read more: Where to Find Gold in California.