Mackey Mine

The Mackey Mine is a chromium mine located in Tuolumne county, California at an elevation of 1,299 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: Mackey Mine

Commodity

Primary: Chromium

Location

State: California
County: Tuolumne
District: Jamestown Area

Land Status

Land ownership: Private
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

Owner Name: W. A. Fitzgerald

Owner Name: Gradella, John
Home Office: Route 3, Box 32, Sonora, Ca. 95370

Production

Year: 1918
Time Period: 1917-1918
Material type: ORE
Description: Cp_Grade: ^32-40% Cr2o3

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1865
Year Last Production: 1918
Discovery Year: 1865
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: POD

Structure

Type: R
Description: Located In The Melones Fault Zone

Type: L
Description: Intense Shearing Of Most Rocks.

Alterations

Alteration Type: L
Alteration Text: Serpentinization Of Saxonite

Rocks

Name: Harzburgite
Role: Host
Age Type: Host Rock Unit
Age Young: Late Jurassic

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

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

Analytical Data

Analytical Data: ORE AVERAGED 32-44% CR2O3

Materials

Ore: Chromite
Gangue: Asbestos
Gangue: Uvarovite
Gangue: Talc

Comments

Comment (Deposit): ONE ORE BODY MINED HAD ABOVE DIMENSIONS.

Comment (Location): THE QUARRY TO THE NORTH OF WOODS CREEK OCCUPIES THE FORMER SITE OF MACKEY MINE.

Comment (Development): DEPOSIT PROBABLY MINED OUT

Comment (Workings): WORKINGS CONSISTED OF 4 SMALL PITS, A CAVED DRIFT AND A 215 FT LONG TUNNEL, NOW CAVED (1918).

Comment (Geology): THE MINE OCCURS IN THE NORTHERN PART OF THE EASTERNMOST OF TWO SERPENTINE BELTS THAT TREND NW-SE ACROSS THE COUNTY. THE BELT IS EXPOSED OVER AN AREA OF 3KM BY 1.5KM.

Comment (Deposit): Discovery Year: 1860'S

References

Reference (Deposit): STINSON, M.C., 1975, CDMG MINERAL PROPERTY REPORT, UNPUBLISHED

Reference (Deposit): CATER, F.W. JR., 1948, CDMG BULL 134, PART 3, CHAPT. 1, P. 14.

Reference (Production): CATER, 1948, CDMG BULL 134, PART 3, CHAPT. 1, P. 14.

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.