Louisa

The Louisa is a gold mine located in Mariposa county, California at an elevation of 1,726 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: Louisa
Secondary: Louise
Secondary: Louise Point

Commodity

Primary: Gold

Location

State: California
County: Mariposa

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

Type: Underground

Ownership

Owner Name: Lautenschlager, Walter J.

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Discovery Year: 1855
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: TABULAR TO LENTICULAR

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Hydrothermal Alteration Of Serpentine

Rocks

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

Analytical Data

Not available

Materials

Ore: Gold
Gangue: Quartz
Gangue: Ankerite

Comments

Comment (Deposit): VEIN

Comment (Geology): GEOL.DESC: BULK OF THE VEIN CONSISTS OF QUARTZ, MARIPOSITE, ANKERITE ROCK DERIVED FROM HYDRO THERMAL ALTERATION OF SERPENTINE. UPPER OXIDISED PART OF THE VEIN HAS BEEN CONVERTED TO A SPONGY, RUST COLORED, EARTHY ROCK CONSISTING CHIEFLY OF YELLOW IRON OXIDES INTERMIXED WITH QUARTZ STRINGERS. THE VEIN SYSTEM LIES ALONG THE CONTACT OF THE AMADOR GROUP AND MARIPOSA FORMATION.

Comment (Workings): VERTICAL NELSON SHAFT 375 FT. W/3 LEVELS AND AIR SHAFT 150 FT. DEEP, 850 FT. DRIFTS, CROSSCUTS 775 FT. AND 600 FT. WINZES.

Comment (Location): UTM ACC. NW 1/4

Comment (Production): PRINCIPAL ACTIVITY 1894 - 1900 WHEN OPERATORS SPENT MORE THAN $56,000 IN IMPROVEMENTS & DEVELOPMENT.

References

Reference (Deposit): BOWEN, O. E., JR., GRAY, C. H., JR., 1957 , MINES AND MINERAL DEPOSITS OF MARIPOSA COUNTY, CALIFORNIA: CALIF. JOUR. MINES AND GEOLOGY, V. 53 , NOS. 1 AND 2 , P. 119 - 120 , 278 .

Reference (Deposit): CASTELLO, W. O., 1921 , MINES AND MINERAL RESOURCES OF MARIPOSA COUNTY IN SEVENTEENTH REPORT OF THE STATE GEOLOGIST: CALIFORNIA STATE MINING BUREAU. P. 122 .

Reference (Deposit): LAIZURE, C. MCK., 1928 , SAN FRANCISCO FIELD DIVISION IN TWENTY-FOURTH REPORT OF THE STATE MINERALOGIST: CALIFORNIA STATE MINING BUREAU. P. 96 .

Reference (Deposit): AUBURY, L. E., 1904 , REGISTER OF MINES AND MINERALS, MARIPOSA COUNTY CALIFORNIA: CALIFORNIA STATE MINING BUREAU, P. 12 .

Reference (Production): BOWEN & GRAY 1957

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.