Pocohontas

The Pocohontas is a copper mine located in Mariposa county, California at an elevation of 2,001 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: Pocohontas

Commodity

Primary: Copper
Secondary: Gold
Secondary: Silver

Location

State: California
County: Mariposa

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Owner Name: Eben N. Briggs (Estate)
Home Office: C/O L. M. Olds

Production

Year: 1916
Material type: ORE
Description: Ap_Grade: ^Avg. 2.8% Cu

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Discovery Year: 1862
Years of Production:
Organization:
Significant: N
Deposit Size: M

Physiography

General Physiographic Area: Pacific Mountain System
Physiographic Province: Pacific Border Province
Physiographic Section: California Trough

Mineral Deposit Model

Not available

Orebody

Form: LENTICULAR

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Hydrothermal

Rocks

Not available

Analytical Data

Analytical Data: 6 - 12 % CU, $2.50/TON AU ( 1902 PRICE

Materials

Ore: Pyrite
Ore: Sphalerite
Ore: Pyrrhotite
Ore: Chalcopyrite
Gangue: Quartz

Comments

Comment (Deposit): SULFIDE ORE OCCURS IN A GANGUE OF BRECCIATED WALL ROCK AND INTRODUCED QUARTZ. ONE SHOOT

Comment (Reserve-Resource): ESTIMATION NOT POSSIBLE DUE TO CONDITIONS OF MINE WORKINGS. NUMEROUS GOSSAN OUTCROPPINGS, AND SHEAR ZONES PARALLEL TO PRINCIPAL ORE ZONE HAVE NOT BEEN THOROUGHLY PROSPECTED. NO INDICATIONS OF LOWERING IN THE GRADE OF ORE WITH DEPTH.

Comment (Production): $30,000 CU IN A THREE - YEAR PERIOD IN EARLY 1900'S.

Comment (Geology): GEOL.DESC: WALL ROCKS CONSIST PRINCIPALLY OF QUARTZ - BIOTITE HORNFELS, QUARTZ - BIOTITE AND QUARTZ - BIOTITE - ANDALUSITE SCHIST. ALONG MINERALIZED ZONE, A SHEET OF HORNBLENDE RICH GRANITIC ROCK INTRUDED PARALLEL TO SCHISTOSITY. THIN SHEETS OF BIOTITE QUARTZ DIORITE PENETRATE SCHIST NEAR MINE OPENINGS. A STOCK OF BIOTITE QUARTZ DIORITE CROPS OUT LESS 400 FT. SE. OF MAIN SHAFT.

Comment (Workings): WORKINGS AS OF 1954 : 7 SHAFTS FROM 15 - 75 FT. DEEP AND TUNNEL DRIVEN NW. MOST SHAFTS INCLINED STEEPLY SE.

Comment (Deposit): Discovery Year: EARLY 1860'S

References

Reference (Deposit): BOWEN, O. E. AND CLIFFTON, G. H., 1957 , MINES AND MINERAL RESOURCES OF MARIPOSA COUNTY, CALIFORNIA, CALIF. JOUR. MINES AND GEOLOGY, VOL. 53 , NO. 1 & 2 , P. 67 - 69 , P. 230 .

Reference (Deposit): ERIC, J. H., 1948 , COPPER IN CALIFORNIA BULL. 144 ; DIV. OF MINES, P. 269 .

Reference (Production): BOWEN, AND CLIFFTON, 1957 , P. 68 (SEE REF.)

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.