Pocohontas

  

Mine Info

State: California

County: Mariposa

Elevation: 2,001 feet (610 meters)

Primary Mineral: Copper

Lat, Long: 37.34417, -120.06333



Pocohontas MRDS details

Site Name

Commodity

Location

Primary: "Pocohontas"
Primary: Copper
Secondary: Gold
Secondary: Silver
State: California
County: Mariposa
District:
 

Land Status

Holdings

Workings

Land ownership:
Administrative Organization:
Type:


Ownership

Production

Deposit

Owner Name: Eben N. Briggs (Estate)
Company ID:
Percent:
Home Office: C/O L. M. Olds
Info Year:
Years: -

Year: 1916
Time Period:
Mined:
Material type: ORE
Description: Ap_Grade: ^Avg. 2.8% Cu
Record Type: Site
Operation Category: Past Producer
Deposit Type:
Plant Type:
Plant Subtype:
Operation Type: Unknown
Mining Method:
Milling Method:
Year First Production:
Year Last Production:
Discovery Year: 1862
Discovery Method:
Years of Production:
Organization:
Significant: N
Deposit Size: M


Physiography

Mineral Deposit Model

Orebody

General Physiographic Area: Pacific Mountain System
Physiographic Province: Pacific Border Province
Physiographic Section: California Trough
Physiographic Detail:
Name:
Form: LENTICULAR


Structure

Alterations

Rocks

Alteration Type: L
Alteration:
Alteration Text: Hydrothermal


Analytical Data

Materials

Analytical Data : 6 - 12 % CU, $2.50/TON AU ( 1902 PRICE
Ore: Pyrite
Ore: Sphalerite
Ore: Pyrrhotite
Ore: Chalcopyrite
Gangue: Quartz


Comments

Comment Type:
Deposit
Comment SULFIDE ORE OCCURS IN A GANGUE OF BRECCIATED WALL ROCK AND INTRODUCED QUARTZ. ONE SHOOT
Comment Type:
Reserve-Resource
Comment 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 Type:
Production
Comment $30,000 CU IN A THREE - YEAR PERIOD IN EARLY 1900'S.
Comment Type:
Geology
Comment 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 Type:
Workings
Comment WORKINGS AS OF 1954 : 7 SHAFTS FROM 15 - 75 FT. DEEP AND TUNNEL DRIVEN NW. MOST SHAFTS INCLINED STEEPLY SE.
Comment Type:
Deposit
Comment Discovery Year: EARLY 1860'S


References

Reference Category:
Deposit
Pages:
Reference: 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 .
URL:
Reference Category:
Deposit
Pages:
Reference: ERIC, J. H., 1948 , COPPER IN CALIFORNIA BULL. 144 ; DIV. OF MINES, P. 269 .
URL:
Reference Category:
Production
Pages:
Reference: BOWEN, AND CLIFFTON, 1957 , P. 68 (SEE REF.)
URL:

Did You Know.......

A mine is a hole in the ground, owned by a liar.
-Mark Twain

About The MRDS Mines Database

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.

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