Black Hill

  

Mine Info

State: California

County: Mariposa

Elevation:

Primary Mineral: Gold

Lat, Long: 37.71972, -120.20667



Black Hill MRDS details

Site Name

Commodity

Location

Primary: "Black Hill"
Secondary: "Pumpkin"
Primary: Gold
State: California
County: Mariposa
District:
 

Land Status

Holdings

Workings

Land ownership:
Administrative Organization:
Type: Underground


Ownership

Production

Deposit

Owner Name: Louise A. Boyd
Company ID:
Percent:
Home Office:
Info Year:
Years: -

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: 1867
Discovery Method:
Years of Production:
Organization:
Significant: N
Deposit Size: S


Physiography

Mineral Deposit Model

Orebody

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


Structure

Alterations

Rocks

Type: L
Structure:
Description: En Echelon Vein System


Analytical Data

Materials

Ore: Gold
Ore: Pyrite


Comments

Comment Type:
Location
Comment E 1/2 . UTM EST.
Comment Type:
Commodity
Comment LOW GRADE ORE
Comment Type:
Workings
Comment MAIN INCLINED SHAFT SURMOUNTED BY A WOODEN HEADFRAME AND ORE BIN, TWO TUNNELS, SEVERAL AUXILLIARY SHAFTS AND STOPES.
Comment Type:
Production
Comment LITTLE RECORD OF ACTIVITY BEFORE 1890'S WHEN CONSIDERABLE DEVELOPMENT WORK MUST HAVE BEEN DONE. MINE REOPENED IN 1900 AND SOME RICH ORE WAS DISCOVERED.VERY LITTLE HAS BEEN DONE ON THE PROPERTY SINCE 1902 AND WORKINGS WERE CAVED AND INACCESSIBLE IN SEPTEMBER, 1954.
Comment Type:
Deposit
Comment VEIN
Comment Type:
Geology
Comment GEOL.DESC: SERPENTINE IS NEAR SLATE. LOW GRADE ORE ALSO FOUND AS PYRITIC IMPREGNATIONS IN SERPENTINE WALL ROCK ADJACENT TO THE VEIN.
Comment Type:
Deposit
Comment PATENTED LAND. THIS MINE IS THE MOST NORTHERLY MINE IN THE MARY HARRISON GROUP WHICH IS ALIGNED ON A BRANCH OF THE MOTHER LODE VEIN SYSTEM COMMONLY CALLED THE EAST BRANCH.


References

Reference Category:
Deposit
Pages:
Reference: BOWEN, O. E., JR., & GRAY, H., JR., 1957 , MINES AND MINERAL DEPOSITS OF MARIPOSA COUNTY, CALIF.: CALIF. JOUR. MINES & GEOL., VOL. 53 , NOS. 1 & 2 , P. 78 - 79 , 241 .
URL:
Reference Category:
Deposit
Pages:
Reference: RANSOME, F. L., 1900 , MOTHER LODE DISTRICT FOLIO: USGS GEOL. ATLAS OF THE US, FOLIO 63 , CLAIM SHEET 2 , SEC 4 (LOC.).
URL:
Reference Category:
Production
Pages:
Reference: BOWEN AND GRAY, 1957 .
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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