Old Ironsides Prospect

The Old Ironsides Prospect is a mine located in San Diego county, California at an elevation of 3,199 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: Old Ironsides Prospect

Commodity

Tertiary: Nickel
Tertiary: Copper
Tertiary: Cobalt

Location

State: California
County: San Diego

Land Status

Land ownership: National Forest
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: Valle, Howard And Paul
Home Office: 2424 - 5th Avenue, San Diego, CA

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant: N

Physiography

General Physiographic Area: Pacific Mountain System
Physiographic Province: Lower California

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Late Cretaceous

Name: Diorite
Role: Associated
Age Type: Host Rock
Age Young: Late Cretaceous

Analytical Data

Analytical Data: AND 0.27 TO 0.65 PERCENT COPPER. SURFACE GOSSAN SAMPLES AVERAGE 0.5 PERCENT NICKEL.
Analytical Data: SAMPLES OF UNALTERED GABBRO, FROM DEPTH OF 160 FT FROM DIAMOND DRILL HOLE ASSAYED 0.77 PERCENT NICKEL, 1.46 PERCENT COPPER. GOSSAN FROM TRENCHES ASSAYED 0.11 TO 0.45 PERCENT NICKEL, 0.007 TO 0.35 PERCENT COBALT

Materials

Ore: Chalcopyrite
Ore: Pyrrhotite
Gangue: Hornblende
Gangue: Olivine
Gangue: Pyrite

Comments

Comment (Geology): GEOL.DESC: AREA UNDERLAIN BY GABBRO (SAN MARCOS OR CUYAMACA) UPON WHICH HAS DEVELOPED DARK BROWN GOSSAN THAT CROPS OUT OVER AREA 325 FT. LONG, AND ABOUT 50 FT. WIDE. EXPLORATION INDICATES DEPTH OF 60 FT,BELOW WHICH IS UNALTERED GABBRO. NICKEL AND COPPER-BEARING SULFIDES OCCUR SPARINGLY IN UNALTERED GABBRO, AND SEEM MORE PROMINENT IN GOSSAN. UNALTERED GABBRO CONTAINS PYRRHOTITE AND CHALCOPYRITE. GABBRO INTRUDED INTO LARGER QUARTZ DIORITE BODY.

Comment (Deposit): DEPOSIT EXPLORED IN 1954 UNDER DMEA CONTRACT BY TWO DIAMOND-DRILL HOLES, EACH 300 FT. DEEP.

Comment (Location): LOCATED IN NW 1/4 , SW 1/4 , SECTION 6

Comment (Reserve-Resource): SMALL TONNAGE OF MATERIAL INFERRED TO BE PRESENT IN DEPOSIT TO A DEPTH OF 100 FT.

References

Reference (Deposit): CORNWALL, H. R., 1966, USGS BULL. 1223, P. 41.

Reference (Deposit): WEBER, F.H., JR., 1963 , GEOLOGY AND MINERAL RESOURCES OF SAN DIEGO COUNTY, CALIF: CALIF. D.O.M. AND GEOL., COUNTY REPT. 3

Reference (Deposit): CHESTERMAN, C.W., 1976 , WRITTEN COMMUNICATION

Reference (Reserve-Resource): REFER. (1)

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.