Oro Grande Mining Co.

The Oro Grande Mining Co. is a gold mine located in Siskiyou county, California at an elevation of 4,049 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: Oro Grande Mining Co.
Secondary: McKeen
Secondary: Cummings
Secondary: Shasta

Commodity

Primary: Gold

Location

State: California
County: Siskiyou
District: Callahan

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

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Pacific Mountain System
Physiographic Province: Pacific Border Province
Physiographic Section: Klamath Mountains

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Analytical Data: MILL HEADS SAID TO AVG. $9.65/TON. ORE WAS SAMPLED FOR 400 FT. ON ADIT LEVEL 193 FT. HIGHER THAN LOWEST LEVEL. AVG. VALUES ASSAYED AT $7-$8/TON IN GOLD. DATA WENT INTO 1925 EST. OF RESERVES. (SEE TABLE)

Materials

Gangue: Quartz

Comments

Comment (Deposit): 480 ACRES. PATENTED. 200 ACRES HELD BY LOCATION ; INFO.SRC : 1 PUB LIT

Comment (Deposit): 4 VEINS, ONLY 1 DEVELOPED; FISSURE VEIN W/10% FILLING OF PYRITE. VEIN AVG. 2 FT. THICK. 3 PAY SHOOTS EACH 250 FT. LONG. NO. 1 ADIT IN SHOOT FOR LAST 75 FT. VEIN HAS GOUGE PARTING ON BOTH WALLS. BREAKS CLEAN OF COUNTRY ROCK WITHOUT DIFFICULTY IN SHRINKAGE STOPES. VEINS ON HILL TO NW OF MAIN WORKINGS OCCUR CLOSE TO SERPENTINE CONTACT, AS PIECES OF FLOAT FROM GRANODIORITE TO WHITE APLITIC-APPEARING MATERIAL W/SCATTERED CRYSTALS OF BIOTITE IS ENCOUNTERED.

Comment (Workings): 5 MAIN ADIT LEVELS. ON LOWEST OR NO. 1 ADIT LEVEL, 2825 FT. OF DRIFTS, ON NO. 2 LEVEL, 220 FT. ABOVE, 2300 FT. OF DRIFTS. RAISE CONNECTS 2 LEVELS AT POINT 1500 FT. FROM NO. 1 TUNNEL PORTAL. LEVELS ABOVE NO. 2 STOPED OUT AND CAVED BETWEEN NO. 1 AND NO. 2. NUMEROUS CUTS AND SMALL ADITS OR VEINS ON SLOPE OF HILL TO NW OF MINE. LOGAN (1925) EST. WORKINGS AT 3000 FT. ON VEIN, TOTAL FOOTAGE OF 8000 FT. OF TUNNELS AND 300 FT. OF RAISE, VERTICAL DEPTH REACHED OF 400 FT. BELOW OUTCROP.

Comment (Reserve-Resource): YEAR EST. FROM REFERENCE. OBRIEN STATES 25 TONS OF ORE, VALUED AT $12/TON, IS BLOCKED OUT. LOGAN STATES THAT PRODUCTION PREVIOUS TO ORO GRANDE MINING CO.'S OPERATIONS WAS ABOUT $500,000, FOR ABOUT ONE HALF OF WHICH THERE IS A DEFINITE RECORD, BUT NONE FOR PRODUCTS OF ARRASTRAS AND MILLING. 1931 EST. APPARENTLY A REFINEMENT OF 1925 VALUES.

Comment (Production): PRODUCTION YEARS EST. FROM REFERENCE. STATED THAT AN EQUAL AMOUNT OF ORE PROBABLY PRODUCED, BUT NOT RECORDED. NO OTHER INFORMATION FOUND.

References

Reference (Deposit): OBRIEN, J.C., 1947, MINES AND MINERAL RESOURCES OF SISKIYOU COUNTY, CALIFORNIA: CALIFORNIA JOURNAL OF MINES AND GEOLOGY, V.43, NO. 4, P. 447 PL. 42

Reference (Deposit): LOGAN, C.A., 1925, SACRAMENTO FIELD DIVISION: CALIFORNIA JOURNAL OF MINES AND GEOLOGY, VOL. 21, NO. 4, P. 453-454

Reference (Deposit): AVERILL, C.V., 1931, REDDING FIELD DIVISION: CALIF. JOUR. MINES & GEOLOGY V. 27, P. 48-49

Reference (Production): AVERILL (1931)

Reference (Reserve-Resource): AVERILL (1931) OBRIEN (1947) LOGAN (1925)

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.