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.
Name: Oro Grande Mining Co.
Elevation: 4,049 Feet (1,234 Meters)
Lat, Long: 41.27111, -122.82333
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Oro Grande Mining Co. MRDS details
Primary: Oro Grande Mining Co.
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.
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Deposit Size: S
General Physiographic Area: Pacific Mountain System
Physiographic Province: Pacific Border Province
Physiographic Section: Klamath Mountains
Mineral Deposit Model
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)
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.
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)
"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 at Where to Find Gold in California.