The J.M. Macdonough Ranch is a gold mine located in San Mateo county, California at an elevation of 469 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
Elevation: 469 Feet (143 Meters)
Commodity: Gold
Lat, Long: 37.39278, -122.23472
Map: View on Google Maps
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.
J.M. Macdonough Ranch MRDS details
Site Name
Primary: J.M. Macdonough Ranch
Commodity
Primary: Gold
Secondary: Silver
Tertiary: Lead
Location
State: California
County: San Mateo
Land Status
Land ownership: Private
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: California Coast Ranges
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Oxidation
Rocks
Name: Serpentinite
Role: Host
Age Type: Host Rock
Age Young: Late Jurassic
Analytical Data
Analytical Data: SAMPLES ASSAYED 0.03 OZ AU/TON, 1.10 OZ AG/TON AND 0.8% PB
Materials
Ore: Gold
Comments
Comment (Deposit): WORKED OCCASIONALLY FROM EARLY 1870'S TO AROUND 1915. INVESTIGATIONS AROUND 1955 PROVED IT TO BE OF NO COMMERCIAL VALUE ; INFO.SRC : 1 PUB LIT
Comment (Location): UTM EST. LAND UNSURVEYED FOR TOWNSHIP-RANGE AND SECTION. EST. FROM TOPO.
Comment (Deposit): VEIN, 30 IN. THICK. OUTCROPS ON STANFORD ESTATE TO SOUTH OCCURS IN BRECCIATED ZONE OF THE SAN ANDREAS FAULT ZONE CONSISTING OF SERPENTINE. WALL ROCKS ARE JASPER & SANDSTONE.
Comment (Workings): PITS AND TRENCHES.
References
Reference (Deposit): DAVIS, F.F., 1955, MINES AND MINERAL RESOURCES OF SAN MATEO COUNTY, CALIF.: CALIF. JOUR. MINES & GEOLOGY V. 51, NO. 4, P. 413
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.
