The Madeira Claim is a chromium mine located in Sonoma county, California at an elevation of 1,401 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: 1,401 Feet (427 Meters)
Commodity: Chromium
Lat, Long: 38.59333, -123.01028
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.
Madeira Claim MRDS details
Site Name
Primary: Madeira Claim
Commodity
Primary: Chromium
Location
State: California
County: Sonoma
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
Owner Name: George Madeira, Healdsburg
Years: 1916 -
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Year Last Production: 1916
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
Form: LENSE
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Analytical Data: ORE CONTAINED 34% CR2O3
Materials
Ore: Chromite
Comments
Comment (Production): NO RECORD THAT ORE WAS SHIPPED
Comment (Workings): WORKINGS CONSISTED OF SEVERAL OPEN CUTS AND TRENCHES.
Comment (Deposit): DEPOSIT CONSISTS OF SEVERAL SMALL LENSES ALONG THE SUMMIT OF A RIDGE. THE PROPERTY COMPRISES 40 ACRES.
References
Reference (Deposit): LOGAN, C.A., 1918, CHROMIUM, IN BRADLEY, W.W., AND OTHERS, MANGANESE AND CHROMIUM IN CALIFORNIA: CALIF. STATE MINING BUREAU BULLETIN NO. 76, P. 201.
Reference (Deposit): DOW, D.H. AND THAYER, T.P., 1946, GEOLOGICAL INVESTIGATIONS OF CHROMITE IN CALIF.: CALIF. DIVISION OF MINES BULLETIN 134 PART 2, CHAPT. 1, P 27, 36.
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.
