The La Primera is a chromium mine located in San Luis Obispo county, California at an elevation of 1,348 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: 1,348 Feet (411 Meters)
Commodity: Chromium
Lat, Long: 35.35861, -120.68667
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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.
La Primera MRDS details
Site Name
Primary: La Primera
Secondary: Hardface Group 1950's
Commodity
Primary: Chromium
Location
State: California
County: San Luis Obispo
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
Type: Surface
Ownership
Owner Name: Mineral Rights Held By Arther E. Schwartz
Home Office: C/O K. Pierce, Trinidad Mining Co., Inc., 434 Monterey St, Morro Bay, Ca. 93442
Owner Name: Pierce Brothers, Morro Bay, Ca.
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1885
Year Last Production: 1958
Discovery Year: 1885
Discovery Method: 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
Physiographic Detail: Santa Lucia Range
Mineral Deposit Model
Not available
Orebody
Form: LENSE
Form: LENSE
Structure
Type: R
Description: Volc. And Sed. Rocks Folded Into Syncline
Alterations
Not available
Rocks
Not available
Analytical Data
Analytical Data: CONCENTRATES (1950'S) AVERAGED 45.8% CR2O3, 13.2% FE, CR TO FE RATIO 2.3.
Materials
Ore: Chromite
Comments
Comment (Commodity): LUMP ORE (1950'S) AVERAGED 44.6% CR2O3, 11% FE, CR TO FE RATIO 2.6
Comment (Location): MINE LOCATED ON SMALL SPUR HEADING SOUTH OFF THE SANTA LUCIA RANGE. ; INFO FROM LAND.ST :(1975)
Comment (Workings): WORKINGS SEEN IN 1975 CONSISTED OF A LARGE PIT AND EXISTANCE DUMPS.
Comment (Deposit): Discovery Year: 1880'S
Comment (Deposit): A 0.2 M THICK LAYER OF MASSIVE CHROMITE EXPOSED IN PIT FLOOR AND WALLS.
Comment (Geology): ULTRAMAFIC AND DIABASE INTRUSIVE BODIES USUALLY 4-5 KM LONG AND 1 KM THICK, ARE ELONGATE, AND NW-SE TRENDING. ULTRAMAFIC BODY CONTAINING MOST OF CHROMITE EXPOSED CONTINUOUSLY FOR 16 KM.
References
Reference (Deposit): STINSON, M.C., 1975, CDMG MINERAL PROPERTY REPORT, UNPUBLISHED
Reference (Production): CDMG MINERAL PROP. REPORT, UNPUBLISHED.
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.
