The Fortner Ranch Prospect is a mine located in Calaveras county, California.
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.
Fortner Ranch Prospect MRDS details
Site Name
Primary: Fortner Ranch Prospect
Commodity
Tertiary: Manganese
Location
State: California
County: Calaveras
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Physiography
General Physiographic Area: Pacific Mountain System
Physiographic Province: Cascade-Sierra Mountains
Physiographic Section: Sierra Nevada
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Spessartite
Ore: Psilomelane
Ore: Pyrolusite
Comments
Comment (Location): LOCATED IN SW 1/4 SECTION 4
Comment (Geology): GEOL.DESC: THE MANGANESE IS CHIEFLY IN THE FORM OF PARTLY OXIDIZED BROWN MANGANESE GARNET, SPESSARTITE, OCCURING IN A BED OF MASSIVE METACHERT. THE METACHERT HAS BEEN RECRYSTALLIZED TO FINE-GRAINED GRAY QUARTZITE, AND IS CUT BY QUARTZ VEINS UP TO 3' THICK. GENERAL STRIKE IS N. 40-55 DEG. W., DIP NEARLY VERTICAL. BELT OF METACHERT EXTENDS ALONG THE STRIKE FOR AT LEAST 450'. ONE PIT, 6 BY 6 BY 6'; A SECOND PIT, 350' TO THE NW, 2 BY 2 BY 2'; TWO ADDITIONAL PITS 100' NW OF PIT NO. 2 SPESSARTITE IS COATED WITH BLACK MANGANESE OXIDES; PYROLUSITE AND PSILOMELANE.
References
Reference (Deposit): REPT. 21 , P. 163 ; COUNTY REPT. NO. 2 , P. 212 AND PL. D; USGS MR-23
Reference (Deposit): USBM R.I. 5579, P.22
Reference (Deposit): CALIF. B. 152, P. 42-43; B. 125, P. 106; B.76, P.31
Reference (Deposit): EC MINERAL MAP NO.5, 1943
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.
