The Long Ledge No. 1 Long Ledge Group is a chromium mine located in Fresno 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
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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.
Long Ledge No. 1 Long Ledge Group MRDS details
Site Name
Primary: Long Ledge No. 1 Long Ledge Group
Secondary: Wood's Grizzly Bear Mine
Commodity
Primary: Chromium
Location
State: California
County: Fresno
District: Watts Valley Area
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
Not available
Ownership
Not available
Production
Year: 1918
Time Period: 1915?-1918
Material type: ORE
Description: Cp_Grade: ^33% Cr2o3
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: Cascade-Sierra Mountains
Physiographic Section: Sierra Nevada
Mineral Deposit Model
Not available
Orebody
Form: LINEAR POD, LENS
Structure
Type: L
Description: A Shear Zone Trends N 15 W Through Deposit
Alterations
Alteration Type: L
Alteration Text: Serpentinization
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Chromite
Gangue: Talc
Comments
Comment (Production): NO MINING SINCE 1918.
Comment (Workings): WORKINGS CONSIST OF 2 COLINEAR OPEN CUTS, EACH 60 FT LONG. THE CUTS ARE 70 FT. APART ON A LINE N10W. BETWEEN THEM LIES A SMALL PROSPECT PIT AND SEVERAL PILES OF ORE. AT N END OF UPPER CUT THERE IS AN OPEN ADIT AND SHAFT.
Comment (Geology): THE CHROMITE DEPOSITS OF WATTS VALLEY OCCUR ON THE EASTERN LIMB OF A SYNCLINAL, NE PLUNGING ULTRAMAFIC SILL. THE EASTERN LIMB, KNOWN AS HOG MTN, IS A LITTLE OVER A MILE WIDE, WHILE THE WESTERN LIMB, WHICH FORMS RED MTN, AVERAGES 3 MILES WIDE. THE TWO LIMBS JOIN TO THE NW AND TOGETHER FORM A DISCONTINUOUS TRIANGULAR EXPOSURE OF PERIDOTITE 10 MILES LONG AND 8 MILES WIDE ACROSS THE BASE.
Comment (Reserve-Resource): RYHEARSON ESTIMATED BLOCK OF ORE 275 X 25 X 10 FT STILL REMAINS IN DEPOSIT AS MASSIVE AND DISSEMINATED CHROMITE.
References
Reference (Reserve-Resource): CDMG BULL 134, P. 93.
Reference (Production): STINSON, 1975, MINERAL PROPERTY REPORT, CDMG.
Reference (Deposit): STINSON, M.C., 1975, MINERAL PROPERTY REPORT, CDMG UNPUBLISHED REPORT.
Reference (Deposit): CDMG BULL 134, P. 91-93.
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.
