The Penn is a copper and zinc mine located in Calaveras county, California at an elevation of 325 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: 325 Feet (99 Meters)
Commodity: Copper, Zinc
Lat, Long: 38.23028, -120.87389
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.
Penn MRDS details
Site Name
Primary: Penn
Secondary: Campo Seco
Secondary: Copper Hill
Secondary: Hecla
Secondary: Hinckley
Secondary: Penn Chemical Works
Secondary: Satellite
Commodity
Primary: Copper
Primary: Zinc
Secondary: Silver
Secondary: Gold
Secondary: Lead
Location
State: California
County: Calaveras
Land Status
Not available
Holdings
Not available
Workings
Type: Surface/Underground
Ownership
Not available
Production
Year: 1952
Time Period: 1920-1952
Mined: 193.300 mt
Material type: Ore
Description: Cp_Grade: ^196.413 Tons Ore
Year: 1952
Time Period: 1943-1952
Mined: 190275.380 mt
Material type: Ore
Description: Cp_Grade: ^193,330 Tons Ore
Year: 1952
Time Period: 1861-1952
Mined: 958398.210 mt
Material type: Ore
Description: Cp_Grade: ^973,784 Tons Ore
Deposit
Record Type: Site
Operation Category: Past Producer
Deposit Type: Replacement
Operation Type: Unknown
Year First Production: 1861
Year Last Production: 1959
Discovery Year: 1861
Years of Production:
Organization:
Significant: N
Deposit Size: L
Physiography
General Physiographic Area: Pacific Mountain System
Physiographic Province: Cascade-Sierra Mountains
Physiographic Section: Sierra Nevada
Mineral Deposit Model
Model Name: Massive sulfide, kuroko
Orebody
Form: LENTICULAR
Structure
Type: L
Description: Faults; 3 Categories 1. Generally Steeply Dipping Faults, Strike Ne, Little Effect On Ore Body 2. Low-Angle Reverse Faults, N 30 W - N 30 E, 25 - 55 E 3. High-Angle, Along Certain Schistosity Planes Or At Contacts. Folds Plunge From 60 S - 85 N, Schistosity And Cleavage In Most Rocks - Schistosity Parallel To Bedding Dips Eastward 5 - 15 Degrees.
Alterations
Alteration Type: L
Alteration Text: Zones Of Sericitization, Silicification And Pyritization As Belts And Lenses In Metavolcanic And Intrusive Rocks.
Rocks
Name: Greenstone
Role: Host
Age Type: Host Rock
Age Young: Late Jurassic
Name: Greenstone
Role: Host
Age Type: Host Rock Unit
Age Young: Late Jurassic
Analytical Data
Not available
Materials
Ore: Galena
Ore: Bornite
Ore: Malachite
Ore: Chalcocite
Ore: Copper
Ore: Chrysocolla
Ore: Gold
Ore: Tetrahedrite
Ore: Sphalerite
Ore: Chalcopyrite
Ore: Pyrite
Ore: Covellite
Gangue: Sericite
Gangue: Chlorite
Gangue: Barite
Gangue: Selenite
Gangue: Calcite
Gangue: Quartz
Comments
Comment (Workings): DEVELOPED BY AT LEAST 20 SHAFTS, SIX ARE NUMBERED, 42,000 FT. IN DRIFTS AND CROSSCUTS, OVER 13,000 FT. IN SHAFTS AND RAISES.
Comment (Geology): GEOL.DESC: METAMORPHIC ROCKS CONSISTS OF THICK SEQUENCE OF METAVOLCANIC AND METASEDIMENTARY ROCKS WHICH ARE INTRUDED BY VARIOUS INTRUSIVE ROCKS. UNDERNEATH MINE AREA IS MARIPOSA SLATE AND VOLCANIC ROCKS ASSIGNED TO AMADOR GROUP. BEDDING AND LAYERING DIP STEEPLY NE AND STRIKE NW. IN GENERAL SCHISTOSITY AND CLEVAGE ARE PARALLEL TO BEDDING. HIGHER HILLS; TERTIARY AURIFEROUS GRAVEL RESTS ON UNCONFORMITY WHICH DIPS GENTLY WESTWARD. ANOTHER GRAVEL, GENERALLY AURIFEROUS, INTERBEDDED WITH VOLCANIC ASH LIE ON BENCHES DEVELOPED ON UNWEATHERED ROCKS, LESS THAN 100 FT. ABOVE PRESENT RIVER LEVEL.
Comment (Deposit): GOSSAN FOUND ALONG OUTCROPS OF ORE BODIES CONTAIN; MALACITE, AZURITE, JAROSITE, LIMONITE AND KAOLIN. ORE BODIES LONG AXES PLUNGE STEEPLY NORTHWARD OR SOUTHWARD.
Comment (Production): AVG. GRADE ORE 1903 - 1919 ; CU 4.85 %, AU .07 OZ/TON, AG 2.32 OZ/TON. AVG. GRADE ORE 1943 - 46 ; CU 2.05 %, PB 5.58 %, ZN 7.89 %, AU .07 OZ/TON, AG 2.37 OZ/TON 1868 - 1882 MINE WAS BELIEVED TO BE INACTIVE.
References
Reference (Deposit): CLARK, W. B., AND LYDON, P. A., 1962 , MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY, CALIFORNIA; COUNTY REPT. 2 ; CALIF. DIV. MINES AND GEOLOGY, P. 28 - 31
Reference (Deposit): HEYL, G. R., COX, M. W. AND ERIC, J. H., 1948 , PENN ZINC-COPPER MINE, CALAVERAS COUNTY, CALIFORNIA; COPPER IN CALIFORNIA BULL. 144 ; DIV. OF MINES, P. 61 - 84
Reference (Production): CLARK, W. B. & LYDON, P. A., 1962 , (SEE REF.)
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.
