Kate Hardy

The Kate Hardy is a gold mine located in Sierra county, California at an elevation of 4,199 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

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.

Site Name

Primary: Kate Hardy
Secondary: Derelict

Commodity

Primary: Gold
Secondary: Silver
Tertiary: Lead

Location

State: California
County: Sierra

Land Status

Not available

Holdings

Not available

Workings

Type: Surface/Underground

Ownership

Not available

Production

Not available

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

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Carbonate

Rocks

Name: Diorite
Role: Associated
Age Type: Host Rock
Age Young: Late Permian

Analytical Data

Analytical Data: UP TO 4 % SULFIDES-CONCENTRATE

Materials

Ore: Silver
Ore: Gold
Gangue: Quartz
Gangue: Talc

Comments

Comment (Geology): VEIN IN BLACK SLATE, CUT BY DIKES OF GABBRO & SERPENTINE POST MINERAL VERT FAULT W 25-30 FT OFFSET, TO N. FURTHER S IT MAY COMPLETELY CUT OFF THE VEIN. SLATE IS MAINLY FISSILE, FINE-GRAINED. VEIN LENSES OF QUARTZITE. CLOSE TO VEIN A MASSIVE GREEN ROCK, TUFF? OR FINE GRAINED GABBROIC DIKE? THE SERPENTINE MASS CROSSING ENTIRE DISTRICT IS HERE 100-200 FT E, & SMALL DIKES FROM IT EXTEND NEARLY TO VEIN. LARGEST GABBROIC DIKE CROSSES SLATE & SERPENTINE & GRADES IN SHORT DISTANCE FROM OLIVINE GABBRO TO DIORITE W PORPHYRITIC PHASE CONTAINING ORTHOCLASE. 3 OUT CROPS OF ACIDIC INTRUSIVES: APLITE DIKE 4 TO 8 FT THICK; PYRITIZED GRANITE OF MAINLY QTZ & ORTO CLASE. VEIN CUTS SLATE AT SMALL ANGLE & IS TRACABLE 1000 FT NEARLY TO LAUA CONTACT. QTZ FLOAT INDICATES N EXTENSION FOR ABOUT 1200 FT OF VEIN. VEIN CHANGES TO ZONE OF QTZ STRINGERS & SILICIFIED SLATE 100 FT THICK. EARLY MOVEMENT REVERSED, GROOVING PITCHES A FEW DEGREES S OF DIP. RIBBON STRUCTURE DUE TO SUCCESSIVE FISSURING. LATER QTZ VEINING

Comment (Geology): CROSSES EARLIER STRUCTURE. LESS ALTERED THAN BRUSH CREEK MINE.

Comment (Production): ONE OF THE EARLIEST DISCOVERED MINES. OPERATED INTERMITTENTLY. PRODUCTION OF AU ORE REPORTED IN 1949.

Comment (Deposit): SHOOTS, VEIN, POCKET

Comment (Commodity): LG NUMBER OF SMALL BUNCHES OF HIGH GRADE ORE. HIGH GRADE SHOOTS GENERALLY VERT & END AGAINST PROMINENT SHEETING ZONES WHICH GENERALLY DIPS LESS THAN 10 N, AND IS ASSOC W. COARSE-GRAINED ARSENOPYRITE, AND IS MORE LIKELY TO BE HIGH GRADE WHERE IT APPROACHES SERPENTINE.

Comment (Location): UTM ACC. NW 1/4 NW 1/4 29, ADIT ENTRANCE.

References

Reference (Deposit): FERGUSON, H. G., & GANNETT, R. W., 1932 , GOLD QTZ VEINS OF THE ALLEGHANY DISTRICT, CALIF.;: USGS PROF PAPER 172, P 89, 91, SKETCH MAP P 90.

Reference (Deposit): LOGAN, C. A., 1929 , SIERRA CO.: CDMM 25TH REPORT STATE MINERALOGIST, APRIL, P 178.

Reference (Deposit): USBM MINERAL REPORT, 1949, P

Reference (Deposit): AVERILL, C. V., 1942 , MINES AND MINERAL RESOURCES OF SIERRA CO.: CDM CALIF. JOUR. MINES AND GEOL, VOL 38, NO 1, P 58.

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.