1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Kate Hardy

Past Producer in Sierra county in California, United States with commodities Gold, Silver, Lead
Map
XML
JSON
KML
B
Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Ore body information
  12. Economic information about the deposit and operations
  13. Workings at the site
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10086532
MRDS ID X025434
Record type Site
Current site name Kate Hardy
Alternate or previous names Derelict
Related records 10262502

Geographic coordinates

Geographic coordinates: -120.88853, 39.47794 (WGS84)
Elevation 1280

Site location context

Political divisions (FIPS codes)

Sierra(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Pike(quadrangle 1:24,000 scale)

Truckee(quadrangle 1:100,000 scale)

Chico(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Yuba(hydrologic unit)

Lower Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Federal lands

Tahoe National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States California Sierra

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 019N 010E 29,32 California

Comments on the location information

  • UTM ACC. NW 1/4 NW 1/4 29, ADIT ENTRANCE.

Commodities

Commodity Importance
Gold Primary
Silver Secondary
Lead Tertiary

Comments on the commodity information

  • 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.

Materials information

Materials Type of material
Gold Ore
Silver Ore
Quartz Gangue
Talc Gangue

Alteration

  • (Local) Carbonate

Analytical data

Result UP TO 4 % SULFIDES-CONCENTRATE

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Stratigraphic age (youngest) Late Permian
  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro
  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro
  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate
  • Host or associated Host
    Rock type Metamorphic Rock > Serpentinite
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Granite

Nearby scientific data

(1) -120.88853, 39.47794
ListMap

Economic information

Ore body information

  • Strike N 23 W
    Dip 78 W
    Thickness 16.76M

Comments on the geologic information

  • 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
  • CROSSES EARLIER STRUCTURE. LESS ALTERED THAN BRUSH CREEK MINE.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No

Comments on the production information

  • ONE OF THE EARLIEST DISCOVERED MINES. OPERATED INTERMITTENTLY. PRODUCTION OF AU ORE REPORTED IN 1949.

Workings at the site

  • Type of workings Surface/Underground
    Area 14.165HA
    Overall depth 76.2M

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit SHOOTS, VEIN, POCKET

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1979 Hayden, F. (Albers, J.) U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

External references

Maps centered on this site

Authoritative California resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.