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Keystone

Past Producer in Shasta county in California, United States with commodities Copper, Zinc, Silver, Gold
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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. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Workings at the site
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10077589
MRDS ID W025291
Record type Site
Current site name Keystone
Related records 10214011

Geographic coordinates

Geographic coordinates: -122.50499, 40.72096 (WGS84)
Elevation 914
Relative position 4 1/2 MILES W. OF SHASTA DAM

Site location context

Political divisions (FIPS codes)

Shasta(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Whiskeytown(quadrangle 1:24,000 scale)

Redding(quadrangle 1:100,000 scale)

Redding(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Sacramento Headwaters(hydrologic unit)

Upper Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Federal lands

Shasta-Trinity 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 Shasta

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 033N 006W 14 California

Commodities

Commodity Importance
Copper Primary
Zinc Critical Secondary
Silver Secondary
Gold Secondary

Comments on the commodity information

  • COPPER RICH ORE OCCURS IN SEPERATE, TABULAR BODIES AND AS PART OF LARGE PYRITIC MASSES.

Materials information

Materials Type of material
Chalcopyrite Ore

Mineral occurrence model information

Model code 184
USGS model code 28a
Deposit model name Massive sulfide, kuroko
Mark3 model number 93

Host and associated rocks

  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Rock unit name Balaklala Rhyolite
    Rock description Balaklala Rhyolite
    Stratigraphic age (youngest) Late Devonian
    Stratigraphic age (youngest) Late Devonian

Nearby scientific data

(1) -122.50499, 40.72096
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Steep Faults Have Been Found To Terminate Some Of The Massive Sulfide Bodies, Suggesting Possible Feeder Channels For Ore Solutions.

Ore body information

  • General form TABULAR
    Thickness 15.24M

Controls for ore emplacement

  • Contact Between Upper And Middle Units Of The Balakala Rhyolite. No Horizontal Controls Are Known.

Comments on the geologic information

  • GEOL.DESC: ORE BODY IS OVERLAIN BY A GENTLY DIPPING CONTACT BETWEEN UPPER AND MIDDLE UNITS OF THE BALAKALA RHYOLITE, NEAR THE PORTAL IS THE UPPER PART OF THE MIDDLE UNIT, AS COURSE PHENOCRYST TUFF THAT CONTAINS A FEW BODIES OF MASSIVE COURSE PHENOCRYST RHYOLITE.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Medium
Significant No
Production years 1923 - 1925

Mining district

District name West Shasta Copper - Zinc

Comments on the production information

  • 122,000 TONS MINED - ORE AVERGED 6 % CU, 8 % ZN, 2.7 OZ/TON AG, .06 OZ/TON AU, 30 % FE, 35 % S, AND 15 % INSOLUBLE MATERIAL.

Workings at the site

  • Type of workings Underground
    Length 609.6M

Comments on the workings information

  • 2 ADITS, DRIFTS AND CROSSCUTS

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit ORE WAS SUBDIVIDED ON BASIS OF COPPER CONTENT - BOTH TYPES ARE MASSIVE SULFIDE BODIES, ORE BODIES ARE LOCATED IN A PRODUCTIVE ZONE 300 FT. THICK, IMMEDIATELY BELOW BASE OF UPPER UNIT IN THE BALAKLALA RHYOLITE.
Deposit PORTALS OF THE MAIN ADITS ARE CAVED

Reporter information

Type Date Name Affiliation Comment
Reporter 01-APR-1978 Fraticelli, L. A. (Albers, J.) U.S. Geological Survey

Beyond USGS

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

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.