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

Copsey Claims

Producer in Lake county in California, United States with commodity Chromium
Map
XML
JSON
KML
C
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. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Mining district
  13. Ownership information
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10043527
MRDS ID M100305
Record type Site
Current site name Copsey Claims
Alternate or previous names Manzanita, Mint, Uncle Josh Claims

Geographic coordinates

Geographic coordinates: -122.64163, 38.83821 (WGS84)
Relative position FOR UTM ASSUMED A CENTER POINT ON BOUNDARY OF SECTIONS 4 AND 33.

Site location context

Political divisions (FIPS codes)

Lake(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Whispering Pines(quadrangle 1:24,000 scale)

Healdsburg(quadrangle 1:100,000 scale)

Santa Rosa(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Lake

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 011N;012N 007W;007W 04;33 N2 (04); SW (33) California

Comments on the location information

  • WORKINGS ARE 1/4 TO 1 1/4 FROM MAIN ROAD AT A POINT 7 MILES NORTH OF MIDDLETOWN AND 23 MILES NORTH OF CALISTOGA.

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Serpentinite

Nearby scientific data

(1) -122.64163, 38.83821
ListMap

Economic information

Ore body information

  • General form LENSE, POD OTHER STRINGERS
    Strike N-S
    Dip 40S

Comments on the geologic information

  • SERPENTINE BLET EXTENDS N65W FROM NORTHERN HALF OF SEC. 4, T.11N, R.7W INTO SW QUARTER OF T.12N, R.7W.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Small
Significant No
Discoverer Arthur Copsey
Year of first production 1917

Mining district

District name Western Group Of Lake County

Ownership information

  • Type Owner
    Owner Copsey, Arthur
    Home office Middletown, Ca.

Comments on the production information

  • PRODUCTION FROM MANZANTIA CLAIM

Comments on the workings information

  • WORKINGS CONSISTED OF SEVERAL TRENCHES AND TUNNELS ON THE MANZANITA AND UNCLE JOSH CLAIMS. LITTLE WORK WAS DONE ON THE MINT CLAIM.

Reference information

Bibliographic references

  • Deposit

    DOW, D.H. AND THAYER, T.P., 1946, GEOLOGICAL INVESTIGATIONS OF CHROMITE IN CALIF.: CALIF. DIVISION OF MINES BULLETIN 134, PART 2, CHAPT. 1, P 11,12,32.

  • Deposit

    LOGAN, C.A., 1918, CHROMIUM IN BRADLEY, W.W., AND OTHERS, MANGANESE AND CHROMIUM IN CALIF.: CALIF. STATE MINING BUREAU BULLETIN NO. 76, P. 148,149,219.

General comments

Subject category Comment text
Deposit ARTHUR COPSEY LEASED SHARED TO W.P. MOORE AND JOSHUA SPIERS. BLACK CHROMITE SAND VERY ABUNDANT ON ALL THREE CLAIMS, ESPECIALLY IN WATER COURSES. STRINGERS VARY FROM 2 INCHES TO 1 FOOT IN WIDTH.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1981 Oster, Karel L. (Albers, John P.) 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.