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Norcross Mine

Past Producer in San Luis Obispo county in California, United States with commodity Chromium
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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. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Ore body information
  12. Economic information about the deposit and operations
  13. Land status
  14. Ownership information
  15. Workings at the site
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10043679
MRDS ID M100578
Record type Site
Current site name Norcross Mine

Geographic coordinates

Geographic coordinates: -120.74404, 35.40358 (WGS84)
Elevation 366
Relative position APPROX. 16 MILES NW OF SAN LUIS OBISPO, CA.

Site location context

Political divisions (FIPS codes)

San Luis Obispo(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Atascadero(quadrangle 1:24,000 scale)

San Luis Obispo(quadrangle 1:100,000 scale)

San Luis Obispo(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Central Coastal(hydrologic unit)

Central California Coastal(hydrologic accounting unit)

Central California Coastal(hydrologic subregion)

California(hydrologic region)

Federal lands

Los Padres 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 San Luis Obispo

Public Land Survey System information

Meridian Township Range Section Fraction State
029S;029S;029S 011E;011E;011E 13;13;13 NW OF NW OF SE California

Comments on the location information

  • LOCATED ON SW SLOPE OF SANTA LUCIA RANGE NEAR HEAD OF A BRANCH OF SAN BERNARDO CREEK. ; INFO FROM LAND.ST :(1975)

Commodities

Commodity Importance
Chromium Critical Primary

Comments on the commodity information

  • LUMP ORE AVG. 43.6% CR2O3, 11% FE, CR TO FE RATIO 2.7

Materials information

Materials Type of material
Chromite Ore

Alteration

  • (Local) Serpentinization Of Dunite

Analytical data

Result CONCENTRATES AVG. 45% CR2O3, 13.3% FE, CR TO FE RATIO 2.4.

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Serpentinite
    Rock unit name Franciscan;Monterey
    Rock description Franciscan;Monterey

Nearby scientific data

(1) -120.74404, 35.40358
ListMap

Economic information

Ore body information

  • General form LENSE
  • General form LENSE

Comments on the geologic information

  • THE NORCROSS MINE IS LOCATED IN A MASSIVE LANDSLIDE BLOCK ALSO CONTAINING ULTRAMAFIC INTRUSIVES, MARINE SEDIMENTS OF THE MONTERY FM., AND GREENSTONE OF THE FRANCISCAN FM.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1915
Year of last production 1958

Land status

Ownership category National Forest

Ownership information

  • Type Operator
    Owner Henry C. Dalessi
    First year 1957
    Last year 1958

Workings at the site

  • Type of workings Surface
    Overall depth 45.72M
    Overall length 609.6M
    Overall width 304.8M

Comments on the workings information

  • WORKINGS CONSISTED (1975) OF A SERIES OF COAL ESCING OPEN PITS TRENDING W OF NS WITH A NUMBER OF SMALLER PITS AND WORKINGS SURROUNDING THE LARGER PIT

Comments on development

  • NORCROSS MINE WAS OPERATED ONLY DURING THE TWO WORLD WARS AND THE 1950'S.

Reference information

Bibliographic references

  • Deposit

    STINSON, M.C., 1975, CDMG MINERAL PROPERTY REPORT, UNPUBLISHED

  • Production

    STINSON, M.C., 1975

General comments

Subject category Comment text
Deposit NO ORE SEEN IN PLACE WHEN MINE WAS VISITED IN 1975.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1982 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.