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

Negrohead

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. Nearby scientific data
  9. Ore body information
  10. Economic information about the deposit and operations
  11. Mining district
  12. Land status
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10043655
MRDS ID M100474
MAS/MILS ID 0060790193
Record type Site
Current site name Negrohead
Alternate or previous names Blackhead Claim, Niggerhead

Comments on the site names

  • The original site name contained a derogatory word that has been changed according to Department of the Interior policy outlined at http://geonames.usgs.gov/docs/pro_pol_pro.pdf. See Chap. 3, Policy V. The revised form of the name now appears in the permanent record as the "Current" or preferred site name, and the prior, derogatory name is labeled "Previous".

Geographic coordinates

Point of reference Trench
Geographic coordinates: -120.7068, 35.36608 (WGS84)
Relative position ASSUMED SPOT AT CENTER OF NE 1/4 SECT. 32

Site location context

Political divisions (FIPS codes)

San Luis Obispo(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

San Luis Obispo(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

ST(Federal land areas administered by ST)

Geographic areas

Country State County
United States California San Luis Obispo

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 029S 012E 32 NE California

Commodities

Commodity Importance
Chromium Critical Primary

Comments on the commodity information

  • High Grade Ore

Materials information

Materials Type of material
Chromite Ore

Nearby scientific data

Trench (1) -120.7068, 35.36608
ListMap

Economic information

Ore body information

  • General form LENSE

Economic information about the deposit and operations

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

Mining district

District name Cerro Alto-Cuesta Pass Area

Land status

Ownership category National Forest

Comments on the production information

  • Production Was Less Than 150 Long Tons Of Ore

Comments on the workings information

  • Workings Consist Of Open Cuts Extending 200 Ft At N55w That Were Mined To A Depth Of 10-20 Ft.

Reference information

Bibliographic references

  • Deposit

    ALLEN, J.E., 1941, GEOL. INVESTIGATIONS OF CHROMITE DEPOSITS OF CALIF.: CALIF. JOURNAL OF MINES AND GEOLOGY, VOL 37, P. 162.

  • Deposit

    WALKER, G.W. AND GRIGGS, A.B., 1953, GEOL. INVESTIGATIONS OF CHROMITE IN CALIF.: CALIF. DIVISION OF MINES BULLETIN 134, PART II, CHAPT. 2, P. 83.

General comments

Subject category Comment text
General Doug Causey - Deleted DEP_ID 10262682, a duplicate record from MAS database. There were a few minor additions of information from that record, but basically this was a more complete description of the property.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-1981 Oster, Karel L. (Albers, John P.) U.S. Geological Survey
Reporter 21-AUG-1992 Ridenour, James U.S. Bureau of Mines

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.