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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. Nearby scientific data
  9. Ore body information
  10. Economic information about the deposit and operations
  11. Mineral rights holdings
  12. Ownership information
  13. Production statistics
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10140976
MRDS ID W025010
MAS/MILS ID 0060790031
Record type Site
Current site name Norcross Mine
Alternate or previous names Norcross Chrome Mine, Biaggini Mine, Sunrise # 3 Claim
Related records 10077398

Geographic coordinates

Point of reference Trench
Geographic coordinates: -120.74408, 35.40357 (WGS84)
Elevation 366
Location accuracy 100(meters)

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
Mount Diablo 029 S 011 E 13 NWNWSE California

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Unknown
Serpentine Unknown

Nearby scientific data

Trench (1) -120.74408, 35.40357
ListMap

Economic information

Ore body information

  • Strike N30E
    Dip 90N
    Thickness 3M
    Length 33M
    Width 7M
    Depth to top 0M
    Field Value
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 TABULAR
    Shape of Orebody #2 IRREGULAR
    Primary mode of Origin MAGMATIC DIFFER
    Primary Ore Control LITHOLOGY
    Secondary Ore Control FAULTING
    Degree of Wallrock Alter. INTENSE
    Type of Wallrock Alter. #1 CARBONITIZATION
    Strike And Dip N30E:90N
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 0
    Min. Thick. Unconsol. Mat. 0
    Date of Last Modification 820524

Economic information about the deposit and operations

Operation type Surface
Development status Past Producer
Commodity type Metallic
Significant No
Discovery year 1875
Year of first production 1917

Mineral rights holdings

Type of mineral rights Other
Type of mineral rights Located Claim
Type of mineral rights Private Lease

Ownership information

  • Type Owner
    Owner Del Norte Chrome Ltd.
    Interest 100
    Home office California
    Year 1987

Production statistics

  • Year 1917
    Description Concentrates Produced From 1917-1918 630 Mt @ 44 Pct
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Chromium Chromium 630mt 44wt-pct
  • Year 1917
    Description Lump Ore Mined 170 Mt
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Chromium Chromium 170mt
  • Year 1917
    Description Ore Mined From 1917-1918 4080 Mt
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Chromium Chromium 4080mt
  • Year 1943
    Description Lump Ore Mined From 1943-1944 370 Mt @ 39 Pct With A 2.3:1
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Chromium Chromium 370mt 39wt-pct
  • Year 1954
    Description Ore Mined From 1954-1958 26300 Mt
  • Year 1954
    Description Lump Ore Mined From 1954-1958 450 Mt @ 43.6 Pct-2.7:1 Cr:Fe
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Chromium Chromium 450mt 44wt-pct
  • Year 1954
    Description Concentrates Produced From 1954-1958 9700 Mt @ 45 Pct-2.4:1 Cr:Fe
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Chromium Chromium 9700mt 45wt-pct

Comments on the production information

  • TOTAL PRODUCTION (OF CONCENTRATES 44 PERCENT CR2O3) PRIOR TO S 2500 TONS ORE RAN 15 PERCENT CR2O3, CR/FE=2.3 INSUFFICIENT DATA FOR MATRIX CALCULATIONS. ANALYSIS BY CDMG IN 1976 GAVE FOLLING PERCENTAGES-DISSEMINATE S102 04.33, CR2O3 53.35, FEO 11.07, TOTAL FE 13.51, AL203 12.28, 84, CR/FE 3.48.

Comments on the reserve resource information

  • MAT 1 COL 1 REPRESENTS TOTAL RESOURCES. MAT 1 COL 2 REPRESENTS UPPER PIT ORE. MAT 1 COL 3 REPRESENT UPPER-MIDDLE EXTEN. MAT 1 COL 4 REPRESENTS MIDDLE PIT ORE. MAT 1 COL 5 REPRESENTS MIDDLE-LOWER EXTEN. MAT 1 COL 6 REPRESENTS LOWER PIT HG ORE. MAT 1 COL 7 REPRESENTS LOWER PIT LG ORE. MAT 1 COL 8 REPRESENTS LOWER PIT LANDSLIDE RUBBLE.

Workings at the site

  • Type of workings Surface
    Area 20HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Mining Method OPEN PIT
    Avg. Overburden Thickness 0
    Avg. Bench Height (meters) 10
  • Type of workings Underground
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1

Reference information

Bibliographic references

  • Deposit

    CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD, CENTRAL

  • Deposit

    COAST REGION. SURFACE WATER DEGRADATION BY INACTIVE

  • Deposit

    METAL MINES IN NORTHWEST SAN LUIS OBISPO COUNTY, CA,

  • Deposit

    DECMEBER 1993 (P. 6-8).

  • Deposit

    CALIF. STATE MINING BUR. BULLETIN 76, 1918, P. 174.

  • Deposit

    CALIF. JOUR. MINES AND GEOL. V. 37, 1941, P. 143.

  • Deposit

    U.S. GEOLOGICAL SURVEY BULLETIN 945-B, 1944, P. 37-38.

  • Deposit

    CALIF. DIV. MINES BULLETIN 134, 1953, PART II, CHAPT. 2,

  • Deposit

    P. 65-67.

General comments

Subject category Comment text
Environmental Factors CHROMITE DEPOSITS IN THE CHORRO CREEK WATERSHED ARE NOT SULFIDES WITH POTENTIAL TO GENERATE ACID MINE DRAINAGE THOUGH THEY MAY ERODE CHROMIUM, ALUMINUM, MAGNESIUM, IRON, MANGANESE, TITANIUM, CALCIUM, SILICON, AND NICKEL TO THE WATERSHED. METALS WHICH APPEAR TO BE ERODING FROM INACTIVE MINES INCLUDE MAGNESIUM, IRON, NICKEL, AND CHROMIUM. SAN LUISITO CREEK, PENNINGTON CREEK, AND UPPER CHORRO CREEK APPEAR TO BE THE MOST HEAVILY MINE-IMPACTED TRIBUTARIES IN THE CHORRO CREEK WATERSHED.

Reporter information

Type Date Name Affiliation Comment
Reporter 05-DEC-1994 Wetzel, Nicholas 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.