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Porter Property

Past Producer in Nevada county in California, United States with commodities Chromium, Iron
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Geologic information

Identification information

Deposit ID 10159692
MRDS ID M011167
MAS/MILS ID 0060570287
Record type Site
Current site name Porter Property
Related records 10031745

Geographic coordinates

Point of reference Trench
Geographic coordinates: -121.08184, 39.25459 (WGS84)
Elevation 718
Location accuracy 100(meters)
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Geographic areas

Country State County
United States California Nevada

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 016 N 008 E 16 N2NWNE California

Commodities

Commodity Importance
Chromium Tertiary
Iron Tertiary

Materials information

Materials Type of material
Chromite Unknown
Olivine Unknown
Pyroxene Unknown
Serpentine Unknown

Nearby scientific data

Trench (1) -121.08184, 39.25459
ListMap

Ore body information

  • Strike N59W
    Dip 75W
    Thickness 0.1M
    Depth to top 0M
    Width 1M
    Length 40M
    Area 1HA
    Field Value
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 IRREGULAR
    Shape of Orebody #2 TABULAR
    Shape of Orebody #3 LENTICULAR
    Primary mode of Origin MAGMATIC DIFFER
    Primary Ore Control LITHOLOGY
    Secondary Ore Control FAULTING
    Degree of Wallrock Alter. INTENSE
    Type of Wallrock Alter. #1 OTHER
    Strike And Dip N59W
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 0
    Min. Thick. Unconsol. Mat. 0
    Total Surface Area (HA) 1
    Date of Last Modification 820510

Economic information

Economic information about the deposit and operations

Operation type Surface-Underground
Development status Past Producer
Commodity type Metallic
Significant No
Discovery year 1917
Year of first production 1918

Mining district

District name Nevada City

Mineral rights holdings

Type of mineral rights Fee Ownership

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner Ng,Fe,And Jl Wright, J And Jl Allen
    Interest 100
    Home office California
    Year 1976
  • Type Operator
    Owner Schmidt, A. J. (Last Operator)
    Home office California
    Year 1976
    First year 1918

Workings at the site

  • Type of workings Surface
    Area 1HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Mining Method OPEN PIT
    Swell Factor .6
    Avg. Overburden Thickness 0
    Hardness of Ore M-HARD ROCKS
  • Type of workings Underground
    Length 38M
    Overall depth 10M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Mining Method OPEN STOPE
    Swell Factor .6
    Hardness of Rock SOFT NONPLASTIC FISSURED MODERATE WATER
    Rock Characteristics MULTIPLE SYSTEMS OF WEAKNESS PLANES
    Rock Support Chars. UNSUPPORTING NO FLOW
    Mine Support Chars. TIMBER W/LAGGING CONCRETE-UNREINFOR
    Number of Shafts 2
    1st Condition of Workings CAVED AT PORTAL

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
U.S. Bureau of Mines Minerals Availability System MAS 0060570287
USGS Mineral Resources Data System MRDS M011167 MAS references MRDS

Bibliographic references

  • Deposit

    RYNEARSON, GA 1953, CR IN SIERRAS CMDG BULL 134, PT3, CHS, P

  • Deposit

    CAMERON,RC UNDATED,UNPUBL FIELD REPT,NEVADA CO NO. 202

General comments

Subject category Comment text
Deposit DISSEMINATED ORE WAS HAND SORTED TO MAKE PRODUCT AVERAGING 3 RCENT CR2O3 CR/FE NOT KNOWN MINE OPERATED ONLY IN 1918 -10 TONS OF ORE WERE MINED, BUT RECORDED SHIPMENTS TOTAL 893 LON MINE VISIT BY CDMG ON 5 JAN 1976 THE AVERAGE MINEABLE GRADE OF CHROMITE IS 32 PERCENT AND IRO PERCENT. INSUFFICIENT DATA FOR MATRIX CALCULATIONS. ANALYSIS BY CDMG IN 1976 GAVE FOLLOWING PERCENTAGES-MASSIVE 2 06.28,CR2O3 34.71,FEO 11.22,TOTAL FE 12.87,AL203 19.84,MGO CR/FE 2.38.DISSEMINATED ORE=S102 06.08,CR2O3 34.71,FEO 14.02 FE 17.69,AL203 16.06,MGO 12.44,CR/FE 1.73.

Reporter information

Type Date Name Affiliation Comment
Reporter 05-NOV-1984 Unknown U.S. Bureau of Mines