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Iowa Hill Chrome Mine

Past Producer in Placer county in California, United States with commodities Chromium, Iron
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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. Mineral rights holdings
  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 10188665
MAS/MILS ID 0060610651
Record type Site
Current site name Iowa Hill Chrome Mine
Alternate or previous names Williamson and Beck Property

Geographic coordinates

Point of reference Trench
Geographic coordinates: -120.78713, 39.12409 (WGS84)
Elevation 1053
Location accuracy 10(meters)

Site location context

Political divisions (FIPS codes)

Placer(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Foresthill(quadrangle 1:24,000 scale)

Truckee(quadrangle 1:100,000 scale)

Chico(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

North Fork American(hydrologic unit)

Lower Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Federal lands

Tahoe 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 Placer

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 015 N 011 E 19 SWSWSW California

Commodities

Commodity Importance
Chromium Critical Tertiary
Iron Tertiary

Materials information

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

Nearby scientific data

Trench (1) -120.78713, 39.12409
ListMap

Economic information

Ore body information

  • Strike N30W
    Dip 90N
    Thickness 10M
    Length 600M
    Width 50M
    Area 1HA
    Depth to top 0M
    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
    Degree of Wallrock Alter. INTENSE
    Type of Wallrock Alter. #1 CARBONITIZATION
    Strike And Dip N30W:90N
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 0
    Min. Thick. Unconsol. Mat. 0
    Total Surface Area (HA) 1
    Date of Last Modification 780615

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 1917

Mining district

District name Damascus

Mineral rights holdings

Type of mineral rights Other

Land status

Ownership category National Forest

Ownership information

  • Type Owner
    Owner U.S. Forest Service - Tahoe National Forest
    Interest 100
    Home office California
    Year 1976
  • Type Owner-Operator
    Owner Ws And W Hales And Ws Macy (Last Operator)
    Home office California
    Year 1976
    Last 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 20M
    Overall depth 20M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Mining Method OPEN STOPE
    Swell Factor .6
    Hardness of Rock HARDROCK FISSURED WITH 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 1
    1st Condition of Workings CAVED AT PORTAL

Reference information

Bibliographic references

  • Deposit

    RYNEARSON,GA, CAL DIV MINES & GEOL. BULL 134,PT3,CHAP5,P216-

  • Deposit

    BRADLET ET AL, 1918.MN & CR IN CAL,CAL ST MINING BUR BULL 76

  • Deposit

    WARING,CA 1917 UNPUB CAL ST MINING BUK FIELD REPT,PLACER CO

General comments

Subject category Comment text
Deposit LOCATION DONE ON IOWA HILL NO.2&3PIT. NO INFORMATION ON ORE ESTIMATES USED IN REPORT ARE FROMORE IN NEARBY ESTHER & PHYL E-46 PERCENT CR2O3, CR/FE=2.8. 326 TONS SHIPPED THRU WW1. VISTED 2 DEC 1975 BY CDMG. NO RESERVE ESTIMATE,BUT ARE PROB ALL. INSUFFICIENT DATA FOR MATRIX CALCULATIONS. THE AVERAGE LE GRADE OF CHROMITE IS 46 PERCENT, AND IRON IS 11 PERCENT ANALYSIS BY CDMG IN 1976 GAVE FOLLOWING PERCENTAGES-NO.1 MIN VE ORE=S102 3.12,CR2O3 56.69,FEO 9.66,TOTAL FE 12.87,AL203 1 O 15.34,CR/FE 3.88.NO.2&3 MINE,MASSIVE ORE=S102 5.35,CR2O3 5 O 14.33,TOTAL FE 14.47,AL203 10.39,MGO 17.41,CR/FE 3.11.

Reporter information

Type Date Name Affiliation Comment
Reporter 05-NOV-1984 Unknown 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.