Iowa Hill Chrome Mine

Past Producer in Placer county in California, United States with commodity Chromium

Geologic information

Identification information

Deposit ID 10098563
MRDS ID M100351
Record type Site
Current site name Iowa Hill Chrome Mine
Alternate or previous names Williamson and Beck Property 1918

Geographic coordinates

Geographic coordinates: -120.7877, 39.12406 (WGS84)
Elevation 1053
(click for info)

Geographic areas

Country State County
United States California Placer

Public Land Survey System information

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

Comments on the location information

  • PIT USED AS THE LOCATION POINT IS IN THE AREA CALLED IOWA HILL #2, 3 ON RYNEARSON'S MAP (1953). PIT IS 800 FT NE OF COMMON CORNER OF SECTS 19, 24, 25, 30 JUST ABOVE A SMALL CREEK.

Commodities

Commodity Importance
Chromium Primary

Comments on the commodity information

  • ABOVE VALUES FROM CHROMITE OF NEAR BY ESTNER AND PHYLLIS MINE. IOWA HILL CR VALUES ASSUMED TO BE THE SAME.

Materials information

Materials Type of material
Chromite Ore

Analytical data

Result AVG. 46% CR2O3
Result CR TO FE RATIO 2.8 TO 1

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Serpentinite

Nearby scientific data

(1) -120.7877, 39.12406

Ore body information

  • General form POD
    Thickness 10M
    Width 50M
    Length 600M

Comments on the geologic information

  • DEPOSIT OCCURS IN THE NORTHERN HALF OF A NNW TRENDING PERIDOTITE BODY THAT IS EXPOSED OVER AN AREA APPROX. 2 MILES BY 5 MILES AND IS BORDERED BY PALEO ZOIC META SEDS. AND TERTIARY VOLCANICS.

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of last production 1917

Mining district

District name Forest Hill Diride Area

Land status

Ownership category National Forest

Ownership information

  • Type Operator
    Owner Macy, Wm. And W. S. Hales
    First year 1918
  • Type Owner
    Owner W. S. Macy, Wm. And W. S. Hales
    First year 1918

Production statistics

  • Year 1918
    Period 1917-1918
    Material ORE CR
    Accuracy Accurate
    Description Cp_Grade: ^Avg. 46% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Ore Chromium Chromium 46wt-pct

Workings at the site

  • Type of workings Surface
    Overall depth 4M
    Overall length 68.58M
    Overall width 10M

Comments on the workings information

  • WORKINGS CONSISTED (1975) OF PITS AND TRENCHES; THE LARGEST TRENCH HAD ABOVE DIMENSIONS.

Comments on development

  • DURING W.W. II, VICTORY CHROME CO.'S PROSPECTING REVEALED NO NEW CHROMITE ORE BODIES.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS M100351

Bibliographic references

  • Deposit

    RYNEARSON, G.A., 1953, CDMG BULL 134, PT. 3, CHAPT. 5, P. 216, 217.

  • Deposit

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

  • Deposit

    BRADLEY, W.W. ET AL, 1958, CALIF. STATE MINING BUREAU BULL 76, P. 164

  • Production

    CDMG MINERAL PROPORTY REPORT, 1975, UNPUBLISHED

General comments

Subject category Comment text
Deposit DEPOSIT CONSISTS OF A SERIES OF SMALL PODS THAT HARE ABOVE STRIKE FOR APPROX. 600 M. ORE ZONE DIMENSIONS ESTIMATED TO BE AS SHOWN ABOVE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JAN-1983 Oster, Karel L. (Albers, John P.) U.S. Geological Survey