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Eagle Mountain Mine and Plant

Past Producer in Riverside county in California, United States with commodities Aluminum, Calcium, Iron, Magnesite, Phosphorus-Phosphates, Silica, Sulfur
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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. Reserves and resources
  16. Workings at the site
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10189008
MRDS ID W024589
MAS/MILS ID 0060650737
Record type Site
Current site name Eagle Mountain Mine and Plant
Alternate or previous names Eagle Mountain Mine
Related records 10077141

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: -115.48722, 33.89974 (WGS84)
Elevation 457
Location accuracy 10(meters)

Site location context

Political divisions (FIPS codes)

Riverside(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Pinto Wells(quadrangle 1:24,000 scale)

Eagle Mountains(quadrangle 1:100,000 scale)

Salton Sea(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Southern Mojave(hydrologic unit)

Southern Mojave(hydrologic accounting unit)

Southern Mojave-Salton Sea(hydrologic subregion)

California(hydrologic region)

Federal lands

Bureau of Land Management(Bureau of Land Management CA)

Bureau of Land Management CA BLM(Type of land area)

BLM(Federal land areas administered by BLM)

Geographic areas

Country State County
United States California Riverside

Public Land Survey System information

Meridian Township Range Section Fraction State
San Bernardino 003 S 014 E 35 California

Commodities

Commodity Importance
Aluminum Critical Tertiary
Calcium Tertiary
Iron Primary
Magnesite Tertiary
Phosphorus-Phosphates Tertiary
Silica Tertiary
Sulfur Tertiary

Materials information

Materials Type of material
Calcite Unknown
Dolomite Unknown
Gypsum Unknown
Hematite Unknown
Magnetite Unknown
Muscovite Unknown
Pyrite Unknown
Quartz Unknown
Serpentine Unknown
Talc Unknown
Tremolite Unknown

Nearby scientific data

Main Entrance (1) -115.48722, 33.89974
ListMap

Economic information

Ore body information

  • Strike N70W
    Dip 45N
    Thickness 40M
    Length 4120M
    Width 343M
    Depth to top 76M
    Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 REPLACEMENT
    Shape of Orebody #1 TABULAR
    Primary mode of Origin METAMORPHISM
    Secondary mode of Origin CONT METASOMATIC
    Primary Ore Control LITHOLOGY
    Secondary Ore Control FRACTURING
    Degree of Wallrock Alter. MODERATE
    Type of Wallrock Alter. #1 SERICITIC
    Type of Wallrock Alter. #2 CARBONATE SILIC
    Type of Wallrock Alter. #3 UNKNOWN
    Strike And Dip N70W:45N
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 18
    Min. Thick. Unconsol. Mat. 0
    Date of Last Modification 830316
  • Area 1872HA
    Field Value
    Total Surface Area (HA) 1872
    Date of Last Modification 910418

Economic information about the deposit and operations

Operation type Surface
Development status Past Producer
Commodity type Both
Deposit size Large
Significant Yes
Discovery year 1881
Year of first production 1948

Mining district

District name Eagle Mountain District

Mineral rights holdings

Type of mineral rights Patented

Land status

Ownership category BLM Administrative Area

Ownership information

  • Type Owner-Operator
    Owner Kaiser Steel Corp.
    ID 402511
    Interest 100
    Home office California
    Year 1977
  • Type Unknown
    Owner Riverside Iron And Steel Co. Owner In 1940
    ID 402511
    Home office California
    Year 1977
  • Type Unknown
    Owner Southern Pacific Co. Owner In 1908
    ID 402511
    Home office California
    Year 1978
  • Type Unknown
    Owner Iron Queen Mining Co. Owner In 1908
    ID 402511
    Home office California
    Year 1978

Reserves and resources

  • Type In-situ
    Estimate year 1978
    Measured 245000000mt ore
    Indicated 100000000mt ore
    Demonstrated 345000000mt ore
    Total resources 345000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Iron Fe 35 wt-pct Iron Major 1978

Comments on the reserve resource information

  • AVERAGE ORE GRADE EST. AS 33.4% FE.
  • MATRIX ONE IS A CUMULATIVE COMPOSIT MATRIX INDICATING ORE RESERVES, AND IS THE SUMMATION OF MATRICES TWO, THREE, AND SIX. MATRIX TWO REPRESENTS THE ESTIMATED RESERVES OF THE EAST PIT. MATRIX THREE REPRESENTS THE ESTIMATED RESERVES OUTSIDE THE EAST PIT. MATRIX SIX REPRESENTS THE PROVEN AND PROBABLE RESERVES PUBLISHED IN THE E & M J.

Workings at the site

  • Type of workings Surface
    Area 291HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ESTIMATE
    Mining Method OPEN PIT
    Swell Factor .45
    Percent Waste Rock 80.8
    Avg. Overburden Thickness 15
    Primary Material Cover SAND, GRAVEL
    Percentage 50
    Secondary Material Cover HARD ROCKS
    Percentage 25
    Tertiary Material Cover HARD ROCKS
    Percentage 25
    Hardness of Ore HARD ROCKS
    Avg. Bench Height (meters) 14
    Max. Pit Slope (degrees) 38
    Capacity 24923
    Capacity Units MT ORE/DAY
    Preprod. Stripping Vol. 33400
    Unit Production Cost 4.03
    Units of Production $/MT ORE
    Operating Days per Year 350
    Operating Shifts per Day 3
    Year of Information 1978

Reference information

Bibliographic references

  • Deposit

    ALLEN, CLARENCE R. AND DONALD V. HELMBERGER. SEARCH FOR

  • Deposit

    TEMPORAL CHANGES IN SEISMIC VELOCITIES USING LARGE

  • Deposit

    EXPLOSIONS IN SOUTHERN CALIFORNIA. IN CONFERENCE ON

  • Deposit

    TECTONIC PROBLEMS OF THE SAN ANDREAS FAULT SYSTEM, PRO-

  • Deposit

    CEEDINGS, STANFORD UNIV. PUBL., GEOL. SCI., (SSGEAS), VOL.

  • Deposit

    13, 1973, ILLUS. (INCLU. SKETCH MAPS), P. 436-445.

  • Deposit

    CALIFORNIA STATE DIVISION OF MINES. MINERAL RESOURCES AND

  • Deposit

    INDUSTRY OF CALIFORNIA. CALIF. DIV. MINES AND GEOL.,

  • Deposit

    MINER. INFORM. SERV., VOL. 1, NO. 12, 1948, PP. 1-8.

  • Deposit

    CAREY, WILLIAM W. MAGNETIC PROPERTIES OF A MASSIVE MAG-

  • Deposit

    NETIC HEMATITE DEPOSIT. AGS. AM. GEOPHYS. UNION TRANS., V.

  • Deposit

    44, NO. 4, 1963, P. 862.

  • Deposit

    DAVIS, CARL E. ELECTRIC COMPUTATION OF EAGLE MOUNTAIN ORE

  • Deposit

    RESERVES. IN COMPUTER SHORT COURSE AND SYMPOSIUM ON MATH-

  • Deposit

    EMATICAL TECHNIQUES AND COMPUTER APPLICATIONS IN MINING

  • Deposit

    AND EXPLORATION, 1962, V. 2, TUCSON, ARIZ. UNIV. ARIZONA

  • Deposit

    COLL. MINES, 1967, ILLUS., P. E2-1 -- E2-13.

  • Deposit

    RESERVES. CANADIAN MINING MANUAL, 1962, ILLUS., PP. 17,

  • Deposit

    19, 21-22.

  • Deposit

    DROSSEL, MARGARET R. KAISER'S EAGLE MOUNTAIN PROJECT - FROM

  • Deposit

    PIT TO PREMIUM PELLET. ENG. AND MIN. JOUR. VOL. 168, NO.

  • Deposit

    6, 1967, PP. 101-122.

  • Deposit

    DUBOIS, ROBERT L. AND RICHARD W. BRUMMETT. GEOLOGY OF THE

  • Deposit

    EAGLE MOUNTAIN MINE AREA. IN ORE DEPOSITS OF THE UNITED

  • Deposit

    STATES, 1933-1967 (GRATON-SALES VOLUME), V. 2, NEW YORK,

  • Deposit

    AM. INST. MINING METALLURGICAL AND PETROLEUM ENGINEERS,

  • Deposit

    1968, ILLUS., TABLE, PP. 1592-1606.

  • Deposit

    ENGINEERING AND MINING JOURNAL. EAGLE MOUNTAIN MOVES

  • Deposit

    170,000 TPD OF ORE AND WASTE. ENG. AND MIN. JOUR., VOL.

  • Deposit

    175, NO. 11, 1974, PP. 153-154.

  • Deposit

    ENGINEERING AND MINING JOURNAL. INTERNATIONAL DIRECTORY OF

  • Deposit

    MINING AND MINERAL PROCESSING OPERATIONS PUB. BY ENG.

  • Deposit

    AND MIN. JOUR., 1977, PP. 171-172.

  • Deposit

    HADLEY, JARVIS B. IRON ORE DEPOSITS IN THE EASTERN PART OF

  • Deposit

    THE EAGLE MOUNTAINS RIVERSIDE COUNTY, CALIFORNIA. IN IRON

  • Deposit

    RESOURCES OF CALIFORNIA. CALIF. DIV. OF MINES AND GEOL.

  • Deposit

    BULL. 129, 1945, 16 PP.

  • Deposit

    HADLEY, JARVIS B. IRON DEPOSITS IN PART OF THE EAGLE MOUNT-

  • Deposit

    AINS RIVERSIDE COUNTY, CALIFORNIA. U. S. GEOL. SURV. OPEN

  • Deposit

    FILE REPORT, AUG. 1942, 33 PP.

  • Deposit

    HARDER, EDMUND C. IRON-ORE DEPOSITS OF THE EAGLE MOUNTAINS,

  • Deposit

    CALIFORNIA. U. S. GEOL. SURV. BULL. 503, 1912, 81 PP.

  • Deposit

    HOPE, ROGER. GEOLOGY AND STRUCTURAL SETTING OF THE EASTERN

  • Deposit

    TRANSVERSE RANGES, SOUTHERN CALIF. U.C.L.A. P.H.D.

  • Deposit

    THESIS ALSO IN U.S.G.S. PP. 650-D, 1968, INCLUDES GEOLOGIC

  • Deposit

    MAP, 116 PP.

  • Deposit

    HUSEMAN, G.W. KAISER STEPPING UP PRODUCTION AT EAGLE MOUNT-

  • Deposit

    AIN IRON MINE. ENG. AND MIN. JOUR., VOL. 154, NO. 5,

  • Deposit

    1953 PP. 80-86.

  • Deposit

    KAISER INDUSTRIES CORPORATION NOTICE OF SPECIAL MEETING OF

  • Deposit

    STOCKHOLDERS, APRIL 20, 1977, PP. 41-42.

  • Deposit

    MCMILLAN, W.D. AND GEORGE H. HOLMES, JR. INVESTIGATIONS OF

  • Deposit

    THE EAGLE MOUNTAINS IRON DISTRICT RIVERSIDE COUNTY, CALIF.

  • Deposit

    BUMINES PRELIMINARY R.I., CIRCA 1941, 20 PP.

  • Deposit

    MINING ENGINEERING EAGLE MOUNTAIN SHIPS 100 MILLION TONS OF

  • Deposit

    ORE. MINING ENG. V. 29, NO. 10, OCT. 1977, 13 PP.

  • Deposit

    MINERALS PROCESSING. IRON ORE PELLETIZING AT EAGLE MOUNTAIN.

  • Deposit

    MINERAL PROCESSING FEBRUARY 1968, PP. 8-30.

  • Deposit

    NOVAK, G. A. PETROGRAPHY AND MINERALOGY OF A 'RAPAKIVI'

  • Deposit

    QUARTZ MONZONITE PLUTON, EAGLE MOUNTAIN QUADRANGLE,

  • Deposit

    CALIFORNIA, 1967, MASTER'S PENN. STATE.

  • Deposit

    OLSON, EMMETT K. TRUCK SERVICING AND MAINTENANCE PROGRAM AT

  • Deposit

    KAISER'S EAGLE MOUNTAIN MINE. MINING CONGRESS JOUR. VOL.

  • Deposit

    60, NO. 3, MARCH 1974, PP. 22-26.

  • Deposit

    PELKA, GARY J. GEOLOGY OF THE MCCOY AND PALEN MTNS. SOUTH

  • Deposit

    EASTERN, CALIF., 1973, U. OF C. @ SANTA BARBARA P.H.D.

  • Deposit

    THESIS.

  • Deposit

    POWELL, KENNETH B. EAGLE MOUNTAIN HELPS KAISER MEET GROWING

  • Deposit

    WESTERN STEEL NEEDS. A.I.M.E. MIN. ENG., MAY 1953, PP.

  • Deposit

    479-483.

  • Deposit

    POWELL, R.E. AND L. T. SILVER. CRYSTALLINE ROCKS OF A

  • Deposit

    PORTION OF THE EASTERN TRANSVERSE RANGES, RIVERSIDE COUNTY

  • Deposit

    CALIFORNIA. ABSTR. GEOL. SOC. AM. ABSR. PROGRAMS. VOL.

  • Deposit

    10, NO. 3, 1978, P. 142.

  • Deposit

    SISSELMAN, ROBERT. CHILE'S FIRST PELLET PLANT INCORPORATES

  • Deposit

    HEAT RECOUP SYSTEM AND SELF-FLUXING PELLETS. ENG. AND MIN

  • Deposit

    JOUR. VOL. 179, NO. 5, 1978, PP. 90-93.

  • Deposit

    SKILLINGS, DAVID N., JR. KAISER STEEL CORP.'S EAGLE MOUNT-

  • Deposit

    AIN IRON ORE MINE. SKILLINGS MINING REVIEW. JAN. 15, 1972

  • Deposit

    PP. 14-19.

  • Deposit

    SKILLINGS MINING REVIEW. 1977 IRON ORE SHIPMENTS OF

  • Deposit

    COMPANIES. SKILLINGS MINING REVIEW, JULY 1978, PP. 8-9.

  • Deposit

    STRAAM ENGINEERS, INC. CAPITAL AND OPERATING COST ESTIMAT-

  • Deposit

    ING SYSTEM HANDBOOK, BUMINES CONTRACT NO. J0255026.

  • Deposit

    STAFF. EAGLE MOUNTAINS IRON DISTRICT RIVERSIDE COUNTY,

  • Deposit

    CALIF. BUMINES WAR MINERALS REPORT. 97, 1943, 44 PP.

  • Deposit

    TRENGOVE, R. R. METHODS AND OPERATIONS AT THE KAISER STEEL

  • Deposit

    CORP. EAGLE MOUNTAIN IRON MINE RIVERSIDE COUNTY, CALIF.

  • Deposit

    BUMINES IC. 7735, 1956, 25 PP.

  • Deposit

    VER PLANCK, WILLIAM E. QUARTZITE IN CALIFORNIA. CALIF. DIV.

  • Deposit

    OF MINES AND GEOL. BULL. 187, 1966, P. 31 & 51.

  • Deposit

    WICK, DAVID E. AND EDWARD M. SUNMOO. COMPUTER USE IN

  • Deposit

    DETERMINING ORE RESERVES AND STRIPPING RATIOS AT EAGLE

  • Deposit

    MOUNTAIN. INT. SYMP. APPL. COMPUT. MATH. MINER. IND.,

  • Deposit

    PROC., NO. 12, VOL. II, 1974, PP. H59-H71.

General comments

Subject category Comment text
Deposit THE ESTIMATED ORE GRADE IS 33.4% IRON (FE), 19 % SILICA (SI02), 8 % MAGNESIA (MGO), 4 % LIME (CAO), 4 % ALUMINA (AL203), .07 % PHOSPHOROUS (P), AND .7 % SULFUR (S). A ROAD WAS CONSTRUCTED 19 KILOMETERS (KM) FROM INTER- STATE HIGHWAY TEN FOR MINE DEVELOPMENT. WATER IS OBTAINED FROM WELLS. THE FIRST WELL DRILLED, WAS 14 KM NORTHEAST OF THE MINE AT PINTO WELLS. ELECTRICAL POWER WAS BROUGHT IN FROM THE SOUTH, A DISTANCE OF EIGHT KM FROM THE METROPOLITAN WATER DISTRICT EAGLE MOUNTAIN PUMPING PLANT. AN 84 KM STANDARD-GUAGE RAILROAD LINE WAS BUILT DURING 1947-1948, BETWEEN THE MINE AND FERRUM, CALIFORNIA, A STATION ON THE SOUTHERN PACIFIC RAILROAD, FIVE KM SOUTHEAST OF SALTON STATION. THE METASEDIMENTS ARE PROBABLY PALEOZOIC, AND POSSIBLY PRECAMBRIAN. THE ORE MINERALS ARE PROBABLY CRETACEOUS AND CERTAINLY MESOZOIC.

Reporter information

Type Date Name Affiliation Comment
Reporter 08-MAR-95 Lindsey, David S. U.S. Bureau of Mines

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Current status (per MSHA)

StatusActive since 01/15/2025
MSHA mine ID0402511
Mine name (MSHA)Eagle Mountain Mine
Current operatorAggregate & Mineral Resource Group LLC
Current controller (parent)Gary Sweetwood; Aaron Richard Siroonian
Mine typeSurface (Metal / non-metal)

MSHA cross-reference per the original MRDS record. Mine status and operator reflect MSHA's last published Mines export (February 2025); MSHA's public bulk feed has been unavailable since, so this may be out of date. See the Mine Data Retrieval System for current status.

Open MSHA's Mine Data Retrieval System for inspections, accidents, and violations for this mine.

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.