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Atlantic City Iron Mine

Past Producer in Fremont county in Wyoming, United States with commodity 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. Production statistics
  16. Reserves and resources
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. Reporter information

Geologic information

Identification information

Deposit ID 10230643
MRDS ID W700604
MAS/MILS ID 0560130333
Record type Site
Current site name Atlantic City Iron Mine
Alternate or previous names South Pass Gold Mining Area, Iron Mountain, Atlantic City Mine

Geographic coordinates

Point of reference Plant
Geographic coordinates: -108.745, 42.5408 (WGS84)
Elevation 2530
Location accuracy 100(meters)

Site location context

Political divisions (FIPS codes)

Fremont(county)

Wyoming(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Miners Delight(quadrangle 1:24,000 scale)

Lander(quadrangle 1:100,000 scale)

Lander(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Sweetwater(hydrologic unit)

North Platte(hydrologic accounting unit)

North Platte(hydrologic subregion)

Missouri(hydrologic region)

Federal lands

Shoshone 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 Wyoming Fremont

Public Land Survey System information

Meridian Township Range Section Fraction State
6th Principal 030 N 100 W 34 SWNE Wyoming

Commodities

Commodity Importance
Iron Primary

Materials information

Materials Type of material
Magnetite Unknown
Chert Unknown
Goethite Unknown
Hematite Unknown

Nearby scientific data

Plant (1) -108.745, 42.5408
ListMap

Economic information

Ore body information

  • Strike N17E
    Dip 85S
    Thickness 91M
    Length 1200M
    Area 830HA
    Depth to top 0M
    Field Value
    Type of Orebody #1 SEDIMENTARY
    Shape of Orebody #1 LENTICULAR
    Type of Orebody #2 OTHER
    Shape of Orebody #2 TABULAR
    Primary mode of Origin RESIDUAL CONCENT
    Secondary mode of Origin SEDIMENTATION
    Primary Ore Control BEDDING
    Secondary Ore Control LITHOLOGY
    Strike And Dip N17E:85S
    Minimum Depth to Top 0
    Min. Thick. Unconsol. Mat. 0
    Total Surface Area (HA) 830
    Date of Last Modification 820518

Comments on the ore body information

  • Taconite is high-grade ore containing >50% Fe2O3 and with high silica content.

Economic information about the deposit and operations

Operation type Surface
Development status Past Producer
Commodity type Metallic
Significant Yes
Mining method Open Pit
Year of first production 1962
Year of last production 1982
Milling method Magnetic

Mining district

District name Atlantic City District

Mineral rights holdings

Type of mineral rights Patented
Type of mineral rights Located Claim
Type of mineral rights Fee Ownership

Land status

Ownership category National Forest

Ownership information

  • Type Owner
    Owner Universal Equipment Co.
    ID 4800145
    Interest 100
    Home office Fremont, Ohio
    Year 1992
  • Type Unknown
    Owner U.S. Steel
    Year 2010

Comments on the ownership information

  • UNIVERSAL PICKED UP THE MINE AND PERMIT IN 1985. THE COMPANY AS OF 1992, THE COMPANY IS UNDER ORDER BY THE STATE OF WYOMING TO RAIZE THE MINE AND MILL PLANT FACILITIES. (CASPER STAR- TRIBUNE, 10/23/92).
  • Wyoming State Geological Survey website states: "U.S. Steel mine at Atlantic City (taconite)". [http://www.wsgs.uwyo.edu/Topics/WYEconomics/Metals.aspx, accessed 6/9/2010]

Production statistics

  • Year 1970
    Description Iron Pellets 1471000 Metric Tons Pellets/Year
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major PELLETS Iron Iron 1471000mt
  • Year 1971
    Description Iron Pellets 1347000 Metric Tons Pellets/Year
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major PELLETS Iron Iron 1347000mt
  • Year 1972
    Description Iron Pellets 1564000 Metric Tons Pellets/Year
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major PELLETS Iron Iron 1564000mt
  • Year 1973
    Description Iron Pellets 1639000 Metric Tons Pellets/Year
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major PELLETS Iron Iron 1639000mt
  • Year 1974
    Description Iron Pellets 1693000 Metric Tons Pellets/Year
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major PELLETS Iron Iron 1693000mt
  • Year 1975
    Description Iron Pellets 1639000 Metric Tons Pellets/Year
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major PELLETS Iron Iron 1639000mt
  • Year 1976
    Description Iron Pellets 1726000 Metric Tons Pellets/Year
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major PELLETS Iron Iron 1726000mt
  • Year 1977
    Description Iron Pellets 1681000 Metric Tons Pellets/Year
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major PELLETS Iron Iron 1681000mt
  • Year 1978
    Description Iron Pellets 1551000 Metric Tons Pellets/Year
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major PELLETS Iron Iron 1551000mt
  • Year 1979
    Description Iron Pellets 1486000 Metric Tons Pellets/Year
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major PELLETS Iron Iron 1486000mt
  • Year 1980
    Description Iron Pellets 1535000 Metric Tons Pellets/Year
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major PELLETS Iron Iron 1535000mt

Comments on the production information

  • MINE PRODUCTION BEGAN IN AUGUST, 1962 WITH A PROJECTED MINE LIFE OF 30 YEARS. ATLANTIC CITY MINE OCCURS ON BOTH LOUIS LAKE AND MINERS DELIGHT 7.5. MINUTE QUADRANGLES. THE PLANT CAPACITY WAS 4161000 MTPY. PROPERTY REVIEWED BY RC SMITH, 3-87. AT THIS TIME, THE MINE HAS BEEN SHUTDOWN SINCE OCT. 1983 AND IS CONSIDERED TO BE PERMANENT. THE MINE EQUIPMENT WAS SOLD TO UNIVERSAL EQUIPMENT CO. WHO IN TURN AUCTIONED IT OFF.
  • PRODUCTION IS ONGOING. [Ceased in 1982.]

Reserves and resources

  • Type In-situ
    Estimate year 1949
    Total resources 66225600mt ore
    Commodity Subtype Grade units Group Importance Year
    Iron Fe 35.18 wt-pct Iron Major 1949

Comments on the reserve resource information

  • ATLANTIC CITY RESERVES WERE CALCULATED USING PAST PRODUCTION STATISTICS (1977-1980) AND INFORMATION ON PROJECTED MINE LIFE PROVIDED BY COMPANY OFFICIALS. RESOURCE ESTIMATE CALCULATED FROM INFORMATION IN 1984 MINERALS YEARBOOK, VOL. 2, P. 668. THE GRADE IS ASSUMED TO BE THE SAME AS PREVIOUS EVALUATION.

Workings at the site

  • Type of workings Surface
    Area 57HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ESTIMATE
    Mining Method BENCH (BERM)
    Percent Waste Rock 45.9
    Avg. Overburden Thickness 0
    Hardness of Ore HARD ROCKS
    Avg. Bench Height (meters) 11
    Max. Pit Slope (degrees) 45
    Capacity 11400
    Capacity Units MT ORE/DAY
    Unit Production Cost 2.89
    Units of Production $/MT ORE
    Operating Days per Year 365
    Operating Shifts per Day 3
    Year of Information 1981

Comments on the workings information

  • TOTAL LAND HOLDING IS 3238 HECTARES.

Comments on development

  • ORE PRODUCTION CAPACITY GREATER THAN 3,000,000 TONNES/YEAR. OPERATION SUSPENDED IN 1988. [copied from deleted record 10085076 = W700604, ref is to MINING MAGAZINE, JANUARY 1989, P. 44]

Reference information

Bibliographic references

  • Deposit

    BAYLEY, R.W. A PRELIMINARY REPORT ON THE PRECAMBRIAN IRON DEPOSITS NEAR ATLANTIC CITY, WYOMING. U. S. GEOL. SURVEY BULL. 1142-C, 1963, 23 PP.

  • Deposit

    BAYLEY, R.W., P.D. PROCTOR, AND K.C. CONDIE. GEOLOGY OF THE SOUTH PASS AREA, FREMONT COUNTY, WYOMING. U. S. GEOLOGICAL SURVEY PROF. PAPER 793, 1973, 39 PP.

  • Deposit

    BROWN, D.B. AND E.F. HARVEY. WYOMING ENERGY CONSUMPTION. A REPORT PREPARED FOR THE MINERAL DEVELOPMENT DIVISION OF THE DEPARTMENT ECONOMIC PLANNING AND DEVELOPMENT, STATE OF WYOMING. BICKERT, BROWNE, CODDINGTON AND ASSOCIATES, INC., 100 SOUTH MADISON, DENVER, COLORADO 80209. JUNE 1975, PP. 41-43.

  • Deposit

    CAMERON ENGINEERS. REVIEW AND FORECAST - WYOMING MINERAL INDUSTRIES. A REPORT PREPARED FOR THE WYOMING NATURAL RESOURCE BOARD AND THE STATE WATER PLANNING PROGRAM. 1969, PP. 160-227.

  • Deposit

    DAY, R. EXCAVATING THE WEST'S TOUGHEST TACONITE. MIN. CONG. JOUR., JUNE 1964, PP. 76-79.

  • Deposit

    ENGINEERING AND MINING JOURNAL. U. S. STEEL'S ATLANTIC CITY ORE MINE, FIRST TACONITE PRODUCER IN THE WEST. V. 166, NO. 3, MARCH 1965, PP. 73-92.

  • Deposit

    HARRER, C.M. WYOMING ORE DEPOSITS. BUMINES IC 8315, 1966, 114 PP.

  • Deposit

    KING, R.H. IRON DEPOSIT NEAR ATLANTIC CITY, WYOMING. REPORT FOR THE CHICAGO AND NORTHWESTERN RAILWAY COMPANY AND THE WYO. GEOLOGICAL SURVEY. LARAMIE, WYOMING, 1949, 10 PP.

  • Deposit

    PRIDE, D.E. AND A.F. HAGNER. GEOCHEMISTRY AND ORIGIN OF THE PRECAMBRIAN IRON FORMATION NEAR ATLANTIC CITY, FREMONT COUNTY, WYOMING. BULL. ECON. GEOL., V. 67, 1972, PP. 329-338.

  • Deposit

    RIDGE, J.D. ORE DEPOSITS OF THE UNITED STATES, 1933-1967, THE GRATON-SALES VOLUME. AMER. INST. OF MINING, METALLURGICAL, AND PETROLEUM ENGINEERS, INC., NEW YORK, 1ST ED., 1968, PP. 590-604.

  • Deposit

    SKILLINGS' MINING REVIEW. U. S. STEEL'S SHIPMENTS OF IRON ORE FROM WESTERN MINES. MARCH 14, 1981, P. 5.

  • Deposit

    1984 MINERALS YEARBOOK, VOL. 2, P. 668.

  • Deposit

    MINING MAGAZINE, JANUARY 1989, P. 44.

Reporter information

Type Date Name Affiliation Comment
Reporter 09-MAR-95 Popper, G. U.S. Bureau of Mines
Reporter 01-AUG-89 Beougher, Dee (Spanski, Gregory T.) U.S. Geological Survey
Editor 15-DEC-09 Wilson, Anna B. U.S. Geological Survey updated 6/9/2010

Beyond USGS

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

Current status (per MSHA)

StatusAbandoned since 04/26/1984
MSHA mine ID4800145
Mine name (MSHA)Atlantic City Ore Operations And Plant
Current operatorUnited States Steel Corp
Current controller (parent)USX Corp (United States Steel Corp)
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.

Operator history (post-MRDS)

MRDS records operators as of each record's last update (≤ 2019). Some of the operators listed here have since changed hands or dissolved:

  • U.S. Steel — now part of United States Steel Corporation (2024)
    Mining operations largely divested over the late 20th century; the broader U.S. Steel entity was acquired by Nippon Steel in 2024 (mining footprint is now minimal).

Curated by qvyshift.com from publicly-reported M&A activity (SEC filings, press releases, USGS Mineral Yearbooks). Not authoritative — verify against primary sources before relying on it. The MSHA panel above is the current authoritative source for actively-permitted mines.

External references

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