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Hoffman Iron Deposit Mine

Past Producer in Lawrence county in South Dakota, United States with commodities Iron, Manganese
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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. Controls for ore emplacement
  11. Economic information about the deposit and operations
  12. Mining district
  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 10055515
MRDS ID SD02077
Record type Site
Current site name Hoffman Iron Deposit Mine

Geographic coordinates

Geographic coordinates: -103.6964, 44.30913 (WGS84)
Elevation 1743
Relative position 4.5 MILES SOUTHEAST OF LEAD, SOUTH DAKOTA

Site location context

Political divisions (FIPS codes)

Lawrence(county)

South Dakota(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Deadwood South(quadrangle 1:24,000 scale)

Rapid City(quadrangle 1:100,000 scale)

Rapid City(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Belle Fourche(hydrologic unit)

Belle Fourche(hydrologic accounting unit)

Cheyenne(hydrologic subregion)

Missouri(hydrologic region)

Federal lands

Black Hills 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 South Dakota Lawrence

Public Land Survey System information

Meridian Township Range Section Fraction State
Black Hills 004N;004N 003E;004E 13;18 South Dakota

Commodities

Commodity Importance
Iron Primary
Manganese Critical Secondary

Materials information

Materials Type of material
Hematite Ore
Iron Ore

Analytical data

Result HAND SAMPLES RUN 35 - 52 % MN

Nearby scientific data

(1) -103.6964, 44.30913
ListMap

Economic information

Ore body information

  • General form HORIZONTAL
    Thickness 3.35M

Controls for ore emplacement

  • Basal Conglomerate Of Deadwood Formation

Comments on the geologic information

  • THE MANGANESE IS IN CLOSELY SPACED FRACTURES IN THE LOWER PART OF THE DEADWOOD SANDSTONE AND QUARTZITE

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1948

Mining district

District name Lead District

Land status

Ownership category National Forest
Area name Black Hills National Forest

Ownership information

  • Type Operator
    Owner Strawberry Hill Mining Co.
  • Type Owner
    Owner J. L. Hoffman And Associates

Workings at the site

  • Type of workings Surface
    Overall length 91.44M
    Overall width 9.14M

Comments on development

  • MINING BEGUN ON SUNSET NO. 5 CLAIM IN SEC. 18 . NO MINING OF MANGANESE VEINS: 310 AC.

Reference information

Bibliographic references

  • Deposit

    US BUREAU OF MINES, 1954 , BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART I, BUREAU OF MINES INFORMATION CIRCULAR 7688

  • Production

    US BUREAU OF MINES, 1954 , BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART I, BUREAU OF MINES INFORMATION CIRCULAR 7688 .

General comments

Subject category Comment text
Deposit DRILL HOLES UP TO 200 FEET BEYOND FACE SHOW ORE CONTINUES UNDER CONSIDERABLE OVERBURDEN WHICH CONSISTS OF SANDSTONE, QUARTZITE AND SHALE, THICKNESS RANGES FROM 2 - 11 FT.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-1979 Barari, Rachel A. U.S. Geological Survey

Beyond USGS

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

External references

Maps centered on this site