Orphan Girl

Prospect in Silver Bow county in Montana, United States with commodity Manganese
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 10197819
MAS/MILS ID 0300930033
Record type Site
Current site name Orphan Girl
Alternate or previous names Orphan Boy, Anglo Saxon, Kit Carson

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: -112.56589, 46.0102 (WGS84)
Elevation 1737
Location accuracy 10(meters)

Site location context

Political divisions (FIPS codes)

Silver Bow(county)

Montana(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Butte North(quadrangle 1:24,000 scale)

Butte North(quadrangle 1:100,000 scale)

Butte(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Clark Fork(hydrologic unit)

Pend Oreille(hydrologic accounting unit)

Kootenai-Pend Oreille-Spokane(hydrologic subregion)

Pacific Northwest(hydrologic region)

Geographic areas

Country State County
United States Montana Silver Bow

Public Land Survey System information

Meridian Township Range Section Fraction State
Montana Principal 003 N 008 W 14 NENWSW Montana

Commodities

Commodity Importance
Manganese Critical Tertiary

Materials information

Materials Type of material
Rhodochrosite Unknown
Wad Unknown

Nearby scientific data

Main Entrance (1) -112.56589, 46.0102

Economic information

Ore body information

  • Strike N60E
    Dip 60S
    Thickness 3M
    Length 457M
    Width 305M
    Depth to top 0M
    Field Value
    MAS Matrix # 1
    Type of Orebody #1 FISSURE VEIN
    Shape of Orebody #1 TABULAR
    Primary mode of Origin HYDROTHERMAL
    Primary Ore Control FAULTING
    Degree of Wallrock Alter. UNKNOWN
    Type of Wallrock Alter. #1 UNKNOWN
    Strike And Dip N60E:60S
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 3
    Min. Thick. Unconsol. Mat. 0
    Date of Last Modification 830316
  • Area 5.57HA
    Field Value
    Total Surface Area (HA) 5.57
    Date of Last Modification 910418

Economic information about the deposit and operations

Operation type Underground
Development status Prospect
Commodity type Metallic
Significant No
Year of first production 1917

Mining district

District name Butte District

Mineral rights holdings

Type of mineral rights Patented

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner Anaconda Co.
    Interest 100
    Home office New York
    Year 1976

Workings at the site

  • Type of workings Underground
    Overall depth 120M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method PROPOSED
    Mining Method HORIZ CUT & FILL W/WASTE ROCK 10-60
    Hardness of Rock HARDROCK FISSURED WITH MODERATE WATER
    Rock Characteristics MULTIPLE SYSTEMS OF WEAKNESS PLANES
    Rock Support Chars. SUPPORTING MAY BACK SLAB
    Mine Support Chars. POST, HEADBOARD, CAPS, ROOF BOLTS
    Number of Shafts 1
    1st Condition of Workings CAVED AT PORTAL
    Capacity 363
    Capacity Units MT ORE/DAY
    Unit Production Cost 23.38
    Units of Production $/MT ORE
    Operating Days per Year 250
    Operating Shifts per Day 2
    Year of Information 1976

Reference information

Bibliographic references

  • Deposit

    ANON NO DATE ORPHAN GIRL UNPUB USBM MANUSCRIPT

General comments

Subject category Comment text
Deposit THE ORPHAN GIRL IS ONE OF 39 BUTTE MN DEPOSITS. A COMPLETE EVALUATION OF THE BUTTE MN DISTRICT IS AVAILABLE UNDER SEQ. NO. 0300930244. THE TONNAGE AVAILABLE AT THE ORPHA GIRL IS NOT USED IN THE PROPOSED DEVELOPMENT OF THE BUTTE MN DISTRICT BECAUSE OF INSUFFICIENT ASSAY DATA ON PRIMARY COPRODUCTS (ZN,PB,AG). FURTHER INVESTIGATION IS ADVISED.

Reporter information

Type Date Name Affiliation Comment
Reporter 27-FEB-84 Wetzel, Nicholas U.S. Bureau of Mines

Beyond USGS

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

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:

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.