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Pennsylvania Mine

Prospect in Broadwater county in Montana, United States with commodities Copper, Silver, Gold
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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. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10096900
MRDS ID DC09243
Record type Site
Current site name Pennsylvania Mine

Geographic coordinates

Geographic coordinates: -111.54279, 45.98184 (WGS84)
Relative position 6 MILES NORTH OF THREE FORKS

Site location context

Political divisions (FIPS codes)

Broadwater(county)

Montana(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Three Forks(quadrangle 1:24,000 scale)

Bozeman(quadrangle 1:100,000 scale)

Bozeman(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Jefferson(hydrologic unit)

Missouri Headwaters(hydrologic accounting unit)

Missouri Headwaters(hydrologic subregion)

Missouri(hydrologic region)

Geographic areas

Country State County
United States Montana Broadwater

Public Land Survey System information

Meridian Township Range Section Fraction State
Montana Principal 003N 001E 25,26 Montana

Commodities

Commodity Importance
Copper Primary
Silver Primary
Gold Secondary

Materials information

Materials Type of material
Bornite Gangue

Alteration

  • (Local) Marmarized Limestone Locally Garnstized And Altered In Tactites

Analytical data

Result ONE REPORT INDICATED 9.3 %-CU
Result .18 OZ-AU
Result 5.8 OZ-AG
Result PER TON (1918). ONE VEIN CONTAINED 24.6 % CU.

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Stratigraphic age (youngest) Mississippian
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Mississippian
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock unit name Madison Limestone
    Rock description Madison Limestone

Nearby scientific data

(1) -111.54279, 45.98184
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Short Distance From Lombard Over Thrust

Controls for ore emplacement

  • Complex Fracture System

Comments on the geologic information

  • DIORITE SILL THOUGHT TO BE PART OF THE 10N MONZONITIC PLUTON. ; GEOL.DESC: ZONE ASSOC. WITH DIORITE SILLS IN MARMARIZED LIMESTONE, OXIDIZED CU MINERALS, CU SULFIDES SPORADICALLY CONCENTRATED ALONG COMPLEX FRACTURE SYSTEM; SAID TO RANGE 3-24% CU.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic
Significant No
Discovery year 1885

Workings at the site

  • Type of workings Surface/Underground
    Length 426.72M
    Overall depth 182.88M

Comments on the workings information

  • 600 FT SHAFT, 3 LEVELS

Reference information

Bibliographic references

  • Deposit

    REED, GC., 1951, MINES AND MINERAL DEPOSITS, BROADWATER CO, MONT, USBM, INF. CIRC. 7592, P. 53

  • Deposit

    CONSV. DIV. COMP. DATE, 06-05-1963

  • Deposit

    1951 COMPILE USBM INF. CIRC. 759

General comments

Subject category Comment text
Deposit Discovery Year: 1880'S

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1974 Unknown U.S. Geological Survey
Updater 01-MAY-1980 Doyle, Brien (Wells, John) U.S. Geological Survey

Beyond USGS

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

Maps centered on this site