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Pennsylvania Mine

Past Producer in Summit county in Colorado, United States with commodities Gold, Silver, Lead, Copper, Zinc
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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. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  13. Economic information about the deposit and operations
  14. Mining district
  15. Production statistics
  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 10108421
MRDS ID DC05609
MAS/MILS ID 81170136
Record type Site
Current site name Pennsylvania Mine
Alternate or previous names Penn Mine

Geographic coordinates

Point of reference Geographic coordinates: Elevation UTM Precision Relative position Point location
-105.80889, 39.6 (WGS84) 250
(click for info)
-105.80972, 39.60083 (WGS84) 250

Site location context

Political divisions (FIPS codes)

Summit(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Montezuma(quadrangle 1:24,000 scale)

Denver West(quadrangle 1:100,000 scale)

Denver(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Blue(hydrologic unit)

Colorado Headwaters(hydrologic accounting unit)

Colorado Headwaters(hydrologic subregion)

Upper Colorado(hydrologic region)

Federal lands

White River 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 Colorado Summit

Public Land Survey System information

Meridian Township Range Section Fraction State
6th Principal 05S 75W 20 Colorado

Comments on the location information

  • NW slope of Decatur Mountain and south side of Peru Creek, about 3 miles ENE of Montezuma, in SE/4 sec.20, T 5 S, R 75 W. Other (previous) mines listed above, Congress, Rothschild (Minerou) Tunnel, are separate mines on the north side of Peru Creek.

Commodities

Commodity Importance
Gold Primary
Silver Primary
Lead Primary
Copper Primary
Zinc Critical Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Sphalerite Ore
Tetrahedrite Ore
Pyrite Gangue
Quartz Gangue

Alteration

  • (Local) wall rocks are silicified, pyritized

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Schist
    Rock unit name Idaho Springs Formation
    Stratigraphic age (youngest) Paleoproterozoic
  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss
    Rock unit name Idaho Springs Formation
    Stratigraphic age (youngest) Paleoproterozoic
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid
    Rock unit name Silver Plume Granite
    Stratigraphic age (youngest) Mesoproterozoic
  • Host or associated Host
    Rock type Plutonic Rock > Porphyry
    Rock unit name Montezuma quartz monzonite stock
    Stratigraphic age (youngest) Tertiary

Nearby scientific data

(1) -105.80889, 39.6
ListMap
(2) -105.80972, 39.60083
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description ore localized in competent gneiss wall rock

Comments on the geologic information

  • The Pennsylvania vein strikes NE and dips steeply NW to SE.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Significant No

Mining district

District name Montezuma District
District name Montezuma - Geneva Creek

Production statistics

  • Year 1923
    Period 1888-92, 1922-23
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Copper Copper 39mt
    Major Silver Silver 122858.74g
    Major Gold Gold 93.31g
    Major Lead Lead 21692.6mt

Comments on the production information

  • Estimated production (1885-1930) totaled about 2860 oz. of gold, 760,000 oz. silver, 6,600,000 lb. lead, plus lesser amounts of copper and zinc.
  • Do not trust the numbers in the second production record from MAS 0081170136. They don't make any sense. contained metal can't be greater than total tons of ore. Only citation for this record was PP-178, p. 92. There are no specific production values on this page. Production is cataloged on p. 95, where total short tons came to only 39,119.6 short tons. A far cry from 66,454 mt.

Workings at the site

  • Type of workings Underground

Comments on the environmental information

  • "Penn" Mine is leaking approx. 186 pounds Cd, 4,496 pounds Cu, 21,529 pounds Mn, 21 pounds Pb, and 39,896 pounds Zn per year into Peru Creek. (DenverPost, 9-9-2012)

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit SANDSTONE USED IN SILVERTON CITY HALL

Reporter information

Type Date Name Affiliation Comment
Reporter 1973-03-01 Conservation Division Files U.S. Geological Survey
Updater 1991-04-01 Wilson, Anna B. U.S. Geological Survey revised 22-oct-2012. merged and deleted duplicate record.
Updater 2006-01-17 Beach, Richard A. Colorado Geological Survey
Editor 2007-08-07 Melton, Greg U.S. Geological Survey
Reporter 1983-11-17 Intermountain Field Operations Center (IFOC) U.S. Bureau of Mines MAS 0081170136

Beyond USGS

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

External references

Maps centered on this site

Authoritative Colorado resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.