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Union Pacific Shaft

Occurrence in Jefferson county in Colorado, United States with commodities Uranium, Copper, Zinc, Bismuth, Lead, Silver
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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. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Land status
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10087813
MRDS ID D010151
Record type Site
Current site name Union Pacific Shaft
Alternate or previous names Union Pacific Prospect
Related records 10166451

Geographic coordinates

Geographic coordinates: -105.26641, 39.77027 (WGS84)
Elevation 2027
Relative position 2.4 MILES N 66 W FROM GOLDEN

Site location context

Political divisions (FIPS codes)

Jefferson(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ralston Buttes(quadrangle 1:24,000 scale)

Denver West(quadrangle 1:100,000 scale)

Denver(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Clear(hydrologic unit)

South Platte(hydrologic accounting unit)

South Platte(hydrologic subregion)

Missouri(hydrologic region)

Geographic areas

Country State County
United States Colorado Jefferson

Public Land Survey System information

Meridian Township Range Section Fraction State
6th Principal 003S 070W 19 SW OF SE Colorado

Comments on the location information

  • ALONG GOLDEN GATE CANYON ; INFO FROM LAND.ST :(1975)

Commodities

Commodity Importance
Uranium Primary
Copper Primary
Zinc Critical Secondary
Bismuth Critical Tertiary
Lead Tertiary
Silver Tertiary

Materials information

Materials Type of material
Bornite Ore
Chalcocite Ore
Chalcopyrite Ore
Pitchblende Ore
Sphalerite Ore
Tennantite Ore
Ankerite Gangue
Calcite Gangue
Chlorite Gangue
Hematite Gangue

Alteration

  • (Local) Replacement Of Fragments In The Breccia By K-Feldspar Or Ankerite

Analytical data

Result CHANNEL SAMPLES FROM UNDERGROUND WORKINGS CONTAINED 0.003 TO 0.810% U WITH ANOMALOUS HIGH VALUE OF 5.84% U, WITH 0.10 TO 0.49% CU, 0 TO 0.04% PB, 0.08 TO 0.95% ZN, TRACE AU, TRACE TO 0.72 OZ/TON AG, 3.3 TO 8.8% CACO3, TRACE AMTS. OF NI AND CO.

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Pegmatite
    Rock unit name Granitic Pegmatite
    Rock description Granitic Pegmatite
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss
    Rock unit name Idaho Springs Formation-Hornblende Gneiss Unit
    Rock description Idaho Springs Formation-Hornblende Gneiss Unit

Economic information

Geologic structures

Type of structure Regional
Structure description Front Range Uplift, Denver Basin
Type of structure Local
Structure description Hurricane Hill Fault System

Ore body information

  • Thickness 4.57M

Controls for ore emplacement

  • Ne-Trending Breccia Reef-Related Fracture In Favorable Hornblende Gneiss

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Ralston Buttes District

Land status

Ownership category Private

Comments on the workings information

  • SURFACE CUT AND 57-FT-DEEP INCLINED SHAFT ON HEADING OF N65E WITH SHORT DRIFTS AT 30-FT LEVEL

Comments on development

  • ORIGINALLY A COPPER PROSPECT, DEWATERED IN 1951 BY UP RAILROAD FOR SAMPLING BY USGS

Reference information

General comments

Subject category Comment text
Deposit LARAMIDE RIGHT-LATERAL HOST FAULT RELATED TO HURRICANE HILL FAULT SYSTEM TRENDS N 15 TO 20 W AND DIPS 35 NE. PITCHBLENDE AND ASSOCIATED SPARSE SULFIDES OCCUR IN THIN ZONE ON HIGHLY ALTERED HANGING WALL OF CENTRAL BRECCIA. ADAMS AND STUGARD'S (1956) PARAGENESIS: 1) PROPYLITIZATION AND CHLORITIZATION OF HORNBLENDE FROM GNEISS, WITH SOME PYRITE; 2) POTASSIC ALTERATION AND CRYSTALLIZATION OF ORTHOCLASE (REPLACEMENT OF PLAGIOCLASE); 3) PITCHBLENDE DEPOSITION WITH HEMATITE; 4) SIMPLE CU AND BASE-METAL SULFIDE DEPOSITION FOLLOWED BY TENNANTITE REPLACEMENT AND CHALCOPYRITE; 5) VIGOROUS CALCITE AND ANKERITE FORMATION WITH MINOR PYRITE. FAVORABILITY OF GNEISS APPARENTLY DUE TO HIGH FE-CONTENT (HORNBLENDE) MINERALS THAT ARE READILY ATTACKED BY SOLUTIONS, SUBSEQUENTLY PRECIPITATING FE TO PROVIDE EFFECTIVE MECHANISM FOR U DEPOSITION.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JAN-1983 Banke, Carl M. Colorado Geological Survey
Updater 01-MAY-1993 Spanski, Gregory T. 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

Authoritative Colorado resources

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