The Union Pacific Shaft is a uranium and copper mine located in Jefferson county, Colorado at an elevation of 6,650 feet.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
Elevation: 6,650 Feet (2,027 Meters)
Commodity: Uranium, Copper
Lat, Long: 39.77028, -105.26583
Map: View on Google Maps
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Union Pacific Shaft MRDS details
Site Name
Primary: Union Pacific Shaft
Secondary: Union Pacific Prospect
Commodity
Primary: Uranium
Primary: Copper
Secondary: Zinc
Tertiary: Silver
Tertiary: Bismuth
Tertiary: Lead
Location
State: Colorado
County: Jefferson
District: Ralston Buttes District
Land Status
Land ownership: Private
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
Deposit Type: Vein
Operation Type: Unknown
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Rocky Mountain System
Physiographic Province: Southern Rocky Mountains
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Type: R
Description: Front Range Uplift, Denver Basin
Type: L
Description: Hurricane Hill Fault System
Alterations
Alteration Type: L
Alteration Text: Replacement Of Fragments In The Breccia By K-Feldspar Or Ankerite
Rocks
Name: Pegmatite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Neoproterozoic
Name: Pegmatite
Role: Associated
Age Type: Host Rock
Age Young: Neoproterozoic
Name: Pegmatite
Role: Associated
Age Type: Associated Rock
Age Young: Neoproterozoic
Name: Pegmatite
Role: Associated
Age Type: Host Rock Unit
Age Young: Neoproterozoic
Analytical Data
Analytical Data: 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.
Materials
Ore: Pitchblende
Ore: Tennantite
Ore: Bornite
Ore: Sphalerite
Ore: Chalcocite
Ore: Chalcopyrite
Gangue: Chlorite
Gangue: Calcite
Gangue: Hematite
Gangue: Ankerite
Comments
Comment (Development): ORIGINALLY A COPPER PROSPECT, DEWATERED IN 1951 BY UP RAILROAD FOR SAMPLING BY USGS
Comment (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.
Comment (Location): ALONG GOLDEN GATE CANYON ; INFO FROM LAND.ST :(1975)
Comment (Workings): SURFACE CUT AND 57-FT-DEEP INCLINED SHAFT ON HEADING OF N65E WITH SHORT DRIFTS AT 30-FT LEVEL
References
Reference (Deposit): NELSON-MOORE, J.L., COLLINS, D.B., AND HORNBAKER, A.L., 1978, RADIOACTIVE MINERAL OCCURRENCES OF COLORADO AND BIBLIOGRAPHY: COLORADO GEOLOGICAL SURVEY BULL. 40, P. 195
Reference (Deposit): SHERIDAN, DOUGLAS M. AND OTHERS, 1967, GEOLOGY AND URANIUM DEPOSITS OF THE RALSTON BUTTES DISTRICT, JEFFERSON COUNTY, COLORADO: USGS PROF. PAPER 520.
Reference (Deposit): ADAMS, J.W., AND STUGARD, FREDERICK, JR., 1956, WALL-ROCK CONTROL OF CERTAIN PITCHBLENDE DEPOSITS IN GOLDEN GATE CANYON, JEFFERSON COUNTY, COLORADO: USGS BULL. 1030-G.
Reference (Deposit): ADAMS, J.W., AND OTHERS, 1953, URANIUM OCCURRENCES IN THE GOLDEN GATE CANYON AND RALSTON CREEK AREAS, JEFFERSON COUNTY, COLORADO: USGS CIRC. 320
Colorado Mining Photos
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