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Ascension Mine

Producer in Jefferson county in Colorado, United States with commodities Uranium, Copper, Lead
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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. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  11. Ore body information
  12. Economic information about the deposit and operations
  13. Mining district
  14. Land status
  15. Ownership information
  16. Production statistics
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10107989
MRDS ID D010153
Record type Site
Current site name Ascension Mine
Alternate or previous names Nair Prospect, Nare Lease
Related records 10288203

Geographic coordinates

Geographic coordinates: -105.29086, 39.77971 (WGS84)
Elevation 2120
Relative position 3.8 MILES N 68 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 071W 24 CENTER OF NW Colorado

Comments on the location information

  • 130 FT. WEST OF TUCKER GULCH; 0.2 MILE NW OF POINT WHERE TUCKER GULCH AND CRAWFORD GULCH MERGE TO FORM GOLDEN GATE CANYON ; INFO FROM LAND.ST :(1975)

Commodities

Commodity Importance
Uranium Primary
Copper Tertiary
Lead Tertiary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Pyrite Ore
Uraninite Ore
Ankerite Gangue
Calcite Gangue
Fluorite Gangue
Quartz Gangue

Analytical data

Result AVERAGE ORE GRADES OF 0.23 TO 0.26% U3O8

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

Nearby scientific data

(1) -105.29086, 39.77971
ListMap

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, Ascension Fault

Ore body information

  • Thickness 0.91M

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1955
Discoverer G.B. Friden
Year of first production 1956
Year of last production 1972

Mining district

District name Ralston Buttes District

Land status

Ownership category Private

Ownership information

  • Type Owner-Operator
    Owner Cotter Corp.
    Home office Golden, Co.
    First year 1972

Production statistics

  • Year 1956
    Material ORE U
    Accuracy Accurate
    Description Ap_Grade: ^0.23% U3o8
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major U3O8 Ore Uranium Uranium 0wt-pct
  • Year 1972
    Period 1956-1972
    Material ORE U
    Accuracy Estimate
    Description Cp_Grade: ^0.23% U3o8
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major U3O8 Ore Uranium Uranium 0wt-pct

Comments on the production information

  • NO PRODUCTION IN INTERVENING YEARS OR AFTER 1972. SHERIDAN AND OTHERS REPORT LOWER PRODUCTION THAN CITED ABOVE FOR 1960. CUMULATIVE ORE TOTAL INCLUDES ESTIMATED 853 ST FOR 1961 BASED ON AVERAGE ORE GRADE OF 0.23% U3O8.

Workings at the site

  • Type of workings Unknown
    Length 134.42M
    Overall depth 44.2M
    Overall length 92.96M

Comments on the workings information

  • SURFACE EXPLORATORY CUTS; 16-FT-LONG UPPER ADIT; 425 FT OF WORKINGS ON MAIN LEVEL FROM ADIT DRIVEN GENERALLY WESTWARD

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit BELT OF LAYERED CALC-SILICATE GNEISS TRENDS N 70 TO 90 E. DEPOSIT LIES ON BRANCH OF HURRICANE HILL FAULT SYSTEM KNOWN AS ASCENSION FAULT, WHICH TRENDS N 62 W, 66 TO 85 NE AND IS ACTUALLY COMPOSED OF SEVERAL SUBPARALLEL ANASTAMOSING FAULT SURFACES. ASCENSION FAULT FORMS V-SHAPED BLOCK WITH SECOND FAULT TO NE TRENDING LESS NW, BOTH SHOWING RIGHT-LATERAL DISPLACEMENT. PITCHBLENDE OCCURS AS COLLOFORM COATINGS ON QUARTZ- AND CARBONATE-CEMENTED BRECCIA FRAGMENTS IN HANGING WALL OF ASCENSION FAULT AND AS THIN STRINGERS ON SUBSIDIARY FAULTS AND FRACTURES.
Deposit DUPLICATE D002241 DELETED ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT

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.

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.