Lookout No. 22 Mine

Site Name

Primary: Lookout No. 22 Mine

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Commodity

Primary: Uranium
Tertiary: Copper
Tertiary: Zinc
Tertiary: Lead

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Location

State: Colorado
County: Saguache
District: Marshall Pass District

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Land Status

Land ownership: National Forest
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.

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Holdings

Not available

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Workings

Not available

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Ownership

Owner Name: Gibraltar Minerals
Home Office: Dallas, Tx.
Years: 1964 -

Owner Name: Cotter Corp.
Home Office: Canon City, Co.
Years: 1964 -

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Production

Year: 1961
Time Period: 1954-1961
Description: Cp_Grade: ^0.25% U308 (Lookout Nos. 24, 33)
Year: 1960
Time Period: 1956-1960
Mined: 462.570 mt
Description: Cp_Grade: ^1.17% U308 (Lookout No. 22)

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Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Surface
Year First Production: 1956
Year Last Production: 1960
Discovery Year: 1956
Discovery Method: Ore-Mineral Not In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S

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Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Southern Rocky Mountains

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Mineral Deposit Model

Not available

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Orebody

Name: 2
Form: tabular, lenticular

Name: 1
Form: irregular

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Structure

Type: R
Description: Sawatch Range, San Juan Volcanic Field

Type: L
Structure: Chester Fault
Description: Chester Fault

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Alterations

Alteration Type: L
Alteration: sericite, bioitie oxidation
Alteration Text: Sericitization; Alteration Of Biotite To Fe Oxides; Supergene Alteration Of Uranium Minerals

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Rocks

Name: Pegmatite
Role: Associated
Age Type: Associated Rock
Age Young: Mesoproterozoic

Name: Pegmatite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Mesoproterozoic

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Analytical Data

Analytical Data: ALTERED SCHIST, 3.96. BULK ASSAY OF BAGGED ORE YIELDED 48.61% V308, 2.82% FEO-FE203, 1.68% AS203, 0.60% CUO, 0.33% P205, 0.17% SO4, 0.15% CAO, 0.10% MO02, 0.08% F, 0.06% V205, 0.04% CO2. FLUOROMETRIC ANALYSIS OF FIVE SOIL SAMPLES ABOVE AND BELOW SITE YIELDED 0.001 TO 0.02% U. SPECTROGRAPHIC ANALYSIS OF SAME SAMPLES GAVE 3% FE, 1.5% MG, 0.7% CA, 3% NA, 3% K, 0.3% TI, 0.07 TO 0.15% MN, TR TO 0.003% B, 0.07% BA, 0.0003% BE, TR CE, 0.0007 TO 0.0015% CO, 0.003 TO 0.007% CR, 0.0015 TO 0.007% CU, 0.0015 TO 0.003% GA 0.003% TO 0.007% LA, 0.0007 TO 0.0015% MO, 0.0015 TO 0.003% NB, TR ND, 0.0007 TO 0.0015% NI, 0.003 TO 0.015% PB, 0.0015% SC, 0.007 TO 0.015% SR, 0.003 TO 0.015% V, 0.007 TO 0.03% Y, 0.0007 TO 0.003% YB, 0.03% ZR
Analytical Data: ALLUVIUM, 2.31
Analytical Data: ORE FINES AND SCRAP, 25.38
Analytical Data: COARSE YELLOW ORE, 31.72
Analytical Data: YELLOW HIGH-GRADE OXIDIZED ORE, 34.54
Analytical Data: ASSAYS OF DIFFERENT TYPES OF ORES, IN % V308: BLACK HIGH-GRADE PITCHBLENDE, 71.96

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Materials

Ore: Uraninite
Ore: Uranophane
Ore: Pitchblende
Gangue: Galena
Gangue: Boltwoodite
Gangue: Limonite
Gangue: Marcasite
Gangue: Pyrite
Gangue: Covellite
Gangue: Chalcopyrite
Gangue: Sphalerite
Gangue: Chalcocite

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Comments

Comment (Development): PRODUCTION ENDED BY 1960 OR 1961 BUT SOME CLAIMS WERE EXPLORED BY TUNNELS AND DIAMOND DRILLING AS LATE AS 1964

Comment (Production): GROSS (1965) REPORTS THAT 10,300 LB OF ORE MINED FROM COLLUVIUM IN 1956, FOLLOWED BY 500 LB ORE FROM SMALL MASS TO NW. THEN 42 TONS SCRAP MATERIAL AND ALLUVIUM WERE SHIPPED AT GRADE OF 4.39% V308. FINALLY 360 TONS BEDROCK ORE SHIPPED AT AVERAGE GRADE 0.55 TO 0.60% U308

Comment (Deposit): MOST HIGH-GRADE ORE REPLACED QUARTZ-FELDSPAR-BIOTITE SCHIST IN NE-TRENDING FAULT ZONE NEXT TO PEGMATITE. EARLY ORE SOLUTIONS, AIDED BY HEMATITIC ALTERATION, PRECIPITATED VEIN QUARTZ AND COLLOFORM PITCHBLENDE. AFTER FRACTURING AND BRECCIATION, SOLUTIONS DEPOSITED PITCHBLENDE AS BANDED OVERGROWTHS. TETRAHEDRITE THAT FILLED FRACTURES AND MATRIX ALTERED TO CU SULFIDES. SUPERGENE ALTERATION OF VEIN PITCHBLENDE PRODUCED SUITE OF SECONDARY URANIUM MINERALS DOMINATED BY SCHOEPITE. MINERALIZATION DECREASES WITH DEPTH IN FAULT ZONE. HIGH-GRADE ORE FIRST CAME FROM 6-FT-THICK REGOLITH OR COLLUVIUM OVERLYING BEDROCK.

Comment (Workings): ORIGINAL LOOKOUT 22 DEVELOPED BY OPEN PIT IN ALLUVIUM AND UNDERLYING BEDROCK, ON NEARBY LOOKOUT NO. 33, FIVE TUNNELS DRIVEN FROM 20 TO 600 FT IN LENGTH WITH SEVERAL HUNDRED FEET OF DRIFTS AND CROSSCUTS

Comment (Deposit): REMAINDER OF LOOKOUT BLOCK OF CLAIMS (15 THRU 34) LIES IN SE SEC. 21, S2 SEC. 22, E2 AND NW SEC. 27, NE SEC. 28, T48N, R6E ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT

Comment (Location): ON WEST SIDE OF HARRY CREEK 2 MILES WNW OF MARSHALL PASS ; INFO FROM LAND.ST :1976

Comment (Commodity): BASE-METAL ORE MINERALS CONSIDERED AS OCCURRENCES

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References

Reference (Deposit): OLSON, J.C., 1977, PRELIMINARY GEOLOGIC MAP OF PART OF THE PAHLONE PEAK QUADRANGLE, GUNNISON, SAGUACHE, AND CHAFFEE COUNTIES, COLORADO: USGS OPEN-FILE REPT. 77-325.

Reference (Deposit): GROSS, E.B., 1965, A UNIQUE OCCURRENCE OF URANIUM MINERALS, MARSHALL PASS, SAGUACHE COUNTY, COLORADO: AM. MINERALOGIST, V. 50, NOS. 7-8, P. 909-923.

Reference (Deposit): RANSPOT, H.W., 1958, GEOLOGY AND URANIUM DEPOSITS OF THE INDIAN CREEK AREA, GUNNISON AND SAGUACHE COUNTIES, COLORADO: UNIV. COLORADO M.S. THESIS

Reference (Deposit): NELSON-MOORE, J.L., COLLINS, D.B., AND HORNBAKER, A.L., 1978, RADIOACTIVE MINERAL OCCURRENCES OF COLORADO AND BIBLIOGRAPHY: CGS BULL. 40, P. 391

Reference (Production): NELSON-MOORE AND OTHERS, 1978

Reference (Deposit): WRIGHT, R.J., AND EVERHART, D.L., 1960, URANIUM--MARSHALL PASS DISTRICT, IN DEL RIO, S.M., MINERAL RESOURCES OF COLORADO-FIRST SEQUEL: COLORADO STATE MINERAL RESOURCES BOARD, P. 357-359.

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