McLeod East

The McLeod East is a molybdenum mine located in Alaska.

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

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Site Name

Primary: McLeod East

Commodity

Primary: Molybdenum
Secondary: Manganese
Secondary: Lead
Secondary: Tin
Secondary: Tungsten
Secondary: Silver
Secondary: Copper

Location

State: Alaska
District: Kaiyuh

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Climax Mo
Model Name: Porphyry Mo, low-F

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: The granitic stock is sericitized and locally intensely silicified.

Rocks

Role: Host
Age Type: Host Rock
Age Old: Late Jurassic

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Ore: Molybdenite
Ore: Pyrite
Ore: Ferrimolybdite
Gangue: Quartz
Gangue: Zircon

Comments

Comment (Geology): Age = Host rock is Tertiary - Cretaceous.

Comment (Geology): Age = Cretaceous or Tertiary, the presumed age of the mineralized felsic intrusive hostrock.

Comment (Geology): Age = The molybdenite-bearing veins presumably are related to the cooling phase of the Upper Cretaceous or Tertiary porphyritic granite stock.

Comment (Workings): Workings / Exploration = This occurrence was discovered during reconnaissance mapping and sampling during 1979 (Bressler and others, 1979). No further work is documented.

Comment (Reference): Primary Reference = Bressler and others, 1979

Comment (Deposit): Model Name = Vein and porphyry Mo (Cox and Singer, 1986; model 16a, 21b)

Comment (Deposit): Model Number = 16a, 21b

Comment (Deposit): Other Comments = This property is on Doyon, Ltd. selected lands. For more information, contact Doyon, Ltd., in Fairbanks, Alaska.

Comment (Geology): Geologic Description = This occurrence consists of disseminated molybdenite in talus of quartz-veined and sericitically-altered felsic intrusive rock along the southern margin of a small stock that intrudes Cretaceous strata (Bressler and others, 1979). The strata include poorly sorted, medium- to coarse-grained arkosic sandstone and subordinate siltstone, shale, and lesser intermediate to mafic volcanic rocks. The beds generally strike northwest and dip gently to the northeast and southwest (Bressler and others, 1979). The stock is leucocratic, quartz-feldspar porphyry composed of 20-40% bipyramidal to subhedral quartz and 10-30% feldspar phenocrysts in a matrix dominantly of quartz and feldspar. The stock is exposed in an area of about 2500 by 6000 feet that is elongate to the northeast. The exposure is centered along the boundary of sections 32 and 33, and the stock sends dike swarms into sections 4 and 28 (Bressler and others, 1979).? A younger suite of biotite-quartz-feldspar porphyry dikes exposed to the west at the McLeod prospect (UL003) apparently does not occur at this site (Bressler and others, 1979).? Also see UL003 and UL004.

Comment (Geology): Age = Late Cretaceous or Tertiary, the age of the granitic stock and its apophyses.

References

Reference (Deposit): Boniwell, J.B., 1981, Airborne geophysics over the McLeod prospect, Kaiyuh Mountains, Nulato, Alaska: Doyon Report 81-05, 9 p. (Report held by Doyon, Ltd., Fairbanks, Alaska).

Reference (Deposit): Boniwell, J.B., 1981, An addendum to the report on airborne geophysics over the McLeod prospect, Kaiyuh Mountains, Nulato, Alaska: Doyon Report 81-08, 16 sheets. (Report held by Doyon, Ltd., Fairbanks, Alaska.)

Reference (Deposit): Bressler, J., Cleveland, G., Ruzicka, J., 1979, 1979 annual progress report McLeod project area: Doyon Report 79-33, 48 p. (Report held by Doyon, Ltd., Fairbanks, Alaska).

Reference (Deposit): Lessman, J., 1979, Doyon project 1979 annual progress report: Doyon Report 79-31, 5 p. (Report held by Doyon, Ltd., Fairbanks, Alaska).

Reference (Deposit): Joesting, H.R., 1943, Strategic mineral occurrences in interior Alaska, supplement to pamphlet no. 1: Alaska Territorial Department of Mines Pamphlet 2, 26 p.

Reference (Deposit): Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Candle, Holy Cross, Norton Bay, Nulato, and Unalakleet quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-866, 102 p.

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