Holland

Site Name

Primary: Holland
Secondary: Little Willie
Secondary: Bronson and France

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Commodity

Primary: Gold
Secondary: Molybdenum
Secondary: Lead
Secondary: Copper

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Location

State: Alaska
District: Willow Creek

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Land Status

Not available

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Holdings

Not available

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Workings

Not available

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Ownership

Not available

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Production

Not available

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Deposit

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

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Physiography

Not available

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Mineral Deposit Model

Model Name: Low-sulfide Au-quartz vein

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Orebody

Not available

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Structure

Not available

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Alterations

Alteration Type: L
Alteration Text: Wall-rock alteration within a few inches of the veins is intense, but seldom extends more than 10 to 12 inches beyond the quartz filling. Sericitization and carbonate alteration predominate, but there is some pyritization and in the outer parts of the alteration zone chloritization is present (Ray, 1954).

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Rocks

Not available

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Analytical Data

Not available

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Materials

Ore: Bornite
Ore: Chalcopyrite
Ore: Galena
Ore: Gold
Gangue: Quartz

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Comments

Comment (Deposit): Other Comments = This listing includes reference to Bronson and France. It appears that this prospect was a result of Little Willie property being restaked (Jasper, 1962).

Comment (Deposit): Model Name = Low-sulfide Au-quartz veins ? (Cox and Singer, 1986; model 36a ?)

Comment (Exploration): Status = Inactive

Comment (Geology): Age = Late Cretaceous or younger; vein cuts the Late Cretaceous Willow Creek Pluton.

Comment (Reference): Primary Reference = Ray, 1954

Comment (Workings): Workings / Exploration = Very little development occurred. Workings were all on the surface. The amount of copper contained in this deposit appears to be very small.

Comment (Geology): Geologic Description = Late Cretaceous tonalite of the Willow Creek Pluton contains a sheared composite quartz vein and pegmatite dike. The vein strikes N 77 W, and dips 26 NE. The central quartz zone consists of a 6 ft central band of quartz bounded by a 1 ft pegmatite hanging wall and a 16 in pegmatite footwall (Ray, 1954). Pegmatite dike shows that reopening took place after consolidation of pegmatite. Glassy quartz was then deposited between pegmatite walls. The quartz and pegmatite again fractured; chalcopyrite, bornite, and pyrite were deposited in fractures and replaced orthoclase in pegmatite (Ray, 1933). Quartz contains stringers of sulfides - including an unidentified bismuth (?) mineral - up to 1 ft long, but less than 2 inches thick (Ray, 1954). Quartz float contains dessiminated molybdenite flakes and free gold (Capps and Tuck, 1935).? the Willow Creek Pluton is a zoned pluton: the outer part consists of hornblende quartz diorite and lesser hornblende tonalite; the core consists of hornblende-biotite granodiorite, and lesser hornblende-biotite quartz monzodiorite and biotite quartz monzonite. Wall-rock alteration within a few inches of the veins is intense, but seldom extends more than 10 to 12 inches beyond the quartz filling. Sericitization and carbonate alteration predominate, but there is some pyritization and in the outer parts of the alteration zone chloritization is present (Ray, 1954).

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References

Reference (Deposit): Jasper, M.W., 1962, Willow Creek gold district activity, Anchorage quadrangle: Alaska Division of Mines and Minerals report for the year 1962, p. 75-84.

Reference (Deposit): Wedow, Helmuth, Jr., White, M.G. and Moxham, R.M., 1952, Interim report on an appraisal of the uranium possibilities of Alaska: U.S. Geological Survey Open-File Report 51, 123 p.

Reference (Deposit): Moxham, R.M., and Nelson, A.E., 1952, Reconnaissance for radioactive deposits in south-central Alaska, 1947-1949: U.S. Geological Survey Circular 184, 14 p.

Reference (Deposit): MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.

Reference (Deposit): Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials in the Anchorage quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-1095, 184 p.

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Anchorage quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-409, 1 sheet, scale 1:250,000.

Reference (Deposit): Capps, S.R., 1919, Gold lode mining in the Willow Creek district: U.S. Geological Survey Bulletin 692-D, p. 177-186.

Reference (Deposit): MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.

Reference (Deposit): Ray, R.G., 1954, Geology and ore deposits of the Willow Creek Mining district, Alaska: U.S. Geological Survey Bulletin 1004, 86 p.

Reference (Deposit): Ray, J.C., 1933, The Willow Creek gold-lode district, Alaska: U.S. Geological Survey Bulletin 849-C, p. 165-229.

Reference (Deposit): Capps, S.R., and Tuck, Ralph, 1935, The Willow Creek-Kashwitna District, Alaska: U.S. Geological Survey Bulletin 864-B, p. 95-113.

Reference (Deposit): Silberman, M.L., O'Leary, R.M., Csejtey, B. Jr., Smith, J.G., and Conner, C.L., 1978, Geochemical anomalies and isotopic ages in the Willow Creek mining district, southwestern Talkeetna Mountains, Alaska: U.S. Geological Survey Open-File Report 78-223, 33 p.

Reference (Deposit): Chapin, Theodore, 1921, Lode developments in the Willow Creek district: U.S. Geological Survey Bulletin 714-E, p. 201-206.

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