Unnamed (southwest of Mt. Parker)

Site Name

Primary: Unnamed (southwest of Mt. Parker)

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Commodity

Primary: Gold
Secondary: Silver
Secondary: Zinc
Secondary: Arsenic

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Location

State: Alaska
District: Juneau

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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: Occurrence
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: Rossman (1959, B 1058-B, p. 56) reported alteration along the 4500-foot length of the structure. In general veins of the area are altered for as much as 10-15 feet on each side of the controlling fault structures; the alteration products include ankerite.

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Rocks

Name: Granite
Role: Associated
Age Type: Associated Rock
Age Young: Late Cretaceous

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Analytical Data

Not available

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Materials

Ore: Arsenopyrite
Ore: Pyrite
Ore: Sphalerite
Gangue: Quartz

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Comments

Comment (Exploration): Status = Inactive

Comment (Deposit): Other Comments = the occurrence is of interest because of the strength and continuous nature of the vein-fault structure. Possibly, gold-bearing veins could occur in subsidiary tensional structures or at vein intersections. Rossman's main map (B 1058-B) suggests that the northeast vein-fault will intersect the projection of the northwest striking Ptarmigan Creek fault under cover in Ptarmigan Creek basin. (The Ptarmigan Creek fault appears to be the fundamental control of the Highland Chief prospect--MF030) No near term exploration is expected because the occurrence is in Glacier Bay National Park and Preserve.

Comment (Geology): Age = Late Cretaceous or younger.

Comment (Workings): Workings / Exploration = The vein-fault has only been traced on the surface. Prospectors who examined mineralized segments of the vein thought it contained ferberite, but Rossman identified the dark mineral as iron-rich sphalerite (Rossman, 1959, p. 55-56). No assays are given, probably owing to the absence of visible free gold in the vein-fault structure.

Comment (Deposit): Model Name = Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).

Comment (Geology): Geologic Description = A prominent locally mineralized fault cuts granodiorite of Cretaceous age on the ridge south of Mt. Parker, and enters the major cataclasite schist zone of the Ptarmigan basin to the northeast (Rossman, 1959, B 1058-B, pl. 4; Brew and others, 1978, pl. 1A). A 200-foot long quartz-bearing segment exposed on the west side of the Ptarmigan Creek basin is in schistose (cataclasite); a hydrothermally altered segment mapped by Rossman above Lamplugh Glacier is in granodiorite.? the vein-fault is traceable for 4500 feet. It is one of the strongest mineralized structures in the Reid Inlet gold area (Kimball and others, 1978). In addition to quartz, mineralized segments contain arsenopyrite, pyrite and black sphalerite.

Comment (Reference): Primary Reference = Rossman, 1959 (B 1058-B)

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References

Reference (Deposit): Rossman, Darwin, 1959, Geology and ore deposits in the Reid Inlet area, Glacier Bay, Alaska: U.S. Geological Survey Bulletin 1058-B, p. 33-58.

Reference (Deposit): Brew, D.A., Johnson, B.R., Grybeck, D., Griscom, A., Barnes, D.F., Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources of the Glacier Bay National Monument Wilderness Study Area, Alaska: U.S. Geological Survey Open-File Report 78-494, 670 p.

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The Top Ten Gold Producing States

These ten states contributed the most to the gold production that built the West from 1848 through the 1930s. The Top Ten Gold Producing States.