Unnamed (south of Jarvis Glacier)

Site Name

Primary: Unnamed (south of Jarvis Glacier)

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Commodity

Primary: Lead
Primary: Copper
Primary: Barium-Barite
Primary: Gold
Primary: Zinc
Primary: Silver

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Location

State: Alaska
District: Juneau (Skagway subdistrict)

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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: Massive sulfide, Besshi (Japanese deposits)
Model Name: Massive sulfide, kuroko

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Orebody

Not available

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Structure

Not available

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Alterations

Alteration Type: L
Alteration Text: Chloritic.

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Rocks

Not available

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Analytical Data

Not available

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Materials

Ore: Barite
Ore: Sphalerite
Ore: Pyrrhotite
Ore: Pyrite
Ore: Gold
Ore: Goethite
Ore: Galena
Ore: Chalcopyrite
Gangue: Calcite
Gangue: Chlorite
Gangue: Quartz

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Comments

Comment (Deposit): Model Name = Probably a Kuroko- or Besshi-type volcanogenic massive sulfide system with associated veining (Cox and Singer, 1986; models 28a or 24b).

Comment (Geology): Geologic Description = According to Still (1984 [OF 118-84]), these occurrences are located in the Little Jarvis volcanic-sedimentary sequence (Redman, 1983) that consists of northwesterly striking basalt, andesite, and metasediments that include slate and limestone. Most of the occurrences are within the 'Pzsv' unit that consists of slate, limestone and andesite. This unit is capped by andesite and pillow basalt. The Little Jarvis sequence may be the same age as the Glacier Creek sequence, which hosts the Main Zone/Palmer prospect (SK066) (Redman, 1983). Rubicon Minerals(1998) interprets this prospect to be the most northwesterly prospect along a mineral trend that extends to the southeast through the RW Zone prospect (SK067) and Main Zone/Palmer prospect (SK066) to the Red Creek prospect (SK063)? Still (1984 [OF 118-84] also cites an important mineralized exposure at an elevation of about 3,600 feet on the southwest side of the canyon shown as number 109 on figure 8. He describes this exposure as a zone of chlorite-altered metasediments and andesites containing lenses of massive and disseminated sulfide mineralization. The zone follows bedding, is up to 5 feet thick, and contains massive-sulfide lenses up to 0.5 feet across. It can be traced for about 100 feet or more. The sulfide lenses consist of pyrite, sphalerite, chalcopyrite, and galena in calcite- and quartz-rich rock. Samples contain up to 17.8% zinc, 0.3% lead, 1.3% copper, 11.56 ppm silver, and 0.163 ppm gold (Still, 1984 [OF 118-84]; Still and others, 1991). On the northeast side of the canyon just above the floor of the canyon at an elevation of 3,200 feet, quartz-stringer zones and sulfide zones are present. Samples of the sulfide zones at this site contained up to 6.1% zinc, 0.76% copper, 110 ppm cobalt, 4.64 ppm silver, and 0.127 ppm gold (Still, 1984 [OF 118-84]; Still and others, 1991). This prospect and other similar prospects in the Mt. Henry Clay area are probably correlative with the Windy Craggy deposit in Canada and the Greens Creek deposit on Admiralty Island and are therefore Late Triassic (Still and others, 1984 [OF 118-84]; Newberry and others, 1997).

Comment (Geology): Age = Probably Late Triassic based on correlation with the Greens Creek Mine on Admiralty Island and the Windy Craggy deposit in Canada (Still, 1984 [OF 118-84]); Newberry and others, 1997).

Comment (Exploration): Status = Inactive

Comment (Workings): Workings / Exploration = Sulfide float found by the U. S. Bureau of Mines at the mouth of the steep north-draining canyon lead to the initial discovery of some of the occurrences here in August, 1983. Other occurrences were discovered by ALYU Mining Corporation in September, 1983.

Comment (Reference): Primary Reference = Still, 1984 (OF 118-84)

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References

Reference (Deposit): Rubicon Minerals, 1998, Palmer VMS Project, southeast Alaska, Executive Summary: unpublished report by Rubicon Minerals Corporation, Vancouver, British Columbia, 25 p.

Reference (Deposit): Winkler, G.R., and MacKevett, E.M., Jr., 1970, Analyses of bedrock and stream-sediment samples from the Haines-Porcupine region, southeastern Alaska: U.S. Geological Survey Open-File Report 369, 91 p., 1 sheet, scale 1:125,000.

Reference (Deposit): MacKevett, E.M., Jr., Robertson, E.C., and Winkler, G.R., 1974, Geology of the Skagway B-3 and B-4 quadrangles, southern Alaska: U.S. Geological Survey Professional Paper 832, 33 p.

Reference (Deposit): Redman, E.C., 1983, Reconnaissance geology of the Glacier Creek area, Skagway B-4 quadrangle, Alaska, in Appendix B of Still, J.C., 1984, Stratiform massive sulfide deposits in the Mt. Henry Clay area, southeast Alaska: U.S. Bureau of Mines Open-File Report 118-84, 65 p.

Reference (Deposit): Still, J.C., Hoekzema, R.B., Bundtzen, T.K., Gilbert, W.G., Wier, K.R., Burns, L.E., and Fechner, S.A., 1991, Economic geology of Haines-Klukwan-Porcupine area, southeastern Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 91-4, 156 p., 5 sheets, scale 1:63,360.

Reference (Deposit): Gilbert, W.G., and Redman, E.C., 1989, Lode deposits, prospects, and occurrences of the Porcupine mining area, southeast Alaska: U.S. Bureau of Mines Open-File Report 17-89, 1 sheet, scale 1:39,600.

Reference (Deposit): Still, J.C., 1991, Bureau of Mines mineral investigations in the Juneau mining district, Alaska, 1984 - 1988, v. 2, Detailed mine, prospect, and mineral occurrence descriptions, section A, Haines-Klukwan-Porcupine subarea: U.S. Bureau of Mines of Mines Special Publication, 214 p.

Reference (Deposit): Still, J.C., Gilbert, W.G., and Forbes, R.B., 1987, Final report of stream sediment, float, and bedrock sampling in the Porcupine mining area, southeast Alaska, 1983-1985: U.S. Bureau of Mines Open-File Report 36-87, 35 p., 8 sheets.

Reference (Deposit): Still, J.C., 1984, Stratiform massive sulfide deposits in the Mt. Henry Clay area, southeast Alaska: U.S. Bureau of Mines Open-File Report 118-84, 65 p.

Reference (Deposit): Newberry, R.J., Crafford, T.C., Newkirk, S.R., Young, L.E., Nelson, S.W., and Duke, N.A., 1997, Volcanogenic massive sulfide deposits of Alaska, in Goldfarb, R.J. and Miller, L. D., eds., Mineral deposits of Alaska: Economic Geology Monograph 9, p. 120-150.

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