Unnamed (south of Jarvis Glacier)

Occurrence in Alaska, United States with commodities Silver, Gold, Barium-Barite, Copper, Lead, Zinc

Geologic information

Identification information

Deposit ID 10002194
MRDS ID A013092
Record type Site
Current site name Unnamed (south of Jarvis Glacier)

Geographic coordinates

Geographic coordinates: -136.45214, 59.41974 (WGS84)
Relative position This site includes several mineralized exposures on the south side of the Jarvis Glacier in a steep walled canyon about 4 miles east-southeast from the Pleasant Camp border station on the Haines Highway. They are in the NE1/4, section 30, T. 28 S., R. 53 E. of the Copper River Meridian. The location corresponds to sample location 109 in Figure 8 of Still (1984 [OF 118-84]) and was informally termed the 'Jarvis Glacier Gulches' prospect by Still and others (1991).
(click for info)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Barium-Barite Primary
Copper Primary
Lead Primary
Zinc Primary

Materials information

Materials Type of material
Barite Ore
Chalcopyrite Ore
Galena Ore
Goethite Ore
Gold Ore
Pyrite Ore
Pyrrhotite Ore
Sphalerite Ore
Calcite Gangue
Chlorite Gangue
Quartz Gangue

Alteration

  • (Local) Chloritic.

Mineral occurrence model information

Model code 184
USGS model code 28a
Deposit model name Massive sulfide, kuroko
Mark3 model number 93
Model code 91
USGS model code 24b
Deposit model name Massive sulfide, Besshi (Japanese deposits)
Mark3 model number 30

Host and associated rocks

  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite

Nearby scientific data

(1) -136.45214, 59.41974

Comments on the geologic information

  • 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).
  • 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).

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Both metallic and non-metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Juneau (Skagway subdistrict)

Comments on the workings information

  • 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.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A013092
USGS Alaska Resource Data File ARDF SK070

Bibliographic references

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • Deposit

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

  • 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.

Comments on the references

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

General comments

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

Reporter information

Type Date Name Affiliation Comment
Reporter 04-FEB-2001 T.C. Crafford T. Crafford & Associates