Unnamed Prospect (ARDF - SK069; on west side of Little Jarvis Glacier), Skagway District, Juneau District, Haines Borough, Alaska, USA
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Location: This prospect is about 3 miles, N38E from the summit of Mt. Henry Clay at an elevation of approximately 3,500 feet. It is near the southeast corner of section 29, T. 28 S., R. 53 E. of the Copper River Meridian. Still and others (1991) informally named this the 'Little Jarvis' prospect, but also included another prospect on the east side of the Little Jarvis Glacier under the same name. This record applies only to the prospect on the west side of the Little Jarvis Glacier. The prospect on the east side of the glacier has been grouped with the RW Zone prospect (SK067).
Geology: Still and others (1991) describe this prospect as small discontinuous sulfide bands in metasedimentary and metavolcanic rocks. Samples contained up to 0.345 ppm gold, 11.8 ppm silver, 13.6% zinc, 1,900 ppm copper, 3.8% lead, 1.44% barium, and 2,000 ppm arsenic. Rubicon Minerals (1998) interprets this prospect to occur on a northwest mineral trend along the apex of a shallowly plunging, northwest-trending antiform. This mineral trend extends from the unnamed occurrences (SK070) at the northwest end through the RW Zone prospect (SK067) and Main Zone/Palmer prospect (SK066) to the Red Creek prospect (SK063) at the southeast end. 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: 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, 1984 [OF 118-84]; Newberry and others, 1997).
Commodities (Major) - Ag, Au, Ba, Cu, Pb, Zn
Development Status: None
Deposit Model: Probably a Besshi- or Kuroko-type volcanogenic massive sulfide (Cox and Singer,
4 entries listed. 4 valid minerals.
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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. 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. 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. Rubicon Minerals, 1998, Palmer VMS Project, southeast Alaska, Executive Summary: Unpublished report by Rubicon Minerals Corporation, Vancouver, British Columbia, 25 p. Rubicon Minerals, 1999, Press releases from 1999 drill exploration program: Internet site of Rubicon Minerals Corporation, Vancouver, British Columbia (http://www.rubiconminerals.com) Still, J.C., 1991, Bureau of Mines mineral investigations in the Juneau mining district, Alaska, 1984-1988; Volume 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. 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. 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. Still, J.C., Weir, K.R., Gilbert, W.G., and Redman, E.C., 1984, Stream-sediment, float, and bedrock sampling in the Porcupine mining area, southeast Alaska: U.S. Bureau of Mines Open-File Report 173-84, 16 p., 1 sheet.