Hanging Glacier

Prospect, Active

Commodities and mineralogy

Main commodities Ag; Au; barite; Cu; Pb; Zn
Ore minerals barite; chalcopyrite; galena; gold; pyrite; sphalerite

Geographic location

Quadrangle map, 1:250,000-scale SK
Quadrangle map, 1:63,360-scale B-4
Latitude 59.387
Longitude -136.4248
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Hanging Glacier prospect is between an elevation of 5,100 and 5,700 feet above a small unnamed hanging glacier that is about a mile and a half west of the terminus of the Saksaia Glacier. It is about 0.5 mile south-southwest of the center of section 1, T. 29 S., R. 53 E.

Geologic setting

Geologic description

Mineralization in this area was discovered in 1969 by Merrill Palmer and associates and has been explored by a succession of companies including Alyu Mining in 1976 and 1977; Anaconda Minerals in 1979 and 1980; Southeastern Minerals from 1980 to 1983; Bear Creek Mining from 1983 to 1985; Newmont Exploration from 1987 to 1989; Granges Exploration Ltd. in 1989; Cominco Alaska from 1990 to 1993; Kennecott Minerals from 1993 to 1997, Rubicon Minerals from 1998 to 2000; and Toquima Minerals Corp. in 2004. It was also mapped and sampled by the U.S. Geological Survey (MacKevett 1974) and the U.S. Bureau of Mines (Still, 1984), and the Alaska Division of Geological and Geophysical Surveys (Still and others, 1991). In 2006, Constantine Metal Resources acquired the property under a long-term lease and they have been actively explored it to the present (early 2011). Their work has included detailed geologic mapping and sampling, and ground geochemical and geophysical surveys. The Hanging Glacier prospect has almost certainly been mapped, sampled, and covered by geochemical and geophysical surveys by several of the companies that have worked in the area. It is now part of the large block of claims held by Constantine. It has not been drilled.
As described by Still (1984 [OF 118-84]) and Still and others (1991), the Hanging Glacier prospect is an iron-stained zone of Late Triassic, Hyd Group metasediments and hydrothermally altered metabasalt several hundred feet thick and about 2,000 feet long that strikes northeast and dips steeply north. The mineralization consists of barite lenses up to several feet thick and quartz-calcite ladder veins up to 0.5 feet thick. Both lenses and veins contain barite, pyrite, sphalerite, galena, and minor chalcopyrite. Samples from the lenses and veins contain up to 54 percent barium, 14.1 percent zinc, 0.35 percent copper, 0.37 percent lead, 19.36 parts per million (ppm) silver, and 0.244 ppm gold. MacKevett and others (1974) note that ladder veins occur within a 4- to 8-foot-thick altered dike that cuts the metavolcanic rocks. The ladder veins are as much as 6 inches thick and contain quartz, calcite, sphalerite, galena and minor chalcopyrite. They describe the barite lenses as a baritic footwall vein that contains abundant galena and minor pyrite, sphalerite, and chalcopyrite.
Samples collected by Rubicon Minerals (1998) contained up to 18.25 percent zinc, 0.11 percent copper, 0.05 percent lead, 0.49 ppm gold, and 36.2 ppm silver. Rubicon surmised that the Hanging Glacier prospect was a volcanogenic massive-sulfide system that could be stratigraphically higher than the Cap (SK060) and Nunatak (SK058) prospects or, alternatively, a structural repetition of the Cap-Nunatak horizon (Rubicon Minerals, 1998).
There have been several published studies of the mineral deposits in the area by government and academe (MacKevett and others, 1974; Still, 1984, Still and others, 1991; Newberry and others, 1997; Greig and Giroux, 2010) and unpublished studies by industry. The consensus from early on was that the they are Late Triassic, stratiform volcanogenic massive-sulfide deposits.
Geologic map unit (-136.426666764727, 59.3866607737351)
Mineral deposit model Probably a volcanogenic massive-sulfide deposit with associated veining, some of which may be due to remobilization during deformation and metamorphism (Cox and Singer, 1986; models 28a or 24b).
Mineral deposit model number 28a or 24b
Age of mineralization Late Triassic by analogy with other similar deposits of that age along the length of southeastern Alaska and into Canada.
Alteration of deposit Quartz-sericite-pyrite alteration associated with baritic massive-sulfide mineralization.

Production and reserves

Workings or exploration Mineralization in this area was discovered in 1969 by Merrill Palmer and associates and has been explored by a succession of companies including Alyu Mining in 1976 and 1977; Anaconda Minerals in 1979 and 1980; Southeastern Minerals from 1980 to 1983; Bear Creek Mining from 1983 to 1985; Newmont Exploration from 1987 to 1989; Granges Exploration Ltd. in 1989; Cominco Alaska from 1990 to 1993; Kennecott Minerals from 1993 to 1997, Rubicon Minerals from 1998 to 2000; and Toquima Minerals Corp. in 2004. It was also mapped and sampled by the U.S. Geological Survey (MacKevett 1974) and the U.S. Bureau of Mines (Still, 1984), and the Alaska Division of Geological and Geophysical Surveys (Still and others, 1991). In 2006, Constantine Metal Resources acquired the property under a long-term lease and they have been actively explored it to the present (early 2011). Their work has included detailed geologic mapping and sampling, and ground geochemical and geophysical surveys. The Hanging Glacier prospect has almost certainly been mapped, sampled, and covered by geochemical and geophysical surveys by several of the companies that have worked in the area. It is now part of the large block of claims held by Constantine. It has not been drilled.
Indication of production None
Reserve estimates None.
Production notes None.

References

MRDS Number A013091

References

Greig, C.J., and Giroux, G.H., 2010, Palmer VMS project, southeast Alaska; Mineral resource estimation and exploration update: Technical l report for Constantine Metal Resources Ltd. 82 p. (posted on www.sedar.com, Mar. 8, 2010).
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.
Rubicon Minerals, 1998, Palmer VMS Project, southeast Alaska, Executive Summary: Unpublished report by Rubicon Minerals Corporation, Vancouver, British Columbia, 25 p.
Reporters T.C. Crafford (T. Crafford & Associates, Anchorage); D.J. Grybeck (Contractor, USGS)
Last report date 2/28/2011