Unnamed (southeast of Blunt Mountain)

The Unnamed (southeast of Blunt Mountain) is a silver, zinc, lead, copper, and gold mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Unnamed (southeast of Blunt Mountain)

Commodity

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

Location

State: Alaska
District: Ketchikan

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Polymetallic veins

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Rhyolite is sericitized and pyritic in shear zones and adjacent to quartz veins.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pyrite
Ore: Hematite
Ore: Galena
Ore: Chalcopyrite
Ore: Barite
Gangue: Quartz

Comments

Comment (Reference): Primary Reference = Berg, 1972 (I 684); Karl, 1992

Comment (Deposit): Model Name = Polymetallic veins (Cox and Singer, 1986; model 22c)

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

Comment (Geology): Geologic Description = The country rocks in the area of this site are recrystallized, Upper Triassic carbonate and clastic rocks, rhyolite, and basalt (Berg, 1972). The rocks are complexly folded and faulted, and were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. All of the mineral deposits are hosted by metarhyolite and tuff.? the deposits consist of sparsely mineralized, sulfide-bearing, locally vuggy quartz veins up to 3 feet thick, in sheared, sericitized, and chloritized rhyolite and tuff (Berg, 1972, locs. 1, 2; Karl, 1992, locs. 30, 31). Some of the mineralized shear zones are up to 10 feet wide and have been traced on the surface for 40 feet. The chief sulfide mineral is pyrite, which also is sparsely disseminated in the altered rhyolite adjacent to the veins. Other sulfide minerals, inferred from sample assays, probably include galena, chalcopyrite, sphalerite, and barite. Minor hematite is reported in some of the veins.? the deposits were explored in the 1930s by a 110-foot-long, NE-trending adit, and in the 1970s by trenches, shallow pits, and soil surveys (Berg, 1972; Karl, 1992). Selected samples of mineralized quartz veins and stringers collected by the USGS in the 1930s contained up to 0.05 oz. Au/ton, 20.60 oz. Ag/ton, 4.63% Cu, 9.75% Pb, and 13.14% Zn (Berg, 1972. loc. 1). Samples of variously mineralized quartz veins and of altered rhyolite collected by the USGS in the early 1990s contained as much as 2.68 oz. Au/ton, 8.75 oz. Ag/ton, 200 ppm Cu, 1000 ppm Pb, 200 ppm Zn, and more than 5000 ppm Ba (Karl, 1992, locs. 30a, 31). A limonitic quartz vein sampled in the 1970s by private interests contained 0.93 oz. Au/ton; and soil samples that they collected contained up to 0.9 ppm Au (Karl, 1992, loc. 30c).

Comment (Workings): Workings / Exploration = The deposits were explored in the 1930s by a 110-foot-long, NE-trending adit, and in the 1970s by trenches, shallow pits, and soil surveys (Berg, 1972; Karl, 1992). Selected samples of mineralized quartz veins and stringers collected by the USGS in the 1930s contained up to 0.05 oz. Au/ton, 20.60 oz. Ag/ton, 4.63% Cu, 9.75% Pb, and 13.14% Zn (Berg, 1972. loc. 1). Samples of variously mineralized quartz veins and of altered rhyolite collected by the USGS in the early 1990s contained as much as 2.68 oz. Au/ton, 8.75 oz. Ag/ton, 200 ppm Cu, 1000 ppm Pb, 200 ppm Zn, and more than 5000 ppm Ba (Karl, 1992, locs. 30a, 31). A limonitic quartz vein sampled in the 1970s by private interests contained 0.93 oz. Au/ton; and soil samples that they collected contained up to 0.9 ppm Au (Karl, 1992, loc. 30c).

References

Reference (Deposit): Berg, H.C., 1972, Geologic map of Annette Island, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-684, 8 p., 1 sheet, scale 1:63,360,

Reference (Deposit): Karl, S.M., 1992, Map and table of mineral deposits on Annette Island, Alaska: U.S. Geological Survey Open-File Report 92-690, 57 p., 1 map, scale 1:63,360.

Reference (Deposit): Elliott, R.L., Berg, H.C., and Karl, Susan, 1978, map and table describing metalliferous and selected nonmetalliferous mineral deposits, Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-file Report, 78-73-B,17 p., scale 1:250,000.

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