Last Shot

Site Name

Primary: Last Shot

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Commodity

Primary: Copper
Primary: Gold
Primary: Zinc
Primary: Lead
Primary: Silver
Secondary: Tungsten

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Location

State: Alaska
District: Hyder

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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

Year: 1917
Time Period: 1916-1917
Year: 1917
Time Period: 1916-1917
Year: 1917
Time Period: 1917-1917

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Deposit

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

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Physiography

Not available

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Mineral Deposit Model

Model Name: Polymetallic veins

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Orebody

Not available

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Structure

Not available

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Alterations

Not available

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Rocks

Name: Diorite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Early Jurassic

Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Early Jurassic

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Analytical Data

Not available

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Materials

Ore: Tetrahedrite
Ore: Sphalerite
Ore: Scheelite
Ore: Pyrrhotite
Ore: Pyrite
Ore: Galena
Ore: Freibergite
Ore: Chalcopyrite
Gangue: Quartz

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Comments

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

Comment (Geology): Geologic Description = The country rocks in the area of this site include: pelitic metasedimentary and subordinate andesitic metavolcanic strata of the Jurassic or Triassic Hazelton Group; recrystallized granodiorite of the Triassic Texas Creek Granodiorite, which intrudes the Hazelton rocks; quartz monzonite and granodiorite of the Hyder Quartz Monzonite batholith, which intrudes the Hazelton and Texas Creek rocks; and Tertiary lamprophyre dikes, which intrude all of the foregoing rock units (Smith, 1973, l977; Berg and others, 1988).? the deposit is in (Texas Creek) granodiorite and consists of sulfide-bearing quartz veins and stringer lodes, and of pyritized country rock adjacent to the veins (Buddington, 1929, p. 75-76; Elliott and others, 1978, loc. 2; Cobb and Elliott, 1980, p. 65). The principal vein is as much as 12 feet thick and contains an ore shoot of almost solid sulfides 8 to 18 inches thick, exposed for a length of at least 30 feet. The sulfide minerals are galena, pyrite, sphalerite, pyrrhotite, chalcopyrite, tetrahedrite, and freibergite.? the principal vein was explored in the early 1900s by surface pits and opencuts, and by a 25-foot adit. A 26-inch-long channel sample of the vein taken in 1951 contained 0.08 oz. Au/ton, 6.2% Pb, and 4.85% Cu (Byers and Sainsbury, 1956, p. 56). Altered (talcose) country rock adjacent to the vein contains sparsely disseminated grains of scheelite.? Maas and others (1995, p. 254) suggest that the age of the sulfide-bearing quartz fissure vein at the Last Shot prospect (p. 261 and fig. 66) is Eocene, based on similarities in mineralogy, structural setting, and hostrock, to lead-isotope-dated Eocene deposits nearby in the Hyder district. If so, the age of the deposit is roughly contemporaneous with emplacement of the Hyder Quartz Monzonite batholith.

Comment (Exploration): Status = Inactive

Comment (Geology): Age = Maas ands others (1995, p. 254) suggest that the age of the sulfide-bearing quartz fissure vein at the Last Shot prospect (p. 261 and fig. 66) is Eocene, based on similarities in mineralogy, structural setting, and hostrock, to lead-isotope-dated Eocene deposits nearby in the Hyder district. If so, the age of the deposit is contemporaneous with emplacement of the Hyder Quartz Monzonite batholith.

Comment (Workings): Workings / Exploration = The principal vein was explored in the early 1900s by surface pits and opencuts, and by a 25-foot adit. A 26-inch-long channel sample of the vein taken in 1951 contained 0.08 oz. Au/ton, 6.2% Pb, and 4.85% Cu (Byers and Sainsbury, 1956, p. 56). Altered (talcose) country rock adjacent to the vein contains sparsely disseminated grains of scheelite.

Comment (Reference): Primary Reference = Buddington, 1929 (B807); Byers and Sainsbury, 1956

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References

Reference (Deposit): Buddington, A.F., 1929, Geology of Hyder and vicinity, southeastern Alaska, with a reconnaissance of Chickamin River: U.S. Geological Survey Bulletin 807, 124 p.

Reference (Deposit): Smith, J.G., 1973, A Tertiary lamprophyre dike province in southeastern Alaska: Canadian Journal of Earth Sciences, v. 10, p. 408-420.

Reference (Deposit): Smith, J.G., 1977, Geology of the Ketchikan D-1 and Bradfield Canal A-1 quadrangles, Alaska: U.S. Geological Survey Bulletin 1425, 49 p.

Reference (Deposit): Byers, F.M., and Sainsbury, C.L., 1956, Tungsten deposits of the Hyder district, Alaska: U.S. Geological Survey Bulletin 1024-F, p. 123-140.

Reference (Deposit): Maas, K.M., Bittenbender, P E., and Still, J.C., 1995, Mineral investigations in the Ketchikan mining district, southeastern Alaska: U.S. Bureau of Mines Open-File Report 11-95, 606 p.

Reference (Deposit): Berg, H.C., Elliott, R.L., and Koch, R.D., 1988, Geologic map of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Mineral Investigations Series Map MF-1807,27 p., scale 1:250,000.

Reference (Deposit): Cobb, E.H., and Elliott, R.L., 1980, Summaries of data on and lists of references to metallic and selected nonmetallic mineral deposits in the Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-File Report 80-1053, 154 p.

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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