Lake

The Lake is a zinc and lead 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: Lake

Commodity

Primary: Zinc
Primary: Lead

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

Not available

Rocks

Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Late Cretaceous

Analytical Data

Not available

Materials

Ore: Galena
Ore: Pyrite
Ore: Sphalerite
Gangue: Quartz

Comments

Comment (Reference): Primary Reference = Wright and Wright, 1908

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

Comment (Deposit): Other Comments = Wright and Wright refer to this property as 'Lake claims nos. 1, 2, and 3.' ?The site is at the boundary of, or within, Misty Fiords National Monument Wilderness.

Comment (Geology): Geologic Description = The country rocks in this part of Revillagigedo Island are marine, interbedded, andesitic and basaltic metavolcanic rocks and subordinate pelitic metasedimentary rocks that are intruded by stocks, sills, and dikes of Cretaceous feldspar-porphyritic granodiorite (Berg and others, 1988). The strata and some of the granodiorite were regionally metamorphosed to greenschist grade in Late Cretaceous time. These regionally metamorphosed rocks subsequently were locally remetamorphosed to hornblende hornfels near the contacts of Cretaceous granodiorite plutons that were emplaced after the regional metamorphism. The premetamorphic age of the strata is uncertain. Berg and others (1988) assign them a Mesozoic or (late) Paleozoic age. Berg (1982) and Crawford and others (in press) assign them to the Gravina belt, of Late Jurassic or Cretaceous age, or to the Taku terrane, of late Paleozoic to Late Triassic age. The metamorphic and intrusive rocks locally are overlain by basalt and andesite lava flows of Quaternary or Tertiary age.? the deposit consists of sulfide-bearing quartz fissure veins in intercalated metapelitic and metavolcanic (greenstone) schists near the contact of a granodiorite puton (Wright and Wright, 1908, p. 149). The sulfide minerals are pyrite, galena, and sphalerite, generally in small amounts. The largest vein reportedly is up to 60 feet wide; it strikes N15W and dips vertically, across the foliation of the schists.

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

References

Reference (Deposit): Wright, F.E., and Wright, C.W., 1908, The Ketchikan and Wrangell mining districts, Alaska: U.S. Geological Survey Bulletin 347, 210 p.

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