Lost Lake

The Lost Lake is a zinc, lead, and barium-barite 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: Lost Lake

Commodity

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

Location

State: Alaska
District: Petersburg

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: Quartz pebble conglomerate Au-U (BC name is Paleoplacer U-Au-PGE-Sn-Ti

Orebody

Not available

Structure

Not available

Alterations

Alteration Text: The schists that host the massive sulfide layers are probably hydrothermally altered basalts (Newberry and Brew, 1997).

Rocks

Not available

Analytical Data

Not available

Materials

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

Comments

Comment (Geology): Age = Probably Triassic based on geochemistry of host rocks (Newberry and Brew, 1997), and the deposit's similarity to other deposits in the Triassic, Duncan Canal-Zarembo belt of massive sulfide deposits defined by Berg and Grybeck (1980) and Berg (1981).

Comment (Reference): Primary Reference = This description

Comment (Reserve-Resource): Reserves = This is probably Westmin's 'Lost Show' deposit on Woewodski Island that Westmin described in 1997 on the Internet at http://westmin-resources.com/explore.html as containing 'a geologic reserve of approximately 500,000 tonnes grading 8.1% zinc, 0.6% lead and 77.76 g/t silver'.

Comment (Geology): Geologic Description = A resistant layer of cream- to light-gray colored schist about 10 feet thick dams in the north side of the lake at the prospect. The foliation strikes about N80E to S75E, i.e., roughly parallel to the north side of the lake, and dips about 70-85 S. The schist contains at least two layers of massive sulfides 8 inches to 16 inches thick that consist mainly of sphalerite with moderate amounts of pyrite and sparse galena (unpublished field notes by D. Grybeck, 1996). Analyses of a number of samples of similar(?) schist sampled nearly by Newberry and Brew (1989) indicate that: 1) the schist is derived from basaltic protoliths and were probably subsequently altered, 2) the schist is geochemically analogous to samples from the Greens Creek mine on Admiralty Island; and 3) the deposit is probably Triassic in age.

Comment (Workings): Workings / Exploration = Found in late 1980's and explored or examined by a number of companies since; in 1996 held by Westmin Resources Limited, which has other properties on Woewodski Island. The massive sulfide layer is covered by only a thin layer of vegetation, and has been sampled by several shallow pits. Several drilling sites were obvious at the prospect in 1996 and at least 18 holes are said to have been drilled.

Comment (Deposit): Model Name = Barite facies of a Kuroko volcanogenic massive-sulfide model (Cox and Singer, 1986m, model 29a). Alternatively a barite facies of a volcanogenic Sierran Kuroko model (Bliss, 1992; model 28a1)

Comment (Production): Production Notes = None

Comment (Exploration): Status = Active

References

Reference (Deposit): Grybeck, D.J., and Berg, H.C., 1998, Alaska Resource Data File, Petersburg quadrangle: U. S. Geological Survey Open-File Report 98-784, 176 p.

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