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Lost Lake

Prospect in Alaska, United States with commodities Barium-Barite, Lead, Zinc, Silver, Gold
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Mineral occurrence model information
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10308682
Record type Site
Current site name Lost Lake

Geographic coordinates

Geographic coordinates: -133.05987, 56.57274 (WGS84)
Relative position Known to within 100 yards and easily located. The deposit is on the north bank of the small lake, locally named 'Lost Lake' on northwestern Woewodski Island (lake '175' on the USGS 1:63,360-scale topographic map). The deposit is about 25 feet north of the lake; it extends extends east and west of a small creek that flows to the north from about the center of the lake. Drilling pads and landing sites were still visible in 1996 at the prospect.

Site location context

Political divisions (FIPS codes)

Wade Hampton(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Petersburg C-4(quadrangle 1:63,360 scale)

Petersburg N(quadrangle 1:100,000 scale)

Petersburg(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Central Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Tongass National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Barium-Barite Critical Primary
Lead Primary
Zinc Critical Primary
Silver Secondary
Gold Secondary

Materials information

Materials Type of material
Galena Ore
Pyrite Ore
Sphalerite Ore
Quartz Gangue

Alteration

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

Mineral occurrence model information

Model code 193
USGS model code 29a
Deposit model name Quartz pebble conglomerate Au-U (BC name is Paleoplacer U-Au-PGE-Sn-Ti

Nearby scientific data

(1) -133.05987, 56.57274
ListMap

Economic information

Comments on the geologic information

  • 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.
  • 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).

Economic information about the deposit and operations

Development status Prospect
Commodity type Both

Comments on exploration

  • Status = Active

Mining district

District name Petersburg

Comments on the production information

  • Production Notes = None

Comments on the reserve resource information

  • 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'.

Comments on the workings information

  • 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.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = This description

General comments

Subject category Comment text
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)

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-1998 H.C. Berg and D.J. Grybeck U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.