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Lost Zarembo

Occurrence in Alaska, United States with commodities Copper, Lead, Zinc
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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. Host and associated rocks
  10. Nearby scientific data
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10000275
MRDS ID A010318
Record type Site
Current site name Lost Zarembo

Geographic coordinates

Geographic coordinates: -132.90075, 56.38085 (WGS84)
Relative position Location of occurrence is known exactly in NE1/4, section 27, T. 63 S., R. 80 E., at an elevation of about 600 feet. Occurrence is well exposed on the north wall of a rock quarry adjacent to a logging road. In 1996, the quarry was largely grown up in vegetation but the mineral occurrence was still nicely exposed behind the trees.

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 B-3(quadrangle 1:63,360 scale)

Petersburg S(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
Copper Primary
Lead Primary
Zinc Critical Primary

Comments on the commodity information

  • Gangue = Silica matrix.

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Pyrite Ore
Sphalerite Ore

Alteration

  • (Local) Outcrop is iron-stained, probably from weathering of sulfides.

Mineral occurrence model information

Model code 184
USGS model code 28a
Deposit model name Massive sulfide, kuroko
Mark3 model number 93
Model code 187
USGS model code 28a.1
Deposit model name Massive sulfide, Sierran kuroko
Mark3 model number 44

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite

Nearby scientific data

(1) -132.90075, 56.38085
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The deposit as described by Grybeck, Berg, and Karl (1984) consists of three, massive sulfide layers in orange-weathering, greenish-gray metarhyolite along the west wall of the quarry. The most prominent exposure of the sulfides is a 4-foot-thick layer that crops out for about 50 feet and is truncated at both ends by faults. Selected portions of the massive sulfide layers contain up to 30% sulfides, mainly sphalerite, accompanied by minor pyrite, chalcopyrite, and galena, in a fine-grained siliceous matrix. Analyses of selected grab samples contain up to 0.55 ppm Au, about 8% Zn, 0.25% Pb, 0.39% Cu, 30 ppm or less Ag, and up to 5000 ppm Ba. The occurrence forms a wedge-shaped, fault-bounded outcrop about 30 by 100 feet in size in size that abuts steeply-dipping Tertiary basalt, diabase, and rhyolite dikes. As now exposed, the massive sulfide deposit is not very large and the quarry is dominated by the various steeply dipping Tertiary dikes. The association of massive sulfides interbedded with metarhyolite suggests that this occurrence is part of the Duncan Canal-Zarembo belt of dismembered, Upper Triassic volcanogenic massive sulfide deposits described by Berg and Grybeck (1980) and Berg (1981).
  • Age = Probably a segment of the dismembered, Upper Triassic Duncan-Zarembo volcanogenic mineral belt defined by Berg and Grybeck (1980) and Berg (1981).

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Petersburg

Comments on the production information

  • Production Notes = None

Comments on the workings information

  • Workings / Exploration = Originally found by the USGS in the late 70's. Revisited by the USGS in 1996 (D.J. Grybeck); little had changed except for signs that others had collected samples there.

Reference information

Bibliographic references

  • Deposit

    Berg, H. C., and Grybeck, Donald, 1980, Upper Triassic volcanogenic Zn-Pb-Ag (-Cu-Au) mineral deposits near Petersburg, Alaska: U.S. Geological Survey Open-File Report 80-527, 11 p., 1 oversize sheet.

  • Deposit

    Berg, H.C., 1981, Upper Triassic volcanogenic massive sulfide metallogenic province identified in southeastern Alaska, in Albert, N.R.D., and Hudson, T.L., eds., The United States Geological Survey in Alaska: accomplishments during 1979: U.S. Geological Survey Circular 823-B, p. B104-B108.

  • Deposit

    Grybeck, D.J., Berg, H.C., and Karl, S.M., 1984, Map and description of the mineral deposits in the Petersburg and eastern Port Alexander quadrangles: U.S. Geological Survey Open-File Report 84-837, 86 p., 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Grybeck, Berg, and Karl, 1984

General comments

Subject category Comment text
Deposit Model Name = Kuroko volcanogenic massive-sulfide deposit (Cox and Singer, 1986; model 28a); alternatively a Sierran Kuroko volcanogenic massive sulfide deposit (Bliss, 1992; model 28a1)

Reporter information

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