Exchange

Prospect in Alaska, United States with commodity Gold
Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Host and associated rocks
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10000283
MRDS ID A010327
Record type Site
Current site name Exchange

Geographic coordinates

Geographic coordinates: -132.53379, 56.42168 (WGS84)
Relative position Long known prospect near Wedge Point, northwest Woronkofski Island. Roehm (1945 [IR 195-37]) describes it as a large quartz lens parallel to the shoreline for about 300 feet and just back from it.

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Petersburg B-2 NW(quadrangle 1:24,000 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
Gold Primary

Materials information

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

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Granite

Nearby scientific data

(1) -132.53379, 56.42168

Economic information

Comments on the geologic information

  • Geologic Description = Quartz vein 12-15 feet thick in granite contains sparse pyrite and moderate values in gold. Opened by two adits and open cuts (Wright and Wright, 1908; Roehm, 1945 [IR 195-37]). Brew (1997 [OF 97-156-D]) has mapped the rocks in the vicinity as Cretaceous low- to medium-grade schist and semischist derived from Cretaceous-Jurassic Seymour Canal Formation sedimentary rocks. However, that mapping was more regional than detailed and descriptions of the deposit invariably show it as being in felsic plutonic rocks variously described as granite or syenite.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Active?

Mining district

District name Petersburg

Comments on the production information

  • Production Notes = No record of production.

Comments on the workings information

  • Workings / Exploration = The property was first staked in 1900 and developed by surface trenches and some underground workings that include a crosscut 45 feet long. Two of the claims were restaked in 1974, were active through at least 1982, and are probably still active in 1996.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Roehm, 1945 (IR 195-37)

General comments

Subject category Comment text
Deposit Model Name = Gold quartz vein

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-98 H.C. Berg U.S. Geological Survey
Reporter 01-NOV-98 D.J. Grybeck U.S. Geological Survey

Beyond USGS

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

Authoritative Alaska resources

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