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Berg Basin

Prospect in Alaska, United States with commodities Silver, Gold, Lead, Zinc, Copper
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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. Mineral occurrence model information
  8. Host and associated rocks
  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 10093934
MRDS ID A010328
Record type Site
Current site name Berg Basin
Related records 10283139

Geographic coordinates

Geographic coordinates: -132.01183, 56.44586 (WGS84)
Relative position A well documented, seemingly well-defined site at an elevation of about 1800 feet on a unnamed south-flowing tributary to the north end of Berg Creek. However, an extended ground and air search for the prospect by D. J. Grybeck of the USGS and Jan Still of BLM in 1996 failed to find it. Possibly now covered by an avalanche or hidden in the thick vegetation. Coordinates are based on older references and apparently are accurate to within several hundred meters; probably somewhere in the SW1/4, section 33, T. 63 S., R. 83 E.

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-1(quadrangle 1:63,360 scale)

Petersburg S(quadrangle 1:100,000 scale)

Petersburg(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Southern 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
Silver Primary
Gold Primary
Lead Primary
Zinc Critical Primary
Copper Secondary

Comments on the commodity information

  • Ore Material = Gold (native)

Materials information

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

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt

Nearby scientific data

(1) -132.01183, 56.44586
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rocks in the area of this prospect are biotite schist and subordinate marble and calcsilicate rocks that are intruded by Eocene tonalite and granodiorite and by younger dikes and sills of rhyolite, basalt, and pegmatite (Brew and others, 1984). ? the deposit consists of a stockwork of quartz veinlets carrying pyrite, galena, and sphalerite, and of sporadic small masses of sphalerite and galena (Gault and others, 1953). Some of the veins contain moderate values of gold and silver. The small sulfide masses occur in a composite basaltic dike, in thin breccia zones along the contacts of basalt and rhyolite dikes and sills, along contacts of basalt dikes with schist near rhyolite, and disseminated in the rhyolite. One diamond drill hole intersected 5 feet of solid and disseminated galena. No galena or sphalerite have been found except where basaltic dikes are associated with rhyolite sills and dikes. The galena contains up to 28 ounces of silver per ton. A quartz vein reported to carry about 0.68 ounces of gold per ton crops out at the surface but could not be found in the underground workings. ? the Berg Basin prospect is along the southern extension of the belt that includes the deposits in Glacier Basin (PE041) and Groundhog Basin (PE040) to the north.
  • Age = The age of the deposit is inferred to be mid-Cenozoic, based on its spatial and apparently genetic association with dikes and sills that cut the Eocene tonalite.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Mining district

District name Petersburg

Comments on the production information

  • Production Notes = Probably none

Comments on the reserve resource information

  • Reserves = None

Comments on the workings information

  • Workings / Exploration = Discovered in 1907. Explored by several surface pits, a tunnel about 800 feet long, and several hundred feet of diamond drilling in 1947-1948. Fowler (1950) indicates that seven men were working at the property then but apparently there has been no work since.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Gault and others, 1953

General comments

Subject category Comment text
Deposit Model Name = Polymetallic veins? (Cox and Singer, 1986; model 22c)

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.