1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Unnamed (near Round Point)

Prospect 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. Mineral occurrence model information
  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 10308065
Record type Site
Current site name Unnamed (near Round Point)

Geographic coordinates

Geographic coordinates: -132.70485, 56.27974 (WGS84)
Relative position As originally reported by Grybeck, Berg, and Karl (1984), this site is based on a short examination by the reporters and an industry geologist who was working from a small camp nearby. The specific site that was visited was an exposure in a small creek bed in about the center of section 36, T. 64 S., R. 81 E., but mineralized outcrops were reported to be more extensive in the vicinity.

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

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore
Sphalerite Ore

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

Nearby scientific data

(1) -132.70485, 56.27974
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The mineralized exposure consists of rusty-weathering, light green-gray felsic metavolcanic rocks with small lenses, pods, and layers up to a foot thick that contain disseminated sulfides, mainly pyrite and possibly sphalerite and chalcopyrite. Analyses of grab samples show less than 5 ppm Cu, 50-150 ppm Pb, 200-11,000 Zn, and 150-5,000 Ba. The felsic metavolcanic rocks are interbedded with light gray, silicified limestone and dark gray argillite. Recent geologic mapping in the area (S. Karl, oral communication, 1998) indicates that the rocks in which the sulfides occurs are probably part of the Triassic Hyd Group. The site marked the southern end of the Duncan Canal-Zarembo belt of Triassic volcanogenic massive-sulfide mineralization as originally defined by Berg and Grybeck in 1980.
  • Age = Probably Triassic.

Economic information about the deposit and operations

Development status Prospect

Mining district

District name Ketchikan

Comments on the production information

  • Production Notes = None

Comments on the reserve resource information

  • Reserves = None

Comments on the workings information

  • Workings / Exploration = Site was originally defined in 1984 by Grybeck, Berg, and Karl on the basis of a brief visit to an industry exploration camp nearby. However, exploration was more widespread than just the occurrence that the USGS visited and there may have been some drilling on the property. However, there is little indication that major surface exploration continued in this area much beyond the mid-80's, although the area may well have been further examined by industry since.

Reference information

Bibliographic references

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-98 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.