1. Mineral Resources
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  3. Mineral Resource Data System (MRDS)

Unnamed (north of Rainbow Glacier)

Occurrence in Alaska, United States with commodities Silver, Copper, Barium-Barite, Cobalt
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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. 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 10308238
Record type Site
Current site name Unnamed (north of Rainbow Glacier)

Geographic coordinates

Geographic coordinates: -135.58209, 59.13975 (WGS84)
Relative position This occurrence is at an elevation of about 3,300 feet, 1.3 miles S44W from survey marker 'Bow' on the west shore of Chilkat Inlet. It is in the SW1/4, section 33, T. 31 S., R. 59 E. of the Copper River Meridian. It corresponds to location 93 in Gilbert (1988) which is the approximate center of a group of sample locations with anomalously high metal values.

Site location context

Political divisions (FIPS codes)

Haines(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Skagway A-2(quadrangle 1:63,360 scale)

Skagway SE(quadrangle 1:100,000 scale)

Skagway(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Chilkat-Skagway Rivers(hydrologic unit)

Northern Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Copper Primary
Barium-Barite Critical Secondary
Cobalt Critical Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore
Pyrrhotite Ore
Quartz Gangue

Alteration

  • (Local) Silicification?

Nearby scientific data

(1) -135.58209, 59.13975
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Gilbert (1988) describes numerous samples within an area of about 1/2 mile in diameter as being quartz schist, felsic schist, or silicified rock with varying amounts of pyrrhotite, pyrite, and some chalcopyrite. Sample values are as high as 6.3 ppm silver, 1,300 ppm copper, 215 ppm cobalt, and 1,600 ppm barium. The host rocks are mapped by Gilbert (1988) as Paleozoic volcanics. His descriptions of felsic schist and quartz schist suggest a Paleozoic age for the mineralization if the rocks are volcanic. Alternatively, the felsic and quartz schists may be due to silicification and/or alteration related to nearby Cretaceous granodiorite intrusives.
  • Age = Unknown. If the felsic schist that hosts the deposit is volcanic, then the mineralization is probably Paleozoic. If the felsic schists are alteration zones peripheral to an intrusive, then the mineralization is probably related to the nearby Cretaceous intrusive rocks (Gilbert, 1988).

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Probably inactive

Mining district

District name Juneau (Skagway subdistrict)

Reference information

Comments on the references

  • Primary Reference = Gilbert, 1988

General comments

Subject category Comment text
Deposit Model Name = Unknown. Felsic schists are suggestive of a possible volcanogenic massive sulfide or, perhaps, an alteration zone peripheral to an intrusive.

Reporter information

Type Date Name Affiliation Comment
Reporter 04-FEB-01 T.C. Crafford T. Crafford & Associates

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.