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

Unnamed (near LeBlondeau Glacier)

Occurrence in Alaska, United States with commodities Silver, Copper, Zinc, Gold
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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. 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 10308240
Record type Site
Current site name Unnamed (near LeBlondeau Glacier)

Geographic coordinates

Geographic coordinates: -136.24212, 59.22974 (WGS84)
Relative position This occurrence is at an elevation of about 4,500 feet about 0.5 miles west of the LeBlondeau Glacier and about 0.8 mile northeast of the boundary of Glacier Bay National Park and Preserve. It is in the approximate center of a group of six locations sampled by Gilbert (1988) in the south-central part of section 25, T. 30 S., R. 54 E. of the Copper River Meridian.

Site location context

Political divisions (FIPS codes)

Haines(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Skagway A-4(quadrangle 1:63,360 scale)

Skagway SE(quadrangle 1:100,000 scale)

Skagway C(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
Zinc Critical Primary
Gold Secondary

Materials information

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

Alteration

  • (Local) Skarn.

Mineral occurrence model information

Model code 59
USGS model code 18b
Deposit model name Skarn Cu
Mark3 model number 8

Nearby scientific data

(1) -136.24212, 59.22974
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Gilbert (1988) and Still and others (1991 [BOM, v. 2, Sec. A]) describe this occurrence as, 'a magnetite-chalcopyrite skarn that crops out near a diorite-marble contact.' They note that the skarn contains magnetite lenses up to 10 feet across, with associated grossularite garnet, epidote, and marble. Nearly all of 17 rock samples collected in this area contained substantially elevated levels of copper, silver, and zinc. Values were as high as 8,540 ppm copper, 10.8 ppm silver, 11,500 ppm zinc, 620 ppm cobalt, and 0.17 ppm gold. Brief descriptions of the rock samples refer to chalcopyrite, pyrite, pyrrhotite, and magnetite in association with iron-stained diorite and skarn. The mineralization is probably the same age as the Cretaceous diorite (Gilbert, 1988).
  • Age = Probably Cretaceous based on the age of the associated diorite (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 = Still and others, 1991

General comments

Subject category Comment text
Deposit Model Name = Copper skarn (Cox and Singer, 1986; model 18b).

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.