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  3. Mineral Resource Data System (MRDS)

Unnamed (on western edge of McBride Glacier)

Occurrence in Alaska, United States with commodities Gold, Copper, Silver, Molybdenum, 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. Alteration
  8. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10002220
MRDS ID A013122
Record type Site
Current site name Unnamed (on western edge of McBride Glacier)
Related records 10186001

Geographic coordinates

Geographic coordinates: -136.07211, 59.08974 (WGS84)
Relative position This occurrence is in the Glacier Bay National Park and Preserve on the western edge of the McBride Glacier at an elevation of approximately 2000 feet. (Note: the text in Brew and others (1978) notes this occurrence at an elevation of 2500 feet, but they plotted it where the 2,000-foot contour line intersects the western edge of the McBride Glacier) It is near the center of section 13, T. 32 S., R. 55 E. of the Copper River Meridian. The approximate location is shown as number 7 in Cobb (1972 [MF 424]) and is more accurately located as number 77 on Plate III of Brew and others (1978).

Site location context

Political divisions (FIPS codes)

Hoonah-Angoon(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Skagway A-3(quadrangle 1:63,360 scale)

Skagway SE(quadrangle 1:100,000 scale)

Skagway C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Glacier Bay(hydrologic unit)

Northern Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Glacier Bay National Park(National Park)

National Park NPS(Type of land area)

NPS(Federal land areas administered by NPS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Copper Primary
Silver Secondary
Molybdenum Secondary
Zinc Critical Secondary

Materials information

Materials Type of material
Arsenopyrite Ore
Chalcopyrite Ore
Pyrite Ore
Pyrrhotite Ore

Alteration

  • (Local) Copper, Iron Staining

Mineral occurrence model information

Model code 59
USGS model code 18b
Deposit model name Skarn Cu
Mark3 model number 8
Model code 72
USGS model code 19a
Deposit model name Polymetallic replacement
Mark3 model number 47

Host and associated rocks

  • Host or associated Host
    Rock type
    Stratigraphic age (youngest) Permian

Nearby scientific data

(1) -136.07211, 59.08974
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The following description is summarized from Brew and others (1978).?Arsenopyrite, chalcopyrite, pyrite, pyrrhotite, and traces of gold occur in ankeritic zones near an irregular, interfingered contact that marks a facies change between marble and phyllite. About 10 separate zones are present, each less than 10 feet wide and less than 100 feet long. The zones are copper and iron stained and are conformable to the bedding of the metasediments. One zone forms the hanging wall of 5-foot-wide andesite dike that contains chalcopyrite and pyrite. A 2-foot channel sample across an iron-stained zone in marble contained 0.003 ounce of gold per ton, 13,000 ppm copper, 200 ppm zinc, 15 ppm silver, 7,000 ppm arsenic, 5 ppm molybdenum, and more than 5,000 ppm manganese. Four other samples contained lesser amounts of metals. MacKevett (1971) reported a grab sample of sulfide-bearing rock that contained 0.088 ounce of gold per ton. The metasediments that host the deposit are Permian and Permian(?) in age which establishes a maximum age for the mineralization. Granitic intrusives in the general area are Cretaceous to Tertiary in age (Brew and others, 1978).
  • Age = Unknown. The Permian and Permian age of the metasedimentary host rocks establishes a maximum age, but the mineralization may be related to nearby Cretaceous or Tertiary granitic intrusives(Brew and others, 1978).
  • Age = Host rock is Permian.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Juneau (Glacier Bay subdistrict)

Comments on the workings information

  • Workings / Exploration = Only sampling of outcrops.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Brew and others, 1978

General comments

Subject category Comment text
Deposit Model Name = This is only an occurrence with little available information . Based on the descriptions by Brew and others (1978) it appears to be a skarn or replacement occurrence (Cox and Singer, 1986; models 18b? or 19a?).
Deposit Model Number = 18b?, 19a?
Deposit Other Comments = the occurrence is within Glacier Bay National Park and Preserve where mining and prospecting are restricted.

Reporter information

Type Date Name Affiliation Comment
Reporter 04-FEB-2001 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.