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

Unnamed (between Curtis Hills and Bruce Hills)

Occurrence in Alaska, United States with commodities Silver, Copper, Lead, Chromium, Iron, Titanium
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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 10307820
Record type Site
Current site name Unnamed (between Curtis Hills and Bruce Hills)

Geographic coordinates

Geographic coordinates: -136.2521, 58.95973 (WGS84)
Relative position Poorly-defined northwest-trending area between the Curtis Hills and Bruce Hills. It is north of Plateau Glacier and south of Burroughs Glacier. The area is approximately 2 to 3 miles long and 1 mile wide. The coordinates are for the approximate midpoint of the area. The site is location number 73 of Kimball and others (1978) and number 23 of MacKevett and others (1971).

Site location context

Political divisions (FIPS codes)

Hoonah-Angoon(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Mount Fairweather D-1(quadrangle 1:63,360 scale)

Juneau NW(quadrangle 1:100,000 scale)

Mount Fairweather(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
Silver Primary
Copper Primary
Lead Primary
Chromium Critical Secondary
Iron Secondary
Titanium Critical Secondary

Materials information

Materials Type of material
Ankerite Gangue
Calcite Gangue
Quartz Gangue

Alteration

  • (Local) Propylitic (?).

Nearby scientific data

(1) -136.2521, 58.95973
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Economic information

Comments on the geologic information

  • Geologic Description = The area is underlain by schist, hornfels, and marble derived mainly from sedimentary rocks of Paleozoic age. The sedimentary rocks were metamorphosed by the intrusion of a granitic batholith of Cretaceous age (Brew and others, 1978). The metasedimentary rocks are cut by mafic dikes and lie between the granitic Curtis and Bruce Hills. The area has recently been denuded by melting of the Plateau and Burroughs Glaciers. . The mineral occurrences of the area are mainly low-sulfide quartz-calcite-ankerite veins that formed on the contacts of mafic dikes that cut the metasedimentary rodk. Grab samples of various occurrences contained as much as 300 ppm lead, 700 ppm copper, and 15 ppm silver (MacKevett and others, 1971, location 23, table 9; Kimball and others, 1978, location 73, p. C316-317). Other elements, including chromium, iron, and titanium, are locally geochemically anomalous in the veins; these elements possibly were contained in or contributed to the veins by the mafic dikes. Titanium content exceeded 1 percent in one sample and was 1 percent in several others. Veins of the area could be distal structures to a buried contact zone between granite and the metasedimentary rocks.
  • Age = Cretaceous or younger.

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Juneau

Comments on the workings information

  • Workings / Exploration = No workings. MacKevett and others (1971, location 23) found as much as 700 ppm copper and chromium and 1 percent titanium in iron-stained vein zones along mafic dikes. Kimball and others (1978, p. C316-317) reported 300 ppm lead and 15 ppm silver in a 0.3 foot thick quartz-calcite vein and more than 1 percent titanium in one wider (5 ft.) chip sample.

Reference information

Bibliographic references

  • Deposit

    MacKevett, E.M., Jr., Brew, D.A., Hawley, C.C., Huff, L.C., and Smith, J.G., 1971, Mineral resources of Glacier Bay National Monument, Alaska: U.S. Geological Survey Professional Paper 632, 90 p., 12 plates, scale 1:250,000.

  • Deposit

    Brew, D.A., Johnson, B.R., Grybeck, D., Griscom, A., Barnes, D.F., Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources of the Glacier Bay National Monument Wilderness Study Area, Alaska: U.S. Geological Survey Open-File Report 78-494, 670 p.

  • Deposit

    Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources, in Brew, D. A., and others, Mineral resources of the Glacier Bay National Monument wilderness study area, Alaska: U.S. Geological Survey Open-File Report 78-494, p. C1-C375.

Comments on the references

  • Primary Reference = Kimball and others, 1978

General comments

Subject category Comment text
Deposit Model Name = Distal low-sulfide quartz-carbonate veins: Possible trace element contribution from mafic dike hosts.
Deposit Other Comments = the vein deposits are typical distal quartz-carbonate veins locally enriched in lead, copper, and silver. Prospecting closer to the granitic intrusives of the Bruce and Curtis Hills might find richer vein deposits, possibly transitional into copper and copper-molybdenum-bearing deposits.. The site is in Glacier Bay National Park and Preserve.

Reporter information

Type Date Name Affiliation Comment
Reporter 15-APR-99 Hawley, C.C. Hawley Resource Group

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.