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

Unnamed (South Marble Island)

Prospect in Alaska, United States with commodities Copper, 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 10307816
Record type Site
Current site name Unnamed (South Marble Island)

Geographic coordinates

Geographic coordinates: -136.04408, 58.64273 (WGS84)
Relative position The site is on South Marble Island in Glacier Bay. Its location is approximate, but probably correct within 0.1 mile. It is location number 51 of Cobb (1972) and number 25 of MacKevett and others (1978).

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Mount Fairweather C-1 NE(quadrangle 1:24,000 scale)

Juneau NW(quadrangle 1:100,000 scale)

Mount Fairweather(quadrangle 1:250,000 scale)

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
Copper Primary
Iron Primary
Titanium Critical Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore
Quartz Gangue

Alteration

  • (Local) Marble is locally silicified.

Nearby scientific data

(1) -136.04408, 58.64273
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The site is within the marble-rich province of Devonian and Silurian age that extends northwesterly from Willoughby Island to Queen Inlet (MacKevett and others, 1971; Brew and others, 1978). Bathymetric contours near South and North Marble Island indicate a barely submerged mass, inferred to be mostly marble, that is also aligned northwest. The exposures on the two small islands are the surface expressions of the inferred marble mass. The island was investigated as a marble prospect Burchard (1914 and 1920). The marble on South Marble island is locally cut by mafic dikes as much as 50 feet across that contain disseminated pyrite; pyrite also occurs in silicified marble near the dike rocks. Reed (1938) reported copper sulfide (chalcopyrite) occurrences. of four pyritic samples collected by the U.S. Geological Survey, three contained more than 10 percent iron and one contained about 7 percent iron; titanium content ranged from 0.5 to 1 percent in the same samples (MacKevett and others, 1971, table 9). The sulfide deposits and silicification probably are related to the emplacement of the mafic dikes, possibly in Cretaceous or Tertiary time (Brew and others, 1978).
  • Age = Cretaceous or younger.

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Probably inactive

Mining district

District name Juneau

Comments on the workings information

  • Workings / Exploration = No workings. MacKevett and others (1971) reported iron content as greater than 10 percent in three of four selected samples of marble and dike material. Maximum titanium content is 1 percent. All four samples contained 100 ppm nickel, and ranged from 150-200 ppm copper. It is doubtful if any of the samples reported by MacKevett and others represent the copper sulfide-bearing material seen by Reed (1938).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Reed, 1938

General comments

Subject category Comment text
Deposit Other Comments = the site is in Glacier Bay National Park and Preserve.

Reporter information

Type Date Name Affiliation Comment
Reporter 03-JAN-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.