Unnamed (South Marble Island)

The Unnamed (South Marble Island) is a titanium, iron, and copper mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Unnamed (South Marble Island)

Commodity

Primary: Titanium
Primary: Iron
Primary: Copper

Location

State: Alaska
District: Juneau

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Marble is locally silicified.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pyrite
Ore: Chalcopyrite
Gangue: Quartz

Comments

Comment (Deposit): Other Comments = the site is in Glacier Bay National Park and Preserve.

Comment (Workings): 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).

Comment (Geology): 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).

Comment (Exploration): Status = Probably inactive

Comment (Geology): Age = Cretaceous or younger.

Comment (Reference): Primary Reference = Reed, 1938

References

Reference (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.

Reference (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.

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Mount Fairweather quadrangle, AK: U.S. Geological Survey Miscellaneous Field Study Map MF-436, 1 sheet, scale 1:250,000.

Reference (Deposit): Reed, J.C., 1938, Some mineral deposits of Glacier Bay and vicinity, Alaska: Economic Geology, v. 33, p. 52-80.

Reference (Deposit): Burchard, E.F., 1914, Marble resources of the Juneau, Skagway, and Sitka districts, Alaska: U.S. Geological Survey Bulletin 592-C, p. 95-107.

Reference (Deposit): Burchard, E.F., 1920, Marble resources of southeastern Alaska: U.S. Geological Survey Bulletin 682, 118 p.

Reference (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.

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