Unnamed (area near Fall Creek, Mudside Creek, Coal Creek, and upper Topsy Creek)

The Unnamed (area near Fall Creek, Mudside Creek, Coal Creek, and upper Topsy Creek) is a gold 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 (area near Fall Creek, Mudside Creek, Coal Creek, and upper Topsy Creek)

Commodity

Primary: Gold
Secondary: Molybdenum
Secondary: Tungsten
Secondary: Silver

Location

State: Alaska
District: Yakutat

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
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: Solfataric (?) hydrothermal alteration.

Rocks

Name: Sandstone
Role: Host
Age Type: Associated Rock Unit
Age Young: Late Cretaceous

Analytical Data

Not available

Materials

Ore: Powellite
Ore: Pyrite

Comments

Comment (Exploration): Status = Inactive

Comment (Reference): Primary Reference = Rossman, 1959 (B 1058-B)

Comment (Workings): Workings / Exploration = Hydrothermal zones were first observed by D.J. Miller of the U.S. Geological Survey in mapping of the Lituya area (Miller, 1953); the mapping was followed up by sampling in 1954 (Rossman, 1959). In addition to the location in Fall Creek that assayed 0.24 ounce per ton gold and 0.06 ounce per ton silver, Rossman found 0.06 ounce per ton gold about 0.5 mile upstream in Fall Creek and at another location in the north fork of Fall Creek. Miller reported addtional hydrothermal zones in upper Topsy Creek about 1 mile to the SE; these occurrences are in rocks of Mesozoic age and were shown by Rossman in his report (fig. 9).? In later follow up, the U.S. Bureau of Mines detected silver in one sample in upper Fall Creek; the sample contained fine disseminated pyrite and a trace of powellite in jasperoid in greenstone (Kimball and others, 1978, p. 94).

Comment (Deposit): Model Name = Epithermal (?) low-sulfide gold deposit.

Comment (Deposit): Other Comments = the Tertiary and Mesozoic country rocks of the hydrothermal zones are in the Lituya terrane of Brew and others (1978). The sites are in Glacier Bay National Park and Preserve.

Comment (Geology): Geologic Description = Red- and yellow-stained hydrothermally altered zones as much as one-half mile long occur in sedimentary and volcanic rocks of Tertiary and Mesozoic age southeast of Lituya Bay (Brew and others, 1978). The zones, which are rich in clay, possibly are the result of alteration by thermal springs localized by faults. The faults subsequently localized Fall Creek and other drainages. ? Rossman (1959) found a maximum of 0.24 ounce per ton gold in one sample from the zone in Fall Creek. The Bureau of Mines found 0.02 ounce per ton silver in a jasper-rich zone in greenstone in upper Fall Creek. The rock contained fine disseminated pyrite and a trace of powellite (Kimball and others, 1978, p. C94).

Comment (Geology): Age = Tertiary.

References

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): 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.

Reference (Deposit): Rossman, Darwin, 1959, Geology and ore deposits in the Reid Inlet area, Glacier Bay, Alaska: U.S. Geological Survey Bulletin 1058-B, p. 33-58.

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): Miller, D. J., 1953, Preliminary geologic map of Tertiary rocks in the southeastern part of the Lituya district, Alaska: U.S. Geological Survey Open-file Report 81, 2 maps, scale 1:63,360.

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): Cobb, E. H., 1981, Summaries of data and lists of references to metallic and selected non-metallic mineral occurrences in the Mt. Fairweather quadrangle, Alaska, Supplement to Open-file Report 78-316: U. S. Geological Survey Open-File Report 81-249B, 15 p.

Reference (Deposit): Cobb, E.H., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Mt. Fairweather quadrangle, Alaska; Supplement to Open-file Report 78-316; Part A, Summaries of data to January 1, 1980: U.S. Geological Survey Open-File Report 81-249-A, 20 p.

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