Hopalong

The Hopalong 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: Hopalong

Commodity

Primary: Gold

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: Past Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Low-sulfide Au-quartz vein

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pyrite
Ore: Arsenopyrite
Ore: Gold
Gangue: Calcite
Gangue: Muscovite
Gangue: Quartz

Comments

Comment (Geology): Age = Late Cretaceous or younger.

Comment (Production): Production Notes = Minor production of gold from ground sluicing weathered outcrops.

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

Comment (Workings): Workings / Exploration = Surface sluicing of weathered veins produced some free gold (Rossman, B 1058-B, p. 56). The Hopalong claims were staked by Joe Ibach in 1943 (Kimball and others, 1978, p. C236).

Comment (Geology): Geologic Description = The Hopalong mine is in diorite or quartz diorite of Cretaceous age that contains inliers and irregular masses of hornfels of Paleozoic age (Brew and others, 1978). The granitic rocks are cut by north-striking nearly vertical veins, as much as 1 foot thick, that pinch and swell. Individual veins can be traced for 60 feet and contain quartz, abundant calcite, minor muscovite, pyrite and arsenopyrite.? Surface parts of some of the veins, possibly enriched by surface leaching, contained native gold.

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

Comment (Deposit): Model Name = Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).

Comment (Exploration): Status = Inactive

Comment (Commodity): Ore Material = Gold (native)

References

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): 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): 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): 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): 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.

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