Nimbus

The Nimbus is a gold and silver 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: Nimbus
Secondary: Camp Creek

Commodity

Primary: Gold
Primary: Silver
Secondary: Antimony
Secondary: Copper
Secondary: Arsenic
Secondary: Zinc

Location

State: Alaska
District: Valdez Creek

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

Model Name: Polymetallic veins

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Phyllic.

Rocks

Role: Associated
Age Type: Associated Rock
Age in Years: 67.500000+-2.500000
Age Young: Late Cretaceous

Analytical Data

Not available

Materials

Ore: Arsenopyrite
Ore: Chalcopyrite
Ore: Pyrite
Ore: Sphalerite
Ore: Stibnite
Gangue: Quartz

Comments

Comment (Geology): Age = Chron age is for the Golden Zone mine.

Comment (Geology): Age = The similarity of the Nimbus deposit to the Upper Cretaceous (70-65 Ma) Golden Zone deposit (HE043) suggests that they are probably the same age.

Comment (Geology): Geologic Description = The country rock at this prospect consists of Upper Jurassic to Upper Triassic(?) crystal tuff, argillite, chert, graywacke, and limestone that are intruded by Upper Cretaceous quartz diorite dikes. The deposit is in brecciated dikes and consists of lenses 1 to 2 meters thick, and up to 10 meters long, of massive chalcopyrite, arsenopyrite, stibnite, pyrite, and sphalerite. The deposit is similar in mineralogy and type to the Golden Zone deposit (HE043) and satellite prospects to the southwest. Samples from arsenopyrite-rich veins contained a maximum 9.3 ppm Au and 22 ppm Ag over a width of 2.0 feet (Hawley and others, 1978).

Comment (Reference): Primary Reference = Hawley and others, 1978

Comment (Workings): Workings / Exploration = There has been surface exploration. Samples from arsenopyrite-rich veins contained a maximum 9.3 ppm Au and 22 ppm Ag over a width of 2.0 feet (Hawley and others, 1978).

Comment (Exploration): Status = Active

Comment (Deposit): Model Name = Polymetallic vein (Cox and Singer, 1986; model 22c)

Comment (Deposit): Other Comments = Some references combine this prospect with the similar Nimrod prospect (HE076) as one site.

References

Reference (Deposit): Nokleberg, W.J., and others, 1994, Metallogeny and major mineral deposits of Alaska and Metallogenic map of significant metalliferous lode deposits and placer districts of Alaska, in Plafker, G. and Berg, H.C., eds., The Geology of Alaska: Boulder, Colorado, Geological Society of America: The Geology of North America, v. G1, p. 855-904 and v. G1, Plate 11, scale 1:2,500,000.

Reference (Deposit): Hawley, C.C., Clark, A.L., Herdrick, M.A., and Clark, S.H.B., 1969, Results of geological and geochemical investigations in an area northwest of the Chulitna River, central Alaska Range: U.S. Geological Survey Circular 617, 19 p.

Reference (Deposit): Hawley, C.C., and others, 1978, Mineral appraisal of lands adjacent to Mt. McKinley National Park, Alaska. Contract No. JO166107: U.S. Bureau of Mines Open-File Report 24-78, 274 p., 12 sheets.

Reference (Deposit): Bundtzen, T.K., 1983, Mineral resource modeling, Kantishna and Dunkle mine study areas: Alaska Division of Geological "&" Geophysical Surveys Report of Investigations 83-12, 51 p.

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