Nation Gossan

The Nation Gossan is a zinc and lead 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: Nation Gossan

Commodity

Primary: Zinc
Primary: Lead
Secondary: Silver

Location

State: Alaska
District: Black

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: Mississippi Valley, Appalachian Zn

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: The Nation Gossan prospect consists of a zone of intense oxidation of pyrite along a high-angle fault zone. The center of the gossan shows pervasive silicification and chalcedonic stockwork veining (DiMarchi and others, 1993).

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Sphalerite
Ore: Pyrite
Ore: Galena

Comments

Comment (Deposit): Other Comments = This property lies on Doyon, Limited selected or conveyed land. For more information, contact Doyon, Limited. This site is within the Yukon-Charley Rivers National Preserve.

Comment (Exploration): Status = Active

Comment (Workings): Workings / Exploration = The Nation Gossan prospect was discovered by WGM Inc. in 1975, whose rock samples contained high lead and zinc values. In 1977, WGM Inc. ran some ground-EM traverses, but concluded that there were no significant conductors on the property. In 1993, additional soil and rock samples were collected and analyzed by ASA Inc (DiMarchi and others, 1993). This property lies on Doyon, Limited selected or conveyed land.

Comment (Reference): Primary Reference = DiMarchi and others, 1993

Comment (Deposit): Model Name = Carbonate-hosted Zn-Pb (Schmidt, 1997; Cox and Singer, 1986; model 32b).

Comment (Geology): Geologic Description = The Nation Gossan prospects consist of an oxidized fault breccia striking N20E within Upper Proterozoic dolomite and limestone of the Tindir Group (DiMarchi and others, 1993). The zone of brecciation and alteration is about 50 feet wide and three-quarters of a mile long. The gossan is best exposed in the saddle located in NE1/4 section 1, T 5 N., R. 32 E., of the Fairbanks Meridian. The gossan at this site consists of a dolomite breccia with apparent symmetrical zoning. The core of the gossan is characterized by pervasive silicification and abundant chalcedonic stockwork veining. The outer edges of the gossan show abundant iron oxides and manganese oxides. These oxides may represent former sulfides. Deep weathering of once-abundant sulfides could be the cause of the gossan. Nearby, silicified black shale and silicified dolomite contain as much as 10 percent disseminated pyrite (DiMarchi and others, 1993). Soil and rock samples in the area contain anomalous lead and zinc, and minor silver (DiMarchi and others, 1993).

Comment (Geology): Age = the mineralization is inferred to be Late Proterozoic or younger, based on its cross-cutting relationship with the host rocks (DiMarchi and others, 1993).

References

Reference (Deposit): Schmidt, J.M., 1997, Shale-hosted Zn-Pb-Ag and barite deposits of Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska, 1997: Economic Geology Monograph 9, p. 35-65.

Reference (Deposit): DiMarchi, J.J., Weglarz, T.B., Adams, D.D., Hubert, J.A., and West, A.W., 1993, 1993 annual report reconnaissance program, Doyon option lands: ASA Inc., 120 p. (Report held by Doyon Ltd., Fairbanks, Alaska.)

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