Nation Gossan

Prospect in Alaska, United States with commodities Lead, Zinc, Silver

Geologic information

Identification information

Deposit ID 10307406
Record type Site
Current site name Nation Gossan

Geographic coordinates

Geographic coordinates: -141.05277, 65.2898 (WGS84)
Relative position The Nation Gossan prospects are located in section 1, T. 5 N., R. 32 E., of the Fairbanks Meridian. The location is accurate to within 2 miles. These prospects are on Doyon, Limited selected or conveyed land.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Lead Primary
Zinc Primary
Silver Secondary

Materials information

Materials Type of material
Galena Ore
Pyrite Ore
Sphalerite Ore

Alteration

  • (Local) 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).

Mineral occurrence model information

Model code 228
USGS model code 32b
BC deposit profile E12
Deposit model name Mississippi Valley, Appalachian Zn
Mark3 model number 42

Nearby scientific data

(1) -141.05277, 65.2898

Comments on the geologic information

  • 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).
  • 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).

Economic information

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Active

Mining district

District name Black

Comments on the workings information

  • 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.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF CY021

Bibliographic references

  • 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.)

  • 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.

Comments on the references

  • Primary Reference = DiMarchi and others, 1993

General comments

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

Reporter information

Type Date Name Affiliation Comment
Reporter 07-APR-00 Cameron, C.E. Alaska Division of Geological and Geophysical Surveys