Nation Gossan

Prospects, Active

Commodities and mineralogy

Main commodities Pb; Zn
Other commodities Ag
Ore minerals galena; pyrite; sphalerite

Geographic location

Quadrangle map, 1:250,000-scale CY
Quadrangle map, 1:63,360-scale B-1
Latitude 65.29
Longitude -141.05
Nearby scientific data Find additional scientific data near this location
Location and accuracy 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.

Geologic setting

Geologic description

The Nation Gossan prospects consist of an oxidized fault breccia striking N 20 E 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 NE 1/4 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).
Geologic map unit (-141.052378070875, 65.2897383971975)
Mineral deposit model Carbonate-hosted Zn-Pb (Schmidt, 1997; Cox and Singer, 1986; model 32b).
Mineral deposit model number 32b
Age of mineralization The mineralization is inferred to be Late Proterozoic or younger, based on its cross-cutting relationship with the host rocks (DiMarchi and others, 1993).
Alteration of deposit 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).

Production and reserves

Workings or 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.
Indication of production None

Additional 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.

References

MRDS Number 10307406

References

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, Limited, Fairbanks, Alaska.)
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.
Reporters C.E. Cameron (ADGGS)
Last report date 4/7/2000