Nation Gossan Prospects, Black Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
Nation Gossan Prospects	Group of Prospects
Black Mining District	Mining District
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

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.
Location: 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.
Geology: 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).
Workings: 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.
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).
Alteration: 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).

Commodities (Major) - Pb, Zn; (Minor) - Ag
Development Status: None
Deposit Model: Carbonate-hosted Zn-Pb (Schmidt, 1997; Cox and Singer, 1986; model 32b).

Other Databases

Link to USGS - Alaska:	CY021

Other Regions, Features and Areas containing this locality

References