Unnamed Occurrence (ARDF - ID030; near head of Glacier Gulch), Innoko Mining District, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - ID030; near head of Glacier Gulch)	- not defined -
Innoko Mining District	Mining District
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence is near the head of Glacier Gulch and about 1.8 miles east-southeast of the mouth of Spaulding Creek. It is at an elevation of about 1,600 feet in the NE1/4 NE1/4, section 21, T. 33 N., R. 38 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence consists of a 1.5-foot-thick, quartz-carbonate-sulfide vein in an altered feldspar-rich, dacite dike that intrudes shale and sandstone of the Upper Cretaceous, Kuskokwim Group (Bundtzen and Laird, 1982; Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). Arsenopyrite and pyrite are disseminated near the edges of the vein. The dike is part of the intrusive suite associated with the Ganes-Yankee Creek fault (Bundtzen and Miller, 1997). One sample of sulfide-bearing quartz vein contained 1,110 parts per billion gold but no other elements in anomalous concentrations (Bundtzen and Laird, 1982).
Workings: Several prospect pits, probably dug before World War II, explored the vein. Placer Dome Exploration explored the Ganes-Yankee Creek fault and dike swarm in this area in 1997; their data are not available.
Age: Undated; probably Late Cretaceous, based on nearby dated intrusions along Ganes-Yankee Creek fault (Bundtzen and Miller, 1997).
Alteration: The dike is carbonatized and the sulfides are weathered to iron oxides.

Commodities (Major) - Au
Development Status: None
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c).

Other Databases

Link to USGS - Alaska:	ID030

Other Regions, Features and Areas containing this locality

References