Unnamed (near head of Glacier Gulch)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals arsenopyrite; pyrite
Gangue minerals carbonate minerals; quartz

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale D-1
Latitude 62.94084
Longitude -156.48659
Nearby scientific data Find additional scientific data near this location
Location and accuracy 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.

Geologic setting

Geologic description

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).
Geologic map unit (-156.488954861075, 62.9402068608533)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Undated; probably Late Cretaceous, based on nearby dated intrusions along Ganes-Yankee Creek fault (Bundtzen and Miller, 1997).
Alteration of deposit The dike has undergone carbonatizationand, and the sulfides are weathered to iron oxides.

Production and reserves

Workings or exploration 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.
Indication of production None

References