Unnamed Prospect (ARDF - ID034; west of upper Yankee Creek), Iditarod Mining District, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Unnamed Prospect (ARDF - ID034; west of upper Yankee Creek)	- not defined -
Iditarod Mining District	Mining District
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

Location: This prospect is at an elevation of about 1,900 feet above a low saddle on an east-west-trending ridge near the head of Yankee Creek. The prospect is about 600 feet west of the Telephone Hill prospect (ID035) near the center of the N1/2 NW1/4, section 14, T. 33 N., R. 38 W., of the Seward Meridian. The location is accurate.
Geology: This deposit at this prospect is a thin gold-quartz-sulfide vein that cuts a quartz-feldspar porphyry dike near its contact with sandstone of the Upper Cretaceous, Kuskokwim group (Miller and Bundtzen, 1994). The dike, as partly exposed in rubble crop, is about 25 feet thick and strikes about N70E. The vein, which is probably subparallel to the dike, is about 16 inches thick The vein contains about 2 percent, fine-grained arsenopyrite and less abundant, bladed stibnite crystals. Free gold occurs in pockets of iron oxide oxidized from the sulfides. One sample of sulfide-bearing quartz vein contained 7.02 parts per million gold (Bundtzen and Laird, 1983; McGimsey and others, 1988). The quartz-feldspar porphyry dike is part of the dike-sill complex associated with the Ganes-Yankee Creek fault zone (Bundtzen and Laird, 1983; Bundtzen and Miller, 1997).
Workings: Prior to World War II, the prospect was explored by two elongate pits about 50 feet apart. West Gold Inc. explored the area and collected soil samples in the prospect area in 1989; Placer Dome Exploration collected soils in the area in 1997. North Star Exploration, Inc. conducted exploration and sampled rocks and soils in 1998 and 2001.
Age: Biotite from a dike at the Telephone Hill prospect (ID035) nearby has a 40Ar/39Ar age of 70.6 Ma (Bundtzen and others, 2000).
Alteration: The quartz-feldspar dike is moderately sericitized.

Commodities (Major) - Au; (Minor) - Ag, As, Sb
Development Status: None
Deposit Model: Low sulfide gold-quartz vein or Porphyry gold-copper deposit; (Cox and Singer,

Other Databases

Link to USGS - Alaska:	ID034

Other Regions, Features and Areas containing this locality

References