Unnamed Occurrence (ARDF - WI128; near the head of Thompson Pup), Koyukuk Mining District, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - WI128; near the head of Thompson Pup)	- not defined -
Koyukuk Mining District	Mining District
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence represents several sites that cover an area approximately 0.5 miles in diameter; the center of the area is at an elevation of about 2,900 feet near the head of Thompson Pup. Thompson Pup is a short tributary to Fay Creek (WI112). The location is accurate.
Geology: This occurrence consists of sulfide-bearing quartz-carbonate(siderite) veins at the head of Thompson Pup (Kurtak and others, 1999). Several samples of the veins contain up to 186 ppb gold, 0.4 ppm silver, 0.35% antimony, 3,062 ppm copper, and 765 ppm arsenic. The veins are in phyllite; they are up to 4 feet thick; and contain varying amounts of arsenopyrite, pyrite, pyrrhotite, limonite, and chalcopyrite(?). Eden (2000) describes three quartz-arsenopyrite-gold(?) veins in Thompson Pup, but not their exact location. He also notes that data from an unpublished report indicate that these veins contain gold, but that assay results have not been encouraging. The rocks in the area are mostly micaceous schist, phyllite, and metasiltstone (Eden, 2000).
Workings: Only surface sampling.

Commodities (Major) - Au; (Minor) - Ag, As, Cu, Sb
Development Status: None
Deposit Model: Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a)

Other Databases

Link to USGS - Alaska:	WI128

Other Regions, Features and Areas containing this locality

References