Unnamed Occurrence (ARDF - HU025; near Indian River), Hughes Mining District, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - HU025; near Indian River)	- not defined -
Hughes Mining District	Mining District
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence is located on the west side of Indian River about 4.25 miles south-southwest of the summit of Indian Mountain. The occurrence is along a dirt road at an elevation of about 1,200 feet, about 0.4 mile north of the center of section 14, T. 7 N., R. 24 E. of the Kateel River Meridian. The location is accurate.
Geology: This occurrence consists of disseminated pyrite and sphalerite in fresher specimens of otherwise highly altered intrusive rocks that cut Upper Jurassic(?) and Lower Cretaceous andesite (Miller and Ferrians, 1968). Both the andesite and intrusives show considerable oxidization and alteration. Samples contain anomalous lead, zinc, copper, molybdenum, gold, and silver, with up to 15 ppm silver, 1,000 ppm copper, 30 ppm molybdenum, 3,000 ppm lead, and 700 ppm zinc (Miller and Ferrians, 1968). A float sample of silicified, vuggy meta-rhyolite(?) contains disseminated pyrite and possibly tetrahedrite(?); this sample contains 8.3 ppm gold, 11.5 ppm silver, 794 ppm copper, 1,771 ppm lead, and 998 ppm zinc (Kurtak and others, 1999). Nokleberg and others (1996) describe, without a specific location, the deposit in the Indian Mountain area as a porphyry Cu-Au system. This system, which likely includes all the individual lode occurrences within the area, consists predominately of chalcopyrite- and tourmaline-bearing intrusive breccias that are surrounded by concentric phyllic-argillic-propylitic alteration halos. A pyrite zone surrounds the intrusive rocks.
Workings: Only surface sampling.
Age: The andesite that host the deposit is Cretaceous or early Tertiary.
Alteration: The intrusive rocks and andesite are oxidized and altered but no details of the alteration are described.

Commodities (Major) - Au, Zn; (Minor) - Ag, Cu, Mo, Pb
Development Status: None
Deposit Model: Porphyry Cu-Mo(?) (Cox and Singer, 1986; model 21a)

Other Databases

Link to USGS - Alaska:	HU025

Other Regions, Features and Areas containing this locality

References