Deimos Prospect, Koyukuk Mining District, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Deimos Prospect	Prospect
Koyukuk Mining District	Mining District
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

See also: Io (CH102), Ginger (CH060), Hurricane-Diane (CH062), Venus (CH065), Pilgrim (CH099), Mike (CH100), Vicki (CH097), Cindy (CH098), and Evelyn Lee (CH059).
Location: The Deimos prospect is at an elevation of about 4,300 feet just west of the upper reaches of Sheep Creek (SE1/4 sec. 36, T. 34 N., R. 8 W. and SW1/4 sec. 31, T. 34 N., R. 7 W., of the Fairbanks Meridian) approximately 6 miles north-northwest of the confluence of Sheep Creek and Robert Creek. The location is accurate within a 1-mile radius.
Geology: The Deimos prospect is one of a number of skarn deposits in the Chandalar area which have been described in general by Newberry and others (1986). These skarns are all northwest of a belt of Devonian(?) granitic rocks informally named the Horace Mountain plutons. Many exhibit both prograde and retrograde mineral assemblages. Newberry and others (1986) stated that their mineralogy, mineralization, and alteration place them in the category of continental-margin, porphyry-related copper skarns. Published information about the geology of individual skarns is scarce, but brief descriptions of the prospect by Newberry and others (1986) indicated that the Deimos prospect is a Cu-Ag skarn. Based on a hand specimen description (Newberry and others, 1986), the skarn contains garnet, epidote, chalcopyrite, and pyrite. Analysis of the hand specimen returned a value of 1.9 percent Cu. In a listing posted on the Ventures Resource Corporation (currently exploring Doyon lands in the area under an agreement with Doyon, Limited) website (URL http://www.venturesresource.com/), the Deimos prospect is classified as a Cu-Au prospect, although there are no data supporting the presence of appreciable gold.
Workings: Surface sampling.
Age: Devonian(?) based on reported Early Devonian Pb/Pb zircon ages from the associated Baby Creek batholith and Horace Mountain plutons (Dillon and others, 1996).
Alteration: Calc-silicate.

Commodities (Major) - Cu; (Minor) - Ag(?)
Development Status: None
Deposit Model: Cu skarn deposits (Cox and Singer, 1986; 18b)

Other Databases

Link to USGS - Alaska:	CH061

Other Regions, Features and Areas containing this locality

References