Hayes Glacier West Prospect, Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
Hayes Glacier West Prospect	Prospect
Delta River Mining District	Mining District
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

Location: The prospect is about 2.5 miles northeast of peak 8376, a northern spur of Mount Hayes, at an elevation of 5,100 feet. The prospect is in the SE1/4SE1/4 section 19, T. 14 S., R. 6 E., Fairbanks Meridian, and corresponds to locality N6 in table 2 of Nokleberg and others (1991).
Geology: This prospect is part of a belt of massive sulfide deposits that is about 8 miles long and as much as one-third mile wide. Deposits in the belt consist of massive sulfide lenses, pods, and disseminations of pyrrhotite and pyrite, along with less abundant galena, sphalerite, and chalcopyrite. Individual lenses and pods are as much as 3 feet thick. The host rocks of the Hayes Glacier West deposit are derived from Devonian felsic to intermediate volcanic rocks, mainly andesite, dacite, and quartz keratophyre flows and tuffs, and from Devonian or older shale, marl, and marble (Nokleberg and Aleinikoff, 1985; Lange and others, 1993). The rocks are intensely deformed and feature abundant mylonite schist; they were first metamorphosed to lower amphibolite facies and then retrograded to lower greenschist facies. Samples collected during reconnaissance sampling by the U.S. Geological Survey in the 1980's contained as much as 0.72 percent lead, 0.69 percent zinc, 0.5 percent arsenic, and 0.11 percent copper (Nokleberg and others, 1991).
Workings: Grab samples contained as much as 0.11 percent copper 0.72 percent lead, 0.69 percent zinc, 0.2 part per million (ppm) gold, and 5 ppm silver (Nokleberg and others, 1991). Trace elements characteristic of the deposit include gold (to 0.2 ppm), silver (to 5 ppm), and tin (to 100 ppm). American Copper and Nickel Company sampled the prospect in 1993 (W.T. Ellis, unpublished data, 1993) and concluded that the mineralization consists mainly of pyrrhotite and has generally low base metals values.
Age: Devonian, the age of the host strata.

Commodities (Major) - Pb, Zn; (Minor) - Ag, As, Au, Cu, Sn
Development Status: None
Deposit Model: Kuroko massive sulfide (Cox and Singer, 1986; model 28a).

Other Databases

Link to USGS - Alaska:	MH007

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References