Kilborne Prospect, Prince William Sound Mining District, Valdez-Cordova Census Area, Alaska, USAi

Regional Level Types
Kilborne Prospect	Prospect
Prince William Sound Mining District	Mining District
Valdez-Cordova Census Area	Census Area
Alaska	State
USA	Country

Location: The prospect is located one mile north of the head of Northeast Arm of Mummy Bay at an elevation of 1,500 feet. This is in the SE1/4 section 19, T. 2 N., R. 10 E., of the Seward Meridian. This is location 244 of Tysdal (1978 [MF-880-A]) and location S-35 of Jansons and others (1984). This location is accurate to within a quarter of a mile.
Geology: The prospect consists of a zone of iron-stained, sheared greenstone of the Orca Group of early Teriary age (Nelson and others, 1985). A 71-foot-long adit was driven to intersect the shear zone. The shear zone is 30 feet wide; it trends N2E and dips 80E. There is a shallow open cut above the adit. The mineralization consists of thin lenses of massive chalcopyrite, pyrrhotite, pyrite, and some bornite. Thin quartz-rich lenses within the shear zone also carry sulfide minerals (Kurtak and Jeske, 1986). Two chip samples, 2.5 and 1.5 feet wide, from the adit contained 1,650 ppm and 0.16 percent copper, and 1,250 and 1,550 ppm zinc. A grab sample from the dump contained 7.1 percent copper and 0.25 percent zinc (Kurtak and Jeske, 1986).
Workings: Workings on the prospect consist of a 71-foot-long adit at 1,500 feet elevation and a 15-foot open cut above the adit. Two chip samples, 2.5 and 1.5 feet wide, were collected from the adit; they contained 1,650 ppm and 0.16 percent copper along with 1,250 and 1,550 ppm zinc. A grab sample from the dump contained 7.1 percent copper and 0.25 percent zinc (Kurtak and Jeske, 1986).
Age: Tertiary or younger; the mineralization is in rocks of the Orca Group of Tertiary age.

Commodities (Major) - Cu; (Minor) - Zn
Development Status: None
Deposit Model: Cyprus massive sulfide (Cox and Singer, 1986; model 24a)

Other Databases

Link to USGS - Alaska:	SR323

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References