Kilborne

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Zn
Ore minerals bornite; chalcopyrite; pyrite; pyrrhotite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale A-3
Latitude 60.2464
Longitude -147.7741
Nearby scientific data Find additional scientific data near this location
Location and accuracy 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.

Geologic setting

Geologic description

The prospect consists of a zone of iron-stained, sheared greenstone of the Orca Group of early Tertiary 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 N 2 E and dips 80 E. 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).
Geologic map unit (-147.776164757267, 60.2458418798666)
Mineral deposit model Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Mineral deposit model number 24a
Age of mineralization Tertiary or younger; the mineralization is in rocks of the Orca Group of Tertiary age.

Production and reserves

Workings or exploration 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).
Indication of production None

References