Johnson Prospect, Hope Mining District, Kenai Peninsula Borough, Alaska, USAi

Regional Level Types
Johnson Prospect	Prospect
Hope Mining District	Mining District
Kenai Peninsula Borough	Borough
Alaska	State
USA	Country

Location: The prospect is located in the NW1/4 section 12, T. 6 N., R. 2 W., of the Seward Meridian, at elevations between 2.600 and 4,300 feet. The prospect is situated on the north side of Summit Creek, one mile west of the Seward Highway. The prospect is about 0.75 mile west of its indicated position (Johnson Mine) on the 1994 U.S. Geological Survey Seward C-7 topographic map. This location is accurate to within 300 feet. This is location 30 of Cobb and Richter (1972), location 35 of MacKevett and Holloway (1977), location 50 of Cobb and Tysdal (1980), and location S-258 of Jansons and others (1984).
Geology: The deposit at the Johnson propect consists of quartz-calcite stringers that heal fractures in a 4- to 8-foot-wide felsic dike. The stringers are 4 to 6 inches wide and contain sparse arsenopyrite and pyrite and a little gold. The dike is apparently an extension of the Gilpatrick dike of Eocene age, which at this site strikes N12E and dips vertically. The dike intrudes Valdez Group rocks of Late Cretaceous age (Cobb and Tysdal, 1980).
Workings: Workings consist of a 40-foot adit at an elevation of 2,800 feet and open cuts at 3,500 feet and 4,300 feet (Tuck, 1933). In the 1930's, a half-mile-long trail led to the workings from the Oracle mine (SR142). A sample collected in the 40-foot adit across a 4.5-foot width assayed at 0.03 ounce of gold and 0.1 ounce of silver per ton (Tuck, 1933).
Age: Eocene or younger; the veins are in an Eocene dike.

Commodities (Major) - Ag, Au; (Minor) - As
Development Status: None
Deposit Model: Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)

Other Databases

Link to USGS - Alaska:	SR144

Other Regions, Features and Areas containing this locality

References