|Quadrangle map, 1:250,000-scale||SR|
|Quadrangle map, 1:63,360-scale||D-7|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This prospect is located in the SW1/4 section 31, T. 9 N., R. 1 W., of the Seward Meridian. It is at an elevation of 2,000 feet, on the southwest side of Bonanza Creek. This is location 18 of Cobb and Tysdal (1980). The location is accurate to within a quarter of a mile.|
Geologic descriptionThe principal deposit at this prospect consists of auriferous, sulfide-bearing quartz-calcite veins that heal fractures in a 3-foot-wide Eocene(?) felsic dike (Kenai Star dike; see SR022) (Tuck, 1933). The veins make up about 2 percent of the dike, which strikes N30E and dips 45 to 60 E. and intrudes slate and sandstone of the Valdez Group of Late Cretaceous age (Tuck, 1933; Tysdal, 1978 [MF-880-A]). Thin quartz-calcite-cemented fractures in the slate and sandstone have 2.5- to 5-inch-wide sericitic alteration envelopes (Tysdal, 1978 [MF-880-A]). There is little alteration near the larger quartz veins. The deposit was explored by a 69-foot adit. A sample of mineralized dike yielded a small amount of arsenopyrite and a trace of gold.
|Geologic map unit||(-149.527464457862, 60.8262316558084)|
|Mineral deposit model||Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)|
|Mineral deposit model number||36a|
|Age of mineralization||Eocene(?) or younger; the veins heal fractures in an Eocene(?) dike.|
|Alteration of deposit||Quartz-calcite-filled hairline fractures in the slate and sandstone are bordered by sericitic alteration envelopes 2.5 to 5 inches wide.|
|Workings or exploration||Underground workings consist of one 69-foot adit (Tysdal, 1978 [MF-880-A]).|
|Indication of production||None|
Additional commentsThe felsic dike at this prospect probably is an extension of the Kenai Star dike (SR022). Mitchell (1979) examined the area in 1977. The results of his work are not included in this record.
Cobb, E.H., and Tysdal, R.G., 1980, Summaries of data on and list of references to metallic and selected nonmetallic mineral deposits in the Blying Sound and Seward quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-621, 276 p.
Mitchell, P.A., 1979, Geology of the Hope-Sunrise (gold) mining district, north-central Kenai Peninsula, Alaska: Stanford University Master of Science thesis, 123 p
Nelson, S.W., Dumoulin, J. A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, 16 p., 1 sheet, scale 1:250,000.
Tuck, Ralph, 1933, The Moose Pass-Hope district, Kenai Peninsula, Alaska: U.S. Geological Survey Bulletin 849-I, p. 469-530.
|Reporters||Jeff A. Huber (Anchorage)|
|Last report date||8/6/2000|