|Quadrangle map, 1:250,000-scale||SR|
|Quadrangle map, 1:63,360-scale||C-7|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This prospect is located in the NW1/4 section 5, T. 7N., R. 1 W., of the Seward Meridian. It is situated on the east end of the divide between Frenchy and Pass Creeks, at an elevation of 3,000 feet. The location is accurate to within a quarter of a mile. This is location 19 of MacKevett and Holloway (1977), location 31 of Cobb and Tysdal (1980), and location S-275 of Jansons and others (1984).|
Geologic descriptionThe deposit consists of auriferous, sulfide-bearing, quartz-carbonate veins and pods that heal fractures in an Eocene(?) felsic dike (Hoekzema and Sherman, 1983). The dike, which intrudes slate and graywacke of the Valdez Group of Late Cretaceous age (Nelson and others, 1985), averages 16 feet wide at the discovery. The quartz bodies are as much as 10 feet wide and contain arsenopyrite, chalcopyrite, galena, and sphalerite. Arsenopyrite also occurs in the dike rock. Malachite staining occurs locally. The sedimentary country rock strikes N15E and dips steeply west; the dike strikes N10E and dips 30 to 50W, the dip increasing with depth (Hoekzema and Sherman, 1983). The dike extends from a point on the north side of Frenchy Creek southward to the Pass Creek drainage basin (Tuck, 1933).
|Geologic map unit||(-149.505245623451, 60.7309161325687)|
|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 age of felsic dike host rock is Eocene?|
|Workings or exploration||
The workings on this prospect consist of a 50-foot inclined (30 degrees) shaft with a caved winze at the bottom, prospect pits, and trenching (Hoekzema and Sherman, 1983).The U.S. Bureau of Mines collected surface and subsurfaces samples in 1979 (Hoekzema and Sherman, 1983). A selected dump sample assayed 0.42 ounce of gold per ton and 24.21 ounces of silver per ton. Three chip samples from the incline assayed a trace of gold and 0.02 to 0.22 ounce of silver per ton (Jansons and others, 1984).
|Indication of production||None|
Additional commentsTuck (1933) suggests that the dike is probably a continuation of the dike that occurs to the south; see, for example, the Gilpatrick Dike mine, SR136.
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.
Hoekzema, R.P., and Sherman, G.E., 1983, Mineral investigations in the Chugach National Forest, Alaska (Peninsula study area): U.S. Bureau of Mines in-house report; held at U.S. Bureau of Land Management Alaska State Office, Anchorage, 524 p.
Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral occurrences in the Chugach National Forest, southcentral Alaska: U.S. Bureau of Mines Mineral Land Assessment 5-84, 218 p., 2 sheets, scale 1:250,000.
MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.
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||3/5/2000|