Slate Creek No. 2 (ARDF #SR040) Au

Slate Creek No. 2

Occurrence, Inactive

Commodities and mineralogy

Main commodities	Au
Other commodities	Cu; Pb; Zn
Ore minerals	arsenopyrite; chalcopyrite; galena; gold; pyrite; sphalerite
Gangue minerals	quartz

Geographic location

Quadrangle map, 1:250,000-scale	SR
Quadrangle map, 1:63,360-scale	D-6
Latitude	60.8878
Longitude	-149.2321
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This ocurrence is located in the NW1/4 section 11, T. 9 N., R. 1 E., of the Seward Meridian. It is near sea level about a half-mile east of Slate Creek. This is location 17 of Cobb and Richter (1972), location 13 of MacKevett and Holloway (1977), location 4 of Cobb and Tysdal (1980), and location S-314 of Jansons and others (1984). The location is accurate to within a quarter of a mile.

Geologic setting

Geologic description This occurrence consists of fault-controlled quartz stringers in slate of the Valdez Group of Late Cretaceous age (Tysdal, 1978 [MF-880-A]; Hoekzema and Sherman, 1983). The quartz stringers are 1 to 2 inches wide. The fault zone is 4 feet wide, strikes N30E, and dips 60SE (Hoekzema and Sherman, 1983). Martin and others (1915) indicated that the vein strikes N70E and dips 70E. The quartz stringers carry arsenopyrite, chalcopyrite, galena, pyrite, sphalerite, and free gold (Moffit, 1905). The U.S. Bureau of Mines identified only minor pyrite and arsenopyrite (Hoekzema and Sherman, 1983). This deposit may be an extension of the veins at the Slate Creek No. 1 prospect (SR038) and Kenai Lu mine (SR035). All three veins are fault controlled and are nearly on strike (Martin and others, 1915).
Geologic map unit	(-149.23426721568, 60.8872433961174)
Mineral deposit model	Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)
Mineral deposit model number	36a
Age of mineralization	Cretaceous or younger; the quartz stringers cut rocks of the Valdez Group of Late Cretaceous age.

Production and reserves

Workings or exploration	There are no workings or improvements at this occurrence and no record of any production. The U.S. Bureau of Mines collected one chip sample in 1981; the sample assayed trace amounts of gold and silver (Jansons and others, 1984).
Indication of production	None
Additional comments This deposit may be an extension of the veins at the Slate Creek No. 1 prospect (SR038) and Kenai Lu mine (SR035). All three veins are fault controlled and are nearly on strike (Martin and others, 1915).

References

References Cobb, E.H., and Richter, D.H., 1972, Metallic mineral resources map of the Seward quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-466, 2 sheets, scale 1:250,000. 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. Martin, G.C., Johnson, B.L., and Grant, U.S., 1915, Geology and mineral resources of Kenai Peninsula, Alaska: U.S. Geological Survey Bulletin 587, 243 p. Moffit, F.H., 1905, Gold placers of Turnagain Arm, Cook Inlet, in Brooks, A.H., Report on progress of investigations of mineral resources of Alaska in 1904, U.S. Geological Survey Bulletin 259, p. 90-99. Moffit, F.H., 1906, Gold fields of the Turnagain Arm region: U.S. Geological Survey Bulletin 277, p. 7-52. 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. Tysdal, R.G., 1978, Mines, prospects, and occurrences map of the Seward and Blying Sound quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-880-A, 2 sheets, scale 1:250,000.
Reporters	Jeff A. Huber (Anchorage)
Last report date	4/2/2000