|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||The mine is located in the SE1/4 section 18, T. 9 N., R. 1 W., of the Seward Meridian. It is at elevations between 2,800 and 3,100 feet, on the divide between Bear and Palmer Creeks. This is location 7 of Cobb and Richter (1972), location 6 of MacKevett and Holloway (1977), location 12 of Cobb and Tysdal (1980), and location S-299 of Jansons and others (1984). The location is accurate to within a quarter of a mile.|
The deposit at the Nearhouse mine consists of a banded and brecciated quartz vein averaging 20 inches wide. The banding is dark gray and is believed to be attributed to organic material. The vein strikes N50-80W and dips 60-90N. Metallic minerals include small amounts of arsenopyrite, galena, sphalerite, pyrite, and gold, which collectively make up less than one-half percent of the vein material. The vein is cut off at both ends by left-lateral transverse faults. However, the vein has good continuity at the surface and to a depth of more than 80 feet in the winze (Hoekzema and Sherman, 1983).The host rock is well-bedded, slightly metamorphosed siltstone and sandstone (Hoekzema and Sherman, 1983) of the Valdez Group of Late Cretaceous age (Nelson and others, 1985). The beds strike N15E and dip 60W at the 3,100-foot adit level. Abundant sedimentary features at the portal suggest that the bedding is overturned (Mitchell, 1979). Felsic dikes crop out nearby, and one was intersected in the east drift of the 3,100-foot level adit.
|Geologic map unit||(-149.52197144773, 60.8652392995066)|
|Mineral deposit model||Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a)|
|Mineral deposit model number||36a|
|Age of mineralization||Cretaceous or younger; the vein cuts rocks of the Valdez Group of Late Cretaceous age.|
|Workings or exploration||
The workings at this mine consist of two adits: the upper adit, at 3,100 feet elevation, has 450 feet of workings plus an 80-foot winze; the lower adit, at an elevation of 3,050 feet, is 35 feet long (Jansons and others, 1984). In 1981, some old equipment at the site included a Worthington compressor. An old mine road leads to the workings from the Palmer Creek road.
Tuck (1933) visited the mine in 1931 and collected eight samples that assayed from 0.03 to 1.3 ounces of gold per ton and 0.3 to 3.5 ounces of silver per ton. The gold assays of the eight samples averaged 0.7 ounce per ton.In 1980 and 1981, the U.S. Geological Survey and U.S. Bureau of Mines mapped and sampled the deposit (Hoekzema and Sherman, 1983). The Bureau collected six chip samples that assayed from a trace to 0.45 ounce of gold per ton and from 0.02 to 0.13 ounce of silver per ton. Reserves are estimated at 7,000 tons of ore containing 0.2 ounce of gold per ton and 0.3 ounce of silver per ton (Jansons and others, 1984).
|Indication of production||Yes; small|
|Reserve estimates||Reserves are 7,000 tons of ore containing 0.2 ounce of gold per ton and 0.3 ounce of silver per ton (Jansons and others, 1984).|
|Production notes||Recorded production is 102 ounces of gold and 3 ounces of silver (Jansons and others, 1984).|
Additional commentsHoekzema and Sherman (1983) reported dynamite and caps in the west drift of the 3,100 foot level. The explosives were destroyed by the Army Explosive Ordinance Disposal Unit in 1995 (C. S. Huber, oral communication, 2000).
Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p.
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.
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.
Roehm, J.C., 1940, Summary report of miscellaneous investigations in the Bethel, Otter, Innoko, and Kenai precincts: Alaska Territorial Department of Mines Itinerary Report 195-29, 15 p.
Roehm, J.C., 1941, Summary report of mining investigations in the Kenai Precinct: Alaska Territorial Department of Mines Itinerary Report 85-4, 8 p., 5 sheets.
Smith, P.S., 1937, Mineral industry of Alaska in 1935: U.S. Geological Survey Bulletin 880-A, p. 1-95.
Smith, P.S., 1938, Mineral industry of Alaska in 1936: U.S. Geological Survey Bulletin 897-A, p. 1-107.
Smith, P.S., 1939, Mineral industry of Alaska in 1937: U.S. Geological Survey Bulletin 910-A, p. 1-113.
Smith, P.S., 1941, Mineral industry of Alaska in 1939: U.S. Geological Survey Bulletin 926-A, p. 1-106.
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||2/21/2000|