|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||The prospect is located near the center of section 20, T. 7 N., R. 1 E., of the Seward Meridian. The map site is at an elevation of 1,700 feet, on the west valley wall of upper Lynx Creek. This location is accurate to within a quarter of a mile. The is location 33 of Cobb and Richter (1972), location 22 of MacKevett and Holloway (1977), location 34 of Cobb and Tysdal (1980), and location S-272 of Jansons and others (1984).|
Geologic descriptionThe country rock at this prospect is slate and sandstone of the Valdez Group of Late Cretaceous age (Nelson and others, 1985). The deposit consists of auriferous, sulfide-bearing, quartz veins, 6 inches to 2 feet thick. The veins are in a 3- to 10-foot-wide shear zone that strikes north to N10W, nearly parallel to the slaty cleavage of the country rocks (Paige and Knopf, 1907; Tysdal, 1978 [MF-880-A]). The veins contain podiform masses of chalcopyrite accompanied by pyrrhotite and pyrite. Pyrite also occurs in the altered wall rock (Paige and Knopf, 1907). The deposit has an exposed strike length of about 110 feet.
|Geologic map unit||(-149.315635049087, 60.6813252653629)|
|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 veins cut rocks of the Valdez Group of Late Cretaceous age.|
|Alteration of deposit||Altered wall rock contains pyrite.|
|Workings or exploration||
Workings include two adits and a prospect pit. The prospect pit is situated above the upper adit. The upper adit, at an elevation of about 2,900 feet, consists of 335 feet of crosscut, 110 feet of drifts, a winze, and some minor stope development. The lower adit, at an elevation of about 1,800 feet, is 800 feet long but caved (Paige and Knopf, 1907).
Access is provided by a 4-wheel-drive road that begins at the Bench Lake trailhead, crosses Center and Bench Creeks, and leads to an old roadhouse building. From there, an unmaintained trail continues up the east side of Lynx Creek to the collapsed mine buildings (Hoekzema and Sherman, 1983).In 1981, the U.S. Bureau of Mines located the massive sulfide outcrop and reopened, mapped, and sampled the upper adit (Hoekzema and Sherman, 1983). Average grades of samples are 2.5 percent copper, 0.1 percent zinc, 0.01 ounce of gold per ton, and 0.3 ounce of silver per ton. Samples assayed 0.002 to 4.4 percent copper, trace to 0.41 percent zinc, a trace to 0.116 ounce of gold per ton, and a trace to 0.75 ounce of silver per ton (Jansons and others, 1984).
|Indication of production||None|
|Reserve estimates||Reserves are estimated at 6,000 tons of ore containing 300,000 pounds of copper, 12,000 pounds of zinc, 1,800 ounces of silver, and 60 ounces of gold (Hoekzema and Sherman, 1983).|
Additional commentsAlthough this copper deposit was one of the earliest lode discoveries in the Moose Pass-Hope District, the Ready Bullion remains the only copper prospect in the district (Tuck, 1933).
Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p.
Brooks, A.H., 1911, The Mount McKinley region, Alaska, with descriptions of the igneous rocks and of the Bonnifield and Kantishna districts by L.M. Prindle: U.S. Geological Survey Professional Paper 70, 234 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.
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.
Paige, Sidney, and Knopf, Adolph, 1907, Geologic reconnaissance in the Matanuska and Talkeetna basins, Alaska: U.S. Geological Survey Bulletin 327, 71 p.
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||1/29/2000|