|Quadrangle map, 1:250,000-scale||TL|
|Quadrangle map, 1:63,360-scale||C-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||C.C. Hawley and Associates, Inc. (1978, Fig. 4.2-B(3)) show this placer in Canyon Creek, a tributary to Long Creek which flows into the Tokositna River. Unpatented placer claims cover the entirety of Canyon Creek from the northeast quarter of Section 21 to the northwest quarter of Section in T. 29 N., R. 8 W., of the Seward Meridian. Coordinates for this locality are given for the site in the northeast quarter of Section 21, T. 29 N., R. 8 W., of the Seward Meridian. This property is shown by Clark and Cobb (1972) as locality 31 and by Reed and others (1978) as locality 86.|
Canyon, Divide and Long Creeks drain across the contact between Mesozoic slate and graywacke (KJs) and Tertiary strata of the Sterling (?) (Tcp) and Tyonek (?) (Tts) Formations of the Kenai Group (Reed and Nelson, 1980). Cobb and Reed (1980) report that the placer deposits in Canyon Creek are probably derived directly from local mineralized zones in bedrock, which is mainly Mesozoic slate (KJs), intruded by Tertiary and (or) Cretaceous (TKi) acidic dikes and cut by quartz stringers. The bedrock locally contains visible pyritized zones.
According to Mertie (1919) stream gravels at this locale have a pay streak which ranges from 1 to 15 feet in width (average: 6 feet) and 2 to 8 feet in depth. Gold is found on or near bedrock. Gravel is mostly cobble-sized clasts 6 inches in diameter with some boulders up to 2 feet in diameter. Gold, platinum, magnetite, ilmenite, garnet, zircon, and cassiterite, some of which is crystalline with unworn edges, are noted in concentrates by Mertie (1919). This suggested to him that the gold and cassiterite were largely derived from mineralized rocks of the drainage area.Cobb and Reed (1980) report that most, if not all, references to Long Creek are probably to Canyon Creek. Mining has also been reported on Ramsdyke Creek (Cobb, 1973), which runs along the northwest side of the ridge north of the headwater basin of Canyon Creek.
|Geologic map unit||(-150.780288897828, 62.5924835308203)|
|Mineral deposit model||Placer Au-PGE (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Tertiary and Pleistocene.|
|Workings or exploration||The drainage has been prospected and mined by various small scale surface methods.|
|Indication of production||Yes; small|
Additional commentsCobb and Reed (1980) state that most, if not all, references to Long Creek are probably to Canyon Creek. Mining has also been reported on Ramsdyke Creek (Cobb, 1973), which runs along the northwest side of the ridge north of the headwater basin of Canyon Creek.
|MRDS Number||A011573; M045411|
Brooks, A.H., 1921, The future of Alaska mining, in Martin, G.C., and others, Mineral resources of Alaska, 1917: U.S. Geological Survey Bulletin 714-A, p. 5-57.
Capps, S.R., 1912, Gold placers of the Yentna district: U.S. Geological Survey Bulletin 520-F, p. 174-200.
C.C. Hawley and Associates, Inc., 1978, Mineral appraisal of lands adjacent to Mt. McKinley National Park, Alaska: U.S. Bureau of Mines Open-File Report 24-78, 277 p., 12 sheets.
Clark, A.L., and Cobb, E.H., 1972, Metallic mineral resources map of the Talkeetna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-369, 1 sheet, scale 1:250,000.
Clark, A.L., and Hawley, C.C., 1968, Reconnaissance geology, mineral occurrences, and geochemical anomalies of the Yentna district, Alaska: U.S. Geological Survey Open-File Report 68-35, 64 p.
Cobb, E.H., and Reed, B.L., 1980, Summaries of data on and lists of reference to metallic and selected nonmetallic mineral deposits in the Talkeetna quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-884, 106 p.
Garrett, D. R., 1998, The Blue Ribbon mine, Yentna mining district, Alaska: Worldwide Web URL http://www.alaska.net/~freegold/brm.html.
Hawley, C.C., and Clark, A.L., 1973, Geology and mineral deposits of the Chulitna -Yentna mineral belt, Alaska: U.S. Geological Survey Professional Paper 758-A, p. A1-A10, 2 plates, scale 1:250,000 and 1:500,000.
Koschmann, A.H., and Bergendahl, M.H., 1968, Principal gold producing districts of the United States: U.S. Geological Survey Professional Paper 610, 283 p.
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.
Mertie, J.B., Jr., 1919, Platinum-bearing gold placers of the Kahiltna Valley, in Martin, G.C., and others, Mineral resources of Alaska, report on progress of investigations in 1917: U.S. Geological Survey Bulletin 692, p. 233-264.
Mertie, J.B., Jr., 1969, Economic geology of platinum minerals: U.S. Geological Survey Professional Paper 630, 120 p.
Reed, B.L., and Nelson, S.W., 1980, Geologic map of the Talkeetna quadrangle: U.S. Geological Survey Miscellaneous Investigations Map I-1174, 1 sheet, scale 1:250,000.
Reed, B.L., Nelson, S.W., Curtin, G.C., and Singer, D.A., 1978, Mineral resources map of the Talkeetna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-870-D, 1 sheet, scale 1:250,000.
Robinson, G. D., Wedow, Helmuth, Jr., and Lyon, J. B., 1955, Radioactivity investigations in the Cache Creek area, Yentna district, Alaska 1945: U.S. Geological Survey Bulletin 1024-A, p. 1-23.
Smith, P.S., 1930, Mineral industry of Alaska in 1927 and Administrative Report: U.S. Geological Survey Bulletin 810-A, p. 1-64.
Smith, P.S., 1932, Mineral industry of Alaska in 1929, in Smith, P.S., and others Mineral resources of Alaska, report on progress of investigations in 1929: U.S. Geological Survey Bulletin 824-A, p. 1-81.
|Reporters||Madelyn A. Millholland (Millholland & Associates)|
|Last report date||8/10/1998|