|Quadrangle map, 1:250,000-scale||MM|
|Quadrangle map, 1:63,360-scale||C-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Crevice Creek (Cobb, 1980 [OFR 80-363]) is a two-mile-long, northwest-flowing tributary to Caribou Creek. It rises below Spuce Peak. For this record, the location of the Crevice Creek placer is near the center of section 24, T. 15 S., R. 16 W., Fairbanks Meridian. Crevice Creek is location 54 of Cobb (1972 [MF 366]). It is Alaska Kardex location 66-58 (Heiner and Porter, 1972; Hawley and Associates, 1978), and is resource block CR-1 of Thornsberry, McKee, and Salisbury (1984, fig. K-3).|
Crevice Creek is steep, having a gradient of more than 500 feet per mile. It flows in a bedrock valley on Birch Creek Schist. Its steep upper valley is cut into rocks of the Spruce Creek sequence, and a regional fault that strikes northwest controls its upper course (Thornsberry, McKee, and Salisbury, 1984, fig. K-2; Bundtzen, 1981). Several lode mineral occurrences, including MM053 and MM057, are in the headwaters of Crevice Creek (Hawley and Associates, 1978, fig. 4.1-A(1)).The creek was mined by hand in the early 1900s. Rough, coarse gold was recovered, including a 4 or 5 ounce nugget (Prindle, 1907). About one-third of the creek appears to have been hand mined, and there appears to have been some mining as recently as 1946-47 (Levell, 1984, v. 2, table A-6). Test samples 0.1 cubic yard in size collected in 1983 contained 0.0018 to 0.1249 ounce of gold per cubic yard (Levell, 1984, v. 2). There is a resource of about 100,000 cubic yards of alluvial gravel in the valley that could contain placer gold.
|Geologic map unit||(-150.758187679229, 63.6008980751765)|
|Mineral deposit model||Au-PGE placer deposit (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Holocene.|
|Workings or exploration||Placer gold was discovered in Crevice Creek early in the history of the Kantishna district. It was mined fairly extensively by hand in 1906, and some mining could have occurred as recently as 1946 and 1947.|
|Indication of production||Yes; small|
|Reserve estimates||About 100,000 cubic yards of alluvium that could grade about 0.03 to 0.1 ounce of gold per cubic yard (Levell, 1984, v. 2).|
|Production notes||Probable production of 500 to 750 ounces of gold (Levell, 1984, v. 2; Cobb, 1980 [OFR 80-363]).|
Additional commentsCrevice Creek is in Denali National Park and Preserve.
Bundtzen, T.K., 1981, Geology and mineral deposits of the Kantishna Hills, Mt. McKinley quadrangle, Alaska: M. S. Thesis, University of Alaska, College, Alaska, 238 p.
Cobb, E. H., 1972, Metallic mineral resources map of the Mount McKinley quadrangle, Alaska: U. S. Geological Survey Miscellaneous Field Studies Map MF-366, 1 sheet, scale 1:250,000.
Cobb, E.H., 1980, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Mount McKinley quadrangle, Alaska: U. S. Geological Survey Open-File Report 80-363, 150 p.
Cox, D.P., and Singer, D.A., eds., 1986, Mineral deposit models: U.S. Geological Survey Bulletin 1693, 379 p.
Hawley, C. C. 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, 275 p. (paged by sections).
Heiner, L.E., and Porter, Eve, 1972, Alaska Mineral Properties, volume 2: University of Alaska, Mineral Industry Research Laboratory Report 24, 669 p.
Levell, J. H., 1984, Appendix A, Placer, in 1983 Mineral Resource Studies: Kantishna Hills and Dunkle mine areas, Denali National Park and Preserve, Alaska: U. S. Bureau of Mines Open-File Report 129-84, Vol. 2, p. 1-219.
Prindle, L.M., 1907, The Bonnifield and Kantishna regions, Alaska: U.S. Geological Survey Bulletin 314-L, p. 205-226.
Thornsberry, V. V., McKee, C. J., and Salisbury, W. G., eds, 1984, 1983 Mineral Resource Studies: Kantishna Hills and Dunkle Mine Areas, Denali National Park and Preserve, Alaska: U. S. Bureau of Mines Open-File Report 129-84. 3 Volumes: v. 1, Text; v. 2, Appendices; v. 3, Maps. Prepared by Salisbury & Dietz, Inc., Spokane, WA.
|Last report date||4/19/2001|