|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. 42.-B(3)) show this placer prospect on Bear Creek, approximately 1.3 miles below confluence of the headwater tributaries, as unpatented placer claims extending from this point to confluence of Bear Creek and Tokositna River. Also shown by Reed and others (1978) as locality 89. This record also includes mineral occurrence at locality 44 of Reed and others (1978) on Bear Creek, below confluence with Wildhorse Creek. Location given here is near the center of the placer.|
Bench placer of Pleistocene (and older?) unconsolidated sediments (Smith, 1930) overlie bedrock of Mesozoic graywacke and argillite (KJs, Reed and Nelson, 1980). Hydrothermal alteration of the bedrock at head of creek is reported by Hawley C.C. and Associates, Inc. (1978). Hawley and Clark (1973, Plate 1) show the Dutch Creek lineament extending down Bear Creek. This feature represents one of the steeply dipping normal faults that Hawley and Clark (1973) suggest are controlling features for placer gold in the Yentna district. Reed and others (1978) report post-1970 mining activity on Bear Creek.Reed and others (1978) indicate that hydrothermally altered zones similar to those at the headwaters of Bear Creek are observed along Dollar (TL031) and Thunder Creeks (TL032, TL058), at the headwaters of Treasure (TL030) and Dutch (TL033) Creeks and at an unnamed locality east of McDoel Peak (TL053).
|Geologic map unit||(-150.942291595055, 62.6294794511399)|
|Mineral deposit model||Placer Au-PGE (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Pleistocene.|
|Alteration of deposit||Hydrothermal alteration is reported by C. C. Hawley and Associates, Inc. (1978) at this site. No detailed description of alteration mineralogy is given.|
|Workings or exploration||The drainage has been prospected and mined by various surface methods including hand mining and dozer/sluice operations. Reed and others (1978) reported post-1970 mining activity. Current status is unknown.|
|Indication of production||Yes; small|
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.
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.
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.
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.
|Reporters||Madelyn A. Millholland (Millholland & Associates)|
|Last report date||8/10/1998|