Dennys Gulch; O'Keefe Mine, Chandalar District, Yukon-Koyukuk Borough, Alaska, USA
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Location: This property is at an elevation of about 3,400 ft on the northeast side of the O'Keefe Hills (SE1/4 sec. 29, T. 30 N., R. 7 W., of the Fairbanks Meridian); it is approximately 18 1/2 miles southwest of Chandalar. The reference point coincides with the mine symbol on Dennys Gulch shown on the topographic map. The location is accurate within a 1/2-mile radius.
Geology: This area was not described by early workers, which suggests that the discovery of placer gold was considerably later than that in many other parts of the district. There are reports of active placer mining on this creek as late as the 1960s but little information after that. Heiner and Wolff (1968) reported that placer gold has been mined from gravels that range in thickness from 6 to 70 ft and that coarse nuggets (valued at as much as $100) have been recovered, although no pay streak was delineated. Bedrock is mapped as quartz-muscovite schist that is highly deformed and cut by many thin quartz veins that contain pyrite (Freeman, 1963). Brosg
Workings: Placer mining reported as late as 1964 (Brosg
Age: Quaternary.
Commodities (Major) - Au
Development Status: Yes
Deposit Model: Placer Au (Cox and Singer, 1986; model 39a)
Mineral List
1 entry listed. 1 valid mineral.
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References
Anderson, E., 1944, Petrographic descriptions of rocks collected during 1944 field investigation in north-west Alaska, and lists of ore and rock samples and placer concentrates collected in northwestern and interior Alaska during 1945 field season: Alaska Territorial Department of Mines Miscellaneous Report 195-28, 76 p. Brosg