Caribou Creek; Koksetna River Prospect, Bristol Bay Mining District, Lake and Peninsula Borough, Alaska, USAi

Regional Level Types
Caribou Creek; Koksetna River Prospect	Prospect
Bristol Bay Mining District	Mining District
Lake and Peninsula Borough	Borough
Alaska	State
USA	Country

Site is in Lake Clark National Park and Preserve.
Location: Locality narrowed down to the SW1/4 of the Lake Clark 1:250,000 map, along the Chulitna River and possibly Koksetna River. Latitude and longitude given is approximate and not specific.
Geology: Martin and Katz (1910; 1912) report fine gold but no pay from the northeasterly tributary to Caribou Creek, from Caribou Creek, and from Koksetna River. The dominant bedrock in the drainage area is a Jurassic to Cretaceous flysch sequence and Tertiary volcanics (Nelson and others, 1983; unit KJs and unit Tv) . Unit KJs is interbedded lithic graywacke, silty sandstone, black shale, and local conglomerate. Irregular quartz segregations and veinlets are locally present. Scattered stocks and locally abundant dikes of intermediate to felsic composition including quartz monzonite, diorite, and granite intrude these sedimentary rocks. Adjacent to some of the larger igneous bodies are narrow contact aureoles of pelitic hornfels. Unit Tv includes rhyolitic breccia, ash-flow tuff, flows, and intrusive rocks and subordinate mafic to intermediate flows. Potassium-argon ages for unit Tv range from 56.2 to 62.7 m.y. (Eakins and others, 1978).
Workings: Unknown, probably only hand-methods used for placer mining operations.
Age: Quaternary.
Alteration: Not applicable
Production: No production
Reserves: No reserves

Commodities (Major) - Au
Development Status: None
Deposit Model: Placer Au (Cox and Singer, 1986; model 39a)

Other Databases

Link to USGS - Alaska:	LC040

Other Regions, Features and Areas containing this locality

References