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Lake Aleknagik Occurrence, Bristol Bay Region Mining District, Dillingham Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Lake Aleknagik Occurrence | Occurrence |
| Bristol Bay Region Mining District | Mining District |
| Dillingham Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
59° 16' 48'' North , 158° 42' 0'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Aleknagik | 226 (2017) | 4.7km |
| Dillingham | 2,404 (2017) | 30.1km |
| Manokotak | 456 (2017) | 39.0km |
Location: This location represents an area of occurences on the southwest shore of Lake Aleknagik. The site chosen to represent these occurrences is the mouth of Yako Creek, about 3 miles west of the village of Aleknagik.
Geology: Eakin (1968) completed a reconnaissance stream-sediment geochemical survey of the Wood River-Tikchik Lakes region. These samples were analyzed for their Cu, Pb, Zn, Mo, and Hg content. In general, there are few anomalous sample results for base metals and molybdenum. However, Eakins' results showed many areas of high mercury levels. Of these, the southern Lake Aleknagik area contains the highest concentration of samples with anomalous mercury contents. For example, six samples along the southeast side of lower Lake Aleknagik were reported to contain greater than 250 ppb Hg, including one with greater than 2,500 ppb Hg. Eakin (1968) cautioned that the analytical technique used for his mercury determinations had potential pitfalls. However, field tests showed the expected anomalous mercury results in areas of known cinnabar deposits (Red Top mine, DI002), and follow-up geochemical studies (Eakin, 1969) roughly duplicated the earlier anomalous mercury results. The Red Top mercury mine (DI002), on Marsh Mountain, is 6 miles east of this location. Although the analytical technique available to Eakin (1968) had its problems, it appears that elevated mercury levels do exist in several areas, especially around the southern end of Lake Aleknagik. Bedrock in the area is mostly interbedded, very fine- to very coarse-grained graywacke, calcareous graywacke, and siltstone. These rocks are probably correlative with Jurassic clastic sedimentary rocks like those in the southeast part of the Hagemeister Island quadrangle (Jk unit of Hoare and Coonrad, 1978; Decker and others, 1994, fig. 1).
Age: Cretaceous or Tertiary. Epigenetic mercury deposits in this region developed after Mesozoic clastic rocks of the area had been deformed and intruded by Cretaceous or Tertiary granitic plutons.
Commodities (Major) - Hg
Development Status: None
Commodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.List of minerals for each chemical element
Other Databases
| Link to USGS - Alaska: | DI008 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Peninsular TerraneVolcanic Arc
- Walrus-Togiak DomainDomain
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