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Lambert's Bar Occurrence, Bristol Bay Mining District, Lake and Peninsula Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Lambert's Bar Occurrence | Occurrence |
| Bristol Bay Mining District | Mining District |
| Lake and Peninsula Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
60° 35' 23'' North , 155° 23' 23'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
This locality appeared on a map in Cobb (1973). The text did not provide any information about the site. Cobb and Reed (1981) mention gold in most river bars of the Mulchatna River, with most prospecting occurring around the late 1890's or early 1900's.
Location: Occurrence (mine ?) is at the confluence of the Chilikadrotna River with the Mulchatna River. Sec. 22, T. 6 N., R. 35 W., of the Seward Meridian. Accurate within 1.6 km.
Geology: Lambert's Bar is a placer gold occurrence (mine ?) on the Mulchatna River. The most abundant bedrock in the areas upstream of the locality is unit KJs. Nelson and others (1983) described unit KJs as 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 intrude these sedimentary rocks. Adjacent to some of the larger igneous bodies are narrow contact aureoles of pelitic hornfels. Unit KJs is intruded (locally) by various Cretaceous to Tertiary plutons. The plutons include a quartz monzonite. One pluton yielded a potassium-argon age on hornblende of 71.3 +/- 2.1 m.y. (Eakins and others, 1978). Also present is Unit Tv of Nelson and others (1983) which 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. indicating a Tertiary age for these rocks (Eakins and others, 1978).
Workings: Unknown
Age: The placer gold is Quaternary, the source of gold could come from a variety of rocks with diverse ages.
Alteration: Not applicable
Production: Unknown
Reserves: No reserves
Commodities (Major) - Au
Development Status: Undetermined
Deposit Model: Placer Au (Cox and Singer, 1986; model 39a)
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
1 valid mineral.
Gallery:
Other Databases
| Link to USGS - Alaska: | LC020 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Peninsular-Tlikakila DomainDomain
- Peninsular TerraneVolcanic Arc
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