Pass Lake West occurrence, Bristol Bay Mining District, Lake and Peninsula Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Pass Lake West 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° 24' 35'' North , 154° 33' 0'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Port Alsworth | 159 (2017) | 26.4km |
| Nondalton | 157 (2017) | 51.2km |
Mindat Locality ID:
199319
Long-form identifier:
mindat:1:2:199319:9
GUID (UUID V4):
a6a359ea-4f7a-4357-aca1-2fab8914d761
Location: An extensive arcuate shaped occurrence centered approximately at a point 8 km upstream from the mouth of an unnamed northwest flowing tributary of the Koksetna River. The occurrence extends roughly 6.5 km northwest and 8 km south of this location and is about 2.9 km wide. Locality 15 of Nelson and others (1985) and locality 23 of MacKevitt and Holloway (1977). Sec. 30, T4N, R30W, Seward Meridian. Locality accurate within 1.6 km. Site is in Lake Clark National Park and Preserve.
Geology: Weak geochemical anomalies associated with granite and rhyolite that may include breccia pipes. Granite is less fractured and iron-stained than rhyolite (Nelson and others, 1985). The granite is part of the numerous, mostly quartz monzonite intrusive bodies found in the central part of the Lake Clark 1:250,000 scale quadrangle mapped and identified by Eakins and others (1978); (Nelson and others, 1983; unit TKi5). One of these plutons yielded a potassium-argon biotite age of 71.3 +/- 2.1 m.y. (Eakins and others, 1978). The rhyolite is part of unit Tv. Unit Tv is described by Nelson and others (1983) to include: rhyolitic breccia, ash-flow tuff, flows, and intrusive rocks and subordinate mafic to intermediate flows. Potassium-argon ages for this unit (Tv) range from 56.2 to 62.7 m.y. indicating a Tertiary age for these rocks (Eakins and others, 1978).
Workings: Unknown, although Resource Associates of Alaska (1976) completed a sampling program that identified the occurrence.
Age: Late Cretaceous or younger. Rocks of the quartz monzonite unit yielded a potassium-argon biotite age of 71.3 +/- 2.1 m.y. (Eakins and others, 1978). Potassium-argon ages for the rhyolite, unit Tv, range from 56.2 to 62.7 m.y. (Eakins and others, 1978)
Alteration: Unknown
Production: No production
Reserves: No reserves
Commodities (Major) - Ag, Cu; (Minor) - Mo, Zn
Development Status: None
Deposit Model: Porphyry Cu - Mo ? (Cox and Singer, 1986; model 21a ?)
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: | LC025 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
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References
