Unnamed Occurrence (ARDF - KC051; east of Swan Lake), Ketchikan Gateway Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - KC051; east of Swan Lake) | - not defined - |
| Ketchikan Gateway Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
55° 36' 32'' North , 131° 13' 37'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Saxman | 417 (2017) | 39.8km |
| Ketchikan | 8,197 (2017) | 39.8km |
| Metlakatla | 1,405 (2017) | 57.7km |
Site is on the western boundary of Misty Fiords National Monument Wilderness.
Location: This occurrence is about 2.0 miles east of Swan Lake, on the crest of a north-northeast-trending ridge at an elevation of 3650 feet. The site is on the boundary between sections 19 and 20, T. 72 S., R. 92 E., of the Copper River Meridian. It corresponds to loc. 50.1 in Elliott and others (1978). The location is accurate within 0.1 mile.
Geology: The country rocks near this prospect are pelitic schist and gneiss, and subordinate andesitic and basaltic metavolcanic rocks, that are intruded by Cretaceous stocks, sills, and dikes of feldspar-porphyritic granodiorite, and by small metadiorite plutons of undetermined age (Berg and others, 1988). The strata were regionally metamorphosed to upper greenschist or amphibolite grade in Cretaceous time, and, near some of the granodiorite contacts, subsequently contact metamorphosed to hornblende hornfels. The premetamorphic age range of the strata is unknown. Berg and others (1988, p. 17) assigned them an undivided Mesozoic or Paleozoic age. More recent studies suggest that at least some of the strata may be as old as Precambrian (Crawford and others, 2000). This occurrence consists of sparsely disseminated, minute particles of molybdenite in a rusty-weathering, 45-foot-thick granodiorite(?) sill that intrudes pelitic paragneiss (Elliott and others, 1978). An analysis of the molybdenite-bearing rock showed 150 ppm Mo (Koch and Elliott, 1978 [OFR 78-156A]). The molybdenite may be a late-stage hydrothermal mineral in the granodiorite.
Workings: An analysis of the molybdenite-bearing rock showed 150 ppm Mo (Koch and Elliott, 1978 [OFR 78-156A]).
Age: Cretaceous?
Alteration: Locally conspicuous iron-staining.
Commodities (Major) - Mo
Development Status: None
Deposit Model: Porphyry Mo, low-F? (Cox and Singer, 1986; model 21b)
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.
Detailed Mineral List:
| ⓘ Molybdenite Formula: MoS2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Molybdenite | 2.EA.30 | MoS2 |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Molybdenite | MoS2 |
| Mo | Molybdenum | |
| Mo | ⓘ Molybdenite | MoS2 |
Other Databases
| Link to USGS - Alaska: | KC051 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Coast MountainsMountain Range
North America PlateTectonic Plate
- Taku DomainDomain
- Yukon-TananaVolcanic Arc
USA
- Alaska
- Ketchikan Mining DistrictMining District
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