Neptune Occurrences, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Neptune Occurrences | Group of Occurrences |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 16' 48'' North , 153° 38' 24'' West
Latitude & Longitude (decimal):
Type:
Group of Occurrences
Köppen climate type:
Location: The Neptune occurrences are located in an unnamed east-flowing tributary of Post River, at an elevation of 3,100 feet near the center of sec. 1, T. 25 N., R. 24 W., of the Seward Meridian. The location of the occurrences is derived from a rough sketch map made by Anaconda Minerals Company in 1981, and is considered to be accurate to within about one half kilometer.
Geology: The Neptune occurrences are a small cluster of unexplained but highly anomalous lead, zinc, and silver values (values unstated) in an area capped by the Late Cretaceous, Veleska Lake Volcanic field (Bundtzen, Harris, and Gilbert, 1997). Scattered occurrences of galena and sphalerite in fault-controlled quartz veins may be the source of these anomalies (Brewer and others, 1992).
Workings: The Neptune occurrences were found by the Anaconda Minerals Company in 1980 or 1981 (Brewer and others, 1992). High lead, zinc, and silver anomalies (unstated values) may be derived from galena-sphalerite quartz veins in the area, but more work is recommended.
Age: Unknown; may be related to Late Cretaceous, Veleska Lake Volcanic Field (Bundtzen, Harris, and Gilbert, 1997).
Reserves: None.
Commodities (Major) - Pb, Zn; (Minor) - Ag
Development Status: None
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
2 valid minerals.
Detailed Mineral List:
| ⓘ Galena Formula: PbS |
| ⓘ Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Galena | 2.CD.10 | PbS |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Galena | PbS |
| S | ⓘ Sphalerite | ZnS |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS - Alaska: | MG090 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell-McGrath DomainDomain
- Farewell TerranePassive Margin
USA
- Alaska
- Yukon-Koyukuk Census Area
- McGrath Mining DistrictMining District
- Yukon-Koyukuk Census Area
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