Unnamed Occurrence (ARDF - ID142; southwest flank of Granite Mountain), Iditarod Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
62° 17' 41'' North , 156° 49' 4'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is on the southwest end of Granite Mountain at an elevation of about 1,200 feet. It is about 1.1 mile southwest of hill 1640 and 0.5 mile southeast of the center of section 35, T. 26 N., R. 41 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence is heavily iron-oxide-stained sandstone with semi-massive pyrrhotite lenses an inch or so thick. The sandstone is part of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). One grab sample contained 390 parts per million (ppm) antimony, 850 ppm arsenic, 900 parts per billion mercury, and more than 20.00 percent iron (McGimsey and others, 1988).
Workings: Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in 1986 (McGimsey and others, 1988).
Alteration: Iron oxide alteration.
Commodities (Major) - As, Sb; (Minor) - Fe, Hg
Development Status: None
Deposit Model: Polymetallic veins? (Cox and Singer, 1986; model 22c).
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:
| ⓘ 'Limonite' |
| ⓘ Pyrrhotite Formula: Fe1-xS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
| Unclassified | |||
| ⓘ | 'Limonite' | - | |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Pyrrhotite | Fe1-xS |
| Fe | Iron | |
| Fe | ⓘ Pyrrhotite | Fe1-xS |
Other Databases
| Link to USGS - Alaska: | ID142 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell buried DomainDomain
- Farewell TerranePassive Margin
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