Unnamed Occurrence (ARDF - ID149; southeast of summit of Granite Mountain), Iditarod Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
62° 18' 40'' North , 156° 42' 10'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is on the southeast slope of Granite Mountain at an elevation of about 1,600 feet. It is about 0.9 mile south-southeast of peak 2923, the top of Granite Mountain, and about 0.2 mile south of the center of section 28, T. 26 N., R. 40 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence consists of a hematite-bearing, breccia zone of unknown size and orientation in shale and sandstone of the Upper Cretaceous Kuskokwim Group. It is about a mile southeast of the edge of the Granite Mountain pluton (Miller and Bundtzen, 1994; Bundtzen and Miller, 1997, and Bundtzen, Miller, and Gray, 2004). A grab sample of mineralization contained 450 parts per million (ppm) zinc, more than 10 ppm mercury, 400 ppm arsenic, 7.0 ppm bismuth, 22 ppm antimony, and 15.00 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).
Age: Unknown; the nearby Granite Mountain pluton has a 40K/40Ar age of 62.6 Ma Bundtzen and Miller, 1997).
Alteration: Hematite.
Commodities (Major) - As, Bi, Zn; (Minor) - Fe, Hg, Sb
Development Status: None
Deposit Model: Polymetallic vein (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:
| ⓘ Hematite Formula: Fe2O3 |
| ⓘ 'Limonite' |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
| Unclassified | |||
| ⓘ | 'Limonite' | - | |
Other Databases
| Link to USGS - Alaska: | ID149 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell buried DomainDomain
- Farewell TerranePassive Margin
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