Unnamed Prospect (ARDF - ID062; north of upper South Fork; Otter Creek), Iditarod Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
62° 32' 55'' North , 157° 36' 3'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This prospect is at an elevation of about 1,700 feet in a saddle on an irregular-shaped ridge between the head of the Dishna River and the head of the North Fork of Otter Creek. The prospect is about 1.1 mile north of hill 1861 and 1.4 mile west of hill 2208 and near the center of the N1/2 section 3, T. 28 N., R. 45 W., of the Seward Meridian. The location is accurate.
Geology: This prospect is in an area of pronounced gossan development associated with silica-carbonate-altered mafic dikes that cut sandstone of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). Several prospect pits explored three pods of iron oxide gossan. The total length of gossan is about 160 feet. Grab samples of gossan contain up to 340 parts per billion (ppb) mercury, 60 parts per million (ppm) arsenic, 100 ppm copper, and a trace of silver (McGimsey and others, 1988).
Workings: Surface samples were collected by the Alaska Division of Geological and Geophysical Surveys and the U.S. Geological Survey in 1986 (McGimsey and others, 1988).
Alteration: Silica-carbonate alteration of mafic dikes.
Commodities (Major) - Cu; (Minor) - As, Hg
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
1 valid mineral.
Detailed Mineral List:
| ⓘ 'Limonite' |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Unclassified | |||
| ⓘ | 'Limonite' | - | |
Other Databases
| Link to USGS - Alaska: | ID062 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Angayucham TerraneAccretionary Complex
- Farewell buried DomainDomain
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