Unnamed Occurrence (ARDF - ID093; north of hill 2170), Iditarod Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - ID093; north of hill 2170) | - not defined - |
| Iditarod Mining District | Mining District |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 44' 35'' North , 156° 14' 2'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is at an elevation of about 1,600 feet about 1.0 mile north of hill 2170. It is about 0.3 mile northeast of the southwest corner of section 28, T. 31 N. R. 37 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence is a pyrite-quartz-bearing shear zone about 65 feet thick that occurs at the contact of a small granite porphyry intrusion with biotite hornfels (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The rocks in the vicinity are mainly fine grained intrusive rocks and a large hornfels aureole; this suggests a large underlying intrusive body (Miller and Bundtzen, 1994). The mineralized shear zone can be traced for about a mile to the northeast. Grab samples collected along the zone contain 1,000 parts per million (ppm) mercury (D. Obolewicz, written communication, 1981). Other samples contain up to 500 parts ppm arsenic but no gold (McGimsey and others, 1988).
Workings: The mineralized shear zone was sampled by Anaconda Minerals in 1981 (D. Obolewicz, written communication, 1981 and the U.S. Geological Survey in 1986 (McGimsey and others, 1988).
Age: Unknown; the nearby intrusion is undated (Miller and Bundtzen, 1994).
Alteration: Sericite.
Commodities (Major) - Hg; (Minor) - As
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
2 valid minerals.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
Other Databases
| Link to USGS - Alaska: | ID093 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell buried DomainDomain
- Farewell TerranePassive Margin
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