Unnamed Occurrence (ARDF - SM076; south of lake 780), Aniak Mining District, Bethel Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - SM076; south of lake 780) | - not defined - |
| Aniak Mining District | Mining District |
| Bethel Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
61° 2' 43'' North , 156° 1' 1'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is near the top of the isolated knob, hill 1333, about 0.7 mile south-southeast of lake 780. The occurrence is about 0.4 mile east-northwest of the center of section 16, T. 11 N., R. 38 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence is a zone of hematite-rich quartz veins in fine-grained hornfels derived from what has been mapped as the Upper Cretaceous Kuskokwim Group (Cady and others, 1955; LePain and others, 2000). The protolith might also be the Kahiltna assemblage (Wilson and others, 1998). A high level, aphanitic rhyolite intrusive body underlies the hornfels (M. L. Miller, unpublished field data, 1999). Hematite locally makes up a large percentage of the quartz vein. Three grab samples collected of the hematite-rich quartz vein contained up to 2.88 parts per million (ppm) cadmium, 795 ppm zinc, and 14.5 ppm tungsten (M. L. Miller, unpublished analytical data, 1999).
Workings: The U.S. Geological Survey sampled the site in 1999.
Age: Unknown. The rhyolite body under this occurrence has a 40Ar/39Ar age of 67 Ma (R. Wilson, oral communication, 2003).
Alteration: Hematite replacement in hornfels.
Commodities (Major) - Zn; (Minor) - Cd, W
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:
| ⓘ Hematite Formula: Fe2O3 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ 'Tourmaline' Formula: AD3G6 (T6O18)(BO3)3X3Z |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Unclassified | |||
| ⓘ | 'Tourmaline' | - | AD3G6 (T6O18)(BO3)3X3Z |
List of minerals for each chemical element
| B | Boron | |
|---|---|---|
| B | ⓘ Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
| O | Oxygen | |
| O | ⓘ Hematite | Fe2O3 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Fe | Iron | |
| Fe | ⓘ Hematite | Fe2O3 |
Other Databases
| Link to USGS - Alaska: | SM076 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell-McGrath DomainDomain
- Farewell TerranePassive Margin
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