Unnamed Occurrence (ARDF - EA119; northwest of Purdy Mine), Southeast Fairbanks Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - EA119; northwest of Purdy Mine) | - not defined - |
| Southeast Fairbanks Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
64° 7' 21'' North , 141° 57' 36'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This unnamed occurrence is located at an elevation of about 2,650 feet on the ridgeline between Stonehouse Creek and Myers Fork; It is about 3.4 miles north-northwest of Chicken. The occurrence is in section 18, T. 27 N., R. 18 E., of the Copper River Meridian. The location is accurate.
Geology: The rocks in the vicinity of this occurrence are predominantly granitic rocks of the Chicken pluton of Jurassic age (Werdon and others, 2001). Hornblende from the pluton gives a 40Ar/39Ar plateau age of 187.8 +/-0.9 Ma (Layer and others, 2002). The pluton is intruded by an undated, K-feldspar-porphyritic, biotite hornblende granite that is spatially associated with numerous aplite dikes (Werdon and others, 2001). The southern margin of this granite is brecciated and in high-angle fault contact with upper Paleozoic metasedimentary and metavolcanic rocks. The aplite dikes are commonly sericite-altered. A sample of a quartz-veined aplite dike with a weak iron-oxide stain contains 70 ppb gold, 1.4 ppm silver, 4 ppm bismuth, 74 ppm lead, and 50 ppm zinc (Szumigala and others, 2000).
Age: Jurassic or younger.
Alteration: Aplite dikes are commonly altered to sericite and are locally iron stained.
Commodities (Major) - Au
Development Status: None
Deposit Model: Plutonic-related gold.
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 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| 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 |
| Au | Gold | |
| Au | ⓘ Gold | Au |
Other Databases
| Link to USGS - Alaska: | EA119 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Yukon-TananaVolcanic Arc
- Yukon-Tanana upper DomainDomain
USA
- Alaska
- Fortymile Mining DistrictMining District
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