Amaknak Island Occurrence, Aleutians Mining District, Aleutians West Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Amaknak Island Occurrence | Occurrence |
| Aleutians Mining District | Mining District |
| Aleutians West Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
53° 53' 5'' North , 166° 32' 52'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Dutch Harbor | 4,376 (2018) | 0.6km |
| Unalaska | 4,491 (2017) | 1.5km |
Commodities (Major) - Au
Development Status: No
Deposit Model: Epithermal gold vein
This and other undescribed occurrences were apparently reported to Drewes (Drewes and others, 1961) by someone named Eakle on the basis of local reports.
Location: Locality is 1.6 km south of Dutch Harbor airport on Amaknak Island and corresponds to locality 1 of Cobb (1972, MF-446); it is accurate to about 400 m. It also is anomaly no. 27 of Christie (1974).
Geology: Christie (1974) reported a color anomaly caused by the oxidation of disseminated pyrite in volcanic breccia of the Unalaska Formation (see Drewes and others, 1961) cut by small swarms of feldspar porphyry andesite and hornblende-biotite porphyry basalt (lamprophyre) dikes. Dikes are oriented 010o dipping 80o E. The dikes are weakly mineralized, however small vuggy quartz veins occur adjacent to some dikes. Fracturing in the area varies from moderate to intense. At least one of these quartz veins was gold-bearing on the basis of a report in Drewes and others (1961).
Workings: Brief reconnaissance mapping and sampling reported by Christie (1974); however, in 1992 the entire ridge was being quarried for riprap and fill and being removed for commercial port development (F.H. Wilson, unpublished data, 1992).
Age: Miocene or younger.
Alteration: Rocks are regionally propylitically altered or metamorphosed to low-grade. Area of locality is highly iron-stained. Christie (1974) reported the alteration assemblage of epidote-chlorite-kaolinite-pyrite accompanied by moderate to intense leaching.
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
3 valid minerals.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| 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 |
| Au | Gold | |
| Au | ⓘ Gold | Au |
Other Databases
| Link to USGS - Alaska: | UN001 |
|---|
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