Stemwinder Occurrence, Aleutians East Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Stemwinder Occurrence | Occurrence |
| Aleutians East Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
55° 19' 40'' North , 160° 34' 29'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Sand Point | 1,064 (2017) | 4.9km |
This occurrence is located on land patented by, or interim-conveyed to, the Aleut Corporation.
Location: This occurrence is on Unga Island approximately 4,000 feet east of Coal Harbor. The map site is at an elevation of 200 feet, 0.25 mile east-southeast of the top of hill 358, in the SW1/4 of sec. 14, T. 56 S., R. 74 W., Seward Meridian.The location is accurate to within 1,200 feet.
Geology: This site consists of a 200-foot long, northwest-trending quartz-pyrite stockwork. The stockwork comprises quartz veins 0.5 to 6 inches thick that contain pyrite laminations and clots. The host rock is argillically altered andesite mapped as Eocene to Oligocene Popof volcanic rocks (Wilson and others, 1995). Of 19 rock samples, two contained gold (0.04 and 0.22 ppm) and three contained mercury (0.15 to 1.55 ppm). Pan samples contained as much as 1.2 ppm gold (Ellis, 1988).
Workings: In 1988 Battle Mountain Exploration Company examined this site and collected 19 rock, 32 soil, and 12 pan samples. Only two rock samples contained anomalous gold values (0.04 and 0.22 ppm).
Age: Eocene or younger.
Alteration: The host rock exhibits argillic alteration.
Commodities (Major) - Au; (Minor) - As, Hg
Development Status: None
Deposit Model: Epithermal gold veins
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 | |||
|---|---|---|---|
| ⓘ | Native 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 | ⓘ Native Gold | Au |
Other Databases
| Link to USGS - Alaska: | PM048 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Chugach DomainAccretionary Complex
- East Aleutian ArcVolcanic Arc
USA
- Alaska
- Alaska Peninsula Mining DistrictMining District
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