Thormac Occurrence, Aleutians East Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Thormac Occurrence | Occurrence |
| Aleutians East Borough | Borough |
| Alaska | State |
| USA | Country |
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
55° 16' 48'' North , 160° 35' 56'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Sand Point | 1,064 (2017) | 8.9km |
This site is located on land either selected or patented by, or interim-conveyed to, the Aleut Corporation.
Location: The Thormac occurrence is approximately 1.5 miles southwest of Ben Green Bight on Unga Island (Wilson and others, 1988, locality 42). The map site is at an elevation of about 1,150 feet, in the NE1/4 of sec. 1, T. 57 S., R. 75 W., of the Seward Meridian. The location is accurate to within 1,000 feet.
Geology: This occurrence is a quartz vein system with a strike length of 1,100 feet. Individual veins within the system exceed 3 feet in width. The host rock is andesite of the late Eocene to early Oligocene Popof volcanic rocks (Wilson and others, 1995). The system contains abundant gossanous vugs. There is no indication of base metal sulfides, and the gossans probably reflect oxidation of pyrite. Grab samples contained 0.005 to 0.135 ppm gold, 0.2 to 19.0 ppm silver, as much as 800 ppm arsenic, and 5.0 ppm or more mercury (Peterson and others, 1982).
Workings: In 1982 UNC Teton Exploration Drilling Company explored the occurrence and collected several samples.
Age: Eocene or younger.
Commodities (Major) - Ag, Au; (Minor) - As, Hg
Development Status: None
Deposit Model: Epithermal gold vein
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: | PM055 |
|---|
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
This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to
visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders
for access and that you are aware of all safety precautions necessary.
