Reinken, Bornite Lake Prospect, Aleutians Mining District, Aleutians West Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Reinken | Prospect |
| Bornite Lake Prospect | Prospect |
| Aleutians Mining District | Mining District |
| Aleutians West Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
53° 29' 54'' North , 166° 58' 10'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Unalaska | 4,491 (2017) | 50.5km |
| Dutch Harbor | 4,376 (2018) | 51.8km |
Reportedly mined during Russian period. Battle Mountain Exploration Company gave the prospect a poor potential for economic gold mineralization due to remoteness, ruggedness of the environment, and minimal evidence for economic mineralization.
Location:
Three km south of the head of Pumicestone Bay in a lake basin; the lake is locally called Bornite Lake.
Geology:
Quartz veins up to 60 cm wide cut a silicified roche moutonnee immediately north of lake. Roche moutonnee is pervasively silicified and 500 feet wide by 1,500 feet long (150 x 450 m). Up to 30 percent pyrite occurs in veins and silicified rock. Country rock shown in Drewes and others (1961) as Unalaska Formation, about 2 km from mapped southern margin of Shaler batholith (granodiorite).
Workings:
Reported 18th or 19th century mining by Russians. No evidence remains of Russian activity; prospect possibly staked by John and Leon Reinken in 1929. Kennecott-Alaska collected 23 rock samples; Battle Mountain Exploration Co. collected pan concentrates and an additional 9 rock samples. None of BMEC rock samples were anomalous in gold; one contained 4.8 ppm silver, 9,085 ppm copper, and 410 ppb mercury. Pan concentrates contained up to 240 ppb gold and 920 ppm copper.
Age:
Miocene or younger.
Alteration:
Pervasive silicification of country rocks.
Commodities:
(Major) - Cu, Au(?), Ag; (Minor) - Hg
Development Status:
None.
Deposit Model:
Polymetallic vein, 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: | UN008 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Aleutian Trench basinBasin
- East Aleutian ArcVolcanic Arc
Pacific Ocean
- Bering SeaSea
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