Unnamed Occurrence (ARDF - SI157; southwest shore of Portage Arm), Chichagof Mining District (Chicagof Mining District), Sitka, Alaska, USAi
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Latitude & Longitude (WGS84):
57° 21' 9'' North , 134° 56' 23'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Angoon | 456 (2017) | 27.1km |
| Sitka | 8,863 (2017) | 40.8km |
| Tenakee Springs | 133 (2017) | 50.4km |
Location: This occurrence on northeast Baranof Island is at sea level on the southwest shore of Portage Arm. The occurrence is 0.2 mile northeast of the center of sec. 23, T. 52 S., R. 65 E. It is location 60 of Cobb (1972, 1978). Several of the old publications include this with the Brown prospect which is on Admiralty Island some distance away (SI163). The location probably is accurate within 0.2 mile.
Geology: The rocks in the vicinity of this occurrence are part of the Jurassic and/or Triassic, Kelp Bay Group which consists of phyllite, quartzite greenschist, greenstone, graywacke, and semischist.( Loney and others, 1975). There is little information on this occurrence other than that it consists of quartz veins and siliceous rocks that contain chalcopyrite, covellite, and bornite. (Loney and others, 1963).
Workings: Only limited surface sampling by government geologists.
Age: Triassic or younger based on the age of the host rock.
Commodities (Major) - Cu
Development Status: None
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
4 valid minerals.
Detailed Mineral List:
| ⓘ Bornite Formula: Cu5FeS4 |
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Covellite Formula: CuS |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Bornite | 2.BA.15 | Cu5FeS4 |
| ⓘ | Covellite | 2.CA.05a | CuS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| 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 | ⓘ Bornite | Cu5FeS4 |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Covellite | CuS |
| Fe | Iron | |
| Fe | ⓘ Bornite | Cu5FeS4 |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Cu | Copper | |
| Cu | ⓘ Bornite | Cu5FeS4 |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Cu | ⓘ Covellite | CuS |
Other Databases
| Link to USGS - Alaska: | SI157 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Alexander DomainDomain
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