Cascade Prospect, Chichagof Mining District (Chicagof Mining District), Sitka, Alaska, USAi
| Regional Level Types | |
|---|---|
| Cascade Prospect | Prospect |
| Chichagof Mining District (Chicagof Mining District) | Mining District |
| Sitka | City Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
57° 4' 23'' North , 135° 16' 4'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Sitka | 8,863 (2017) | 4.4km |
Location: The Cascade prospect is at an elevation of about 1,000 feet on the ridge just southwest of Billy Basin. The prospect is 0.2 mile northeast of the center of sec. 29, T. 55 S., R. 64 E. It is location P-114 of Bittenbender and others (1999); location 54 of Cobb (1972, 1978); and MAS no. 0021140021 (U.S. Bureau of Land Management, 2002). The location is accurate within 0.5 mile.
Geology: The rocks in the vicinity of the Cascade prospect consist of Jurassic and Triassic, amphibolite and greenschist surrounded by rocks of the Jurassic and Triassic, Khaz Formation which consists of graywacke, greenschist, metachert, phyllite, and minor limestone (Loney and others, 1975). As originally described by Knopf (1912), the Cascade prospect consists of shattered quartzite cemented by quartz veinlets with pyrrhotite, arsenopyrite, and rare chalcopyrite. Cobb (1978) infers gold in the deposit. There has apparently been little work on the deposit since before 1912 and while Bittenbender and other (1999) show the prospect on a location map, they do not mention it otherwise.
Workings: Apparently only surface sampling.
Age: Triassic or younger based on the age of the host rocks.
Commodities (Major) - As, Au?, Cu, Fe
Development Status: None
Deposit Model: Shattered quartzite with pyrrhotite, arsenopyrite, and chalcopyrite.
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:
| ⓘ Arsenopyrite Formula: FeAsS |
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Pyrrhotite Formula: Fe1-xS |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
| ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
| 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 | ⓘ Arsenopyrite | FeAsS |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Pyrrhotite | Fe1-xS |
| Fe | Iron | |
| Fe | ⓘ Arsenopyrite | FeAsS |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrrhotite | Fe1-xS |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| As | Arsenic | |
| As | ⓘ Arsenopyrite | FeAsS |
Other Databases
| Link to USGS - Alaska: | SI175 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Chugach DomainAccretionary Complex
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