Unnamed Occurrence (ARDF - SI178; east of Arrowhead Peak), Chichagof Mining District (Chicagof Mining District), Sitka, Alaska, USAi
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Latitude & Longitude (WGS84):
57° 4' 8'' North , 135° 12' 25'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Sitka | 8,863 (2017) | 7.7km |
Location: This occurrence is near elevation 2245 at the east end of the east spur of Arrowhead Peak. The occurrence is in the NE1/4SE1/4 sec. 27, T. 55 S., R. 64 E. It location 56 of Cobb (1972, 1978). The location probably is accurate within about 0.2 mile.
Geology: This occurrence is near the contact of two similar units of Jurassic and Triassic age (Loney and others, 1975). The Khaz Formation consists of graywacke, greenschist, metachert, phyllite, and minor limestone. The Kelp Bay Group consists of quartzite, greenschist, greenstone, graywacke and semischist, all of which are subject to intense cataclasis. The occurrence consists of magnetite and chromite in serpentine, which probably are small fault blocks or slivers (Loney and others, 1963). The serpentinite body is too small to be shown on the geologic map of Loney and other (1975). There is no indication that the occurrence is any more than accessory minerals in a small serpentinite body. Samples of diabase or greenstone collected by Loney and others (1963) show small amounts of chromium, nickel, copper, cobalt, and zinc that are little if any above normal background in these types of rocks.
Workings: Only surface sampling.
Age: Triassic or younger based on the age of the rocks in the area.
Commodities (Major) - Cr, Fe
Development Status: None
Deposit Model: Accessory magnetite and chromite in serpentine.
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.
Detailed Mineral List:
| ⓘ Chromite Formula: Fe2+Cr3+2O4 |
| ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
| ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| Unclassified | |||
| ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| O | Oxygen | |
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| O | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| Si | Silicon | |
| Si | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
Other Databases
| Link to USGS - Alaska: | SI178 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Chugach DomainAccretionary Complex
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