Unnamed Occurrence (ARDF - SI119; northeast of Ford Arm), Chichagof Mining District (Chicagof Mining District), Sitka, Alaska, USAi
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Latitude & Longitude (WGS84):
57° 37' 18'' North , 135° 51' 57'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Hoonah | 757 (2017) | 59.7km |
Location: This occurrence is at an elevation of about 1,500 feet northeast of Ford Arm, about midway between lakes 920 and 423. The occurrence is about 0.2 mile north-northeast of the center of sec. 13, T. 49 S., R. 59 E. It is location 41 of Cobb (1972, 1978). The location probably is accurate within 0.2 mile.
Geology: Johnson and Karl (1985) map the rocks in the area of this occurrence as Triassic(?) greenstone that is intruded by a stock of Cretaceous or Jurassic gabbro and by a northwest-striking, linear sill(s) of Cretaceous(?) diorite. The rocks are cut by steeply-dipping, mainly northwest-striking faults, including the regional-scale Border Ranges Fault, whose trace is about 0.5 mile southwest of the occurrence. The fault apparently is intruded by the sill(s). Cobb (1972, 1978), citing Loney and others (1963), describes this occurrence as chalcopyrite, pyrite, and secondary copper minerals in amygdaloidal basalt. The primary sulfides probably are about the same age as the Triassic(?) greenstone host rock.
Age: The primary copper mineralization probably is Triassic(?), the age of the greenstone host rock.
Commodities (Major) - Cu
Development Status: None
Deposit Model: Basaltic copper (Cox and Singer, 1986; model 23).
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:
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Pyrite Formula: FeS2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Databases
| Link to USGS - Alaska: | SI119 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Chugach DomainAccretionary Complex
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