Washington Prospect, Ketchikan Gateway Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Washington Prospect | Prospect |
| Ketchikan Gateway Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
55° 9' 3'' North , 131° 45' 39'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Metlakatla | 1,405 (2017) | 12.1km |
| Saxman | 417 (2017) | 21.4km |
| Ketchikan | 8,197 (2017) | 22.4km |
Location: The Washington prospect is at an elevation of less than 100 feet, about 0.2 mile northwest of the southwest head of Dall Bay, and about 0.1 mile from tidewater. The site is in section 31, T. 77 S., R. 91 E., of the Copper River Meridian. It corresponds to loc. 127 in Elliott and others (1978), and to loc. 317 in Maas and others (1995). The location is accurate within 0.1 mile.
Geology: The country rocks in the area of this prospect consist of an assemblage of undivided Silurian or Ordovician metamorphosed bedded and intrusive rocks that are intruded by stocks and dikes of Silurian trondhjemite (Berg, 1973; Berg and others, 1988), The rocks are cut by a complex system of high-angle faults that mainly strike NE and NW. Locally, they also are permeated by finely disseminated hydrothermal hematite, giving them (especially the trondhjemite) a pink or red hue commonly mistaken for potassium feldspar. According to Elliott and others (1978), the deposit consists of a mineralized zone along a sheared and brecciated contact between diabase and pegmatite (hydrothermally altered trondhjemite?). Pyrite and chalcopyrite occur in the zone, accompanied by quartz and jasper gangue. The deposit was explored in the early 1900s by a 20-foot drift or adit (Brooks, 1902, p. 72; Maas and others, 1995, p. 229). Similarities in character and setting of the Washington deposit to those of other lodes in the Dall Bay area (see, for example, KC 131, 132) suggest that it is a polymetallic vein of Late Triassic or younger age.
Workings: The deposit was explored in the early 1900s by a 20-foot drift or adit (Brooks, 1902, p. 72; Maas and others, 1995, p. 229).
Age: Late Triassic or younger.
Alteration: Probably local silicification, carbonatization, pyritization, and introduction of hydrothermal hematite.
Commodities (Major) - Cu
Development Status: Undetermined.
Deposit Model: Polymetallic veins (Cox and Singer, 1986; model 22c)
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Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
3 valid minerals.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
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Alphabetical List Tree DiagramGallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | 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 | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Databases
| Link to USGS - Alaska: | KC130 |
|---|
Other Regions, Features and Areas containing this locality
North America
- Coast MountainsMountain Range
North America PlateTectonic Plate
- Alexander DomainDomain
- Alexander TerraneVolcanic Arc
USA
- Alaska
- Ketchikan Mining DistrictMining District
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