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Unnamed Occurrence (ARDF - KC142), Ham Island, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - KC142) | - not defined - |
| Ham Island | Island |
| Ketchikan Mining District | Mining District |
| Prince of Wales-Hyder Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
55° 10' 51'' North , 131° 22' 4'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Metlakatla | 1,405 (2017) | 14.4km |
| Saxman | 417 (2017) | 21.0km |
| Ketchikan | 8,197 (2017) | 25.2km |
Location: This site consists of three occurrences on the southwest shore of Ham Island, about midway in Cascade Inlet. The 0.2-mile-long strip of shoreline that contains the occurrences is in sections 22 and 23, T. 77 S., R. 93 E., of the Copper River Meridian. The site corresponds to loc. 10 in Berg (1972 [I 684]), loc. 139 in Elliott and others (1978), and loc. 25a-c in Karl (1992). The location is accurate within 0.1 mile.
Geology: The country rocks at this site are Jurassic and Cretaceous flyschlike metasedimentary rocks that grade upward into andesitic or basaltic metavolcanic rocks (Berg, 1972). The rocks were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. The occurrences consist of traces of gold in quartz fissure veins that cut the metasedimentary rocks, and traces of gold in a small beach placer. A pan concentrate of beach gravel contained 0.05 ppm Au, 500 ppm Cu, and 200 ppm Pb; and samples of pyritic tuff and a quartz-pyrite vein respectively contained 0.7 ppm Ag and 0.05 ppm Au (Karl, 1992, loc. 25a-c).
Age: Fissure veins are Cretaceous or younger; placer is Holocene.
Commodities (Major) - Au
Development Status: None
Deposit Model: Low-sulfide Au-quartz veins; Placer Au-PGE (Cox and Singer, 1986; models 36a, 3
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:
| ⓘ Native Gold Formula: Au |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| 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 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS - Alaska: | KC142 |
|---|
Other Regions, Features and Areas containing this locality
North America
- Coast MountainsMountain Range
North America PlateTectonic Plate
- Alexander DomainDomain
- Alexander TerraneVolcanic Arc
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