San Juan Prospect, Kitkun Bay, Prince of Wales Island, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| San Juan Prospect | Prospect |
| Kitkun Bay | Bay |
| Prince of Wales 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° 9' 2'' North , 132° 10' 55'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Hollis | 112 (2011) | 53.5km |
Mindat Locality ID:
199825
Long-form identifier:
mindat:1:2:199825:5
GUID (UUID V4):
9eafd0f8-3051-40d7-a4a0-055b9653c4fe
Location: The San Juan prospect is east of the head of Kitkun Bay at an elevation of about 400 feet. It is 1.0 mile west-southwest of hill 1305 and about 0.1 mile northeast of the center of section 32, T. 77 S., R. 88 E.
Geology: The San Juan prospect was discovered prior to 1902 and was explored intermittently until 1913 (Brooks, 1902; Wright and Wright, 1908; Smith, 1914). The rocks in the vicinity consist of greenschist and marble of the Wales Group of Late Proterozoic and Cambrian age (Eberlein and others, 1983; Brew, 1996). Maas and others (1991) describe a tunnel 320 feet long and another 20 feet long, neither of which exposes ore. A higher adit, 165 feet long, cuts a fault zone up to 10 feet thick with fragments of gouge, sericite schist, quartz-schist-marble breccia, and quartz, all with varying amounts of pyrite. Samples from the fault zone contained 16 to 860 parts per billion gold; a dump sample of milky quartz contained 6.68 parts per million gold. Based on a grid of soil samples, Hedderly-Smith (1999 [Inventory]) defined a stratabound epithermal breccia deposit as much as 4 feet thick that can be traced for over 700 feet. Based on numerous chip samples, he estimated that the average grade is less than 0.03 to 0.1 ounce of gold per ton.
Workings: The workings consist of a 20 foot and a 320-foot tunnel, neither of which cuts mineralization. A 165-foot tunnel cuts a mineralized fault zone. There was considerable sampling by government and private geologists in the the late 1980's and 1990's.
Age: The deposit is younger than the Late Proterozoic or Cambrian host rocks.
Commodities (Major) - Au
Development Status: None
Deposit Model: Low-sulfide gold-quartz vein (breccia) (Cox and Signer, 1986; model 36a).
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.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | 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 | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
Other Databases
| Link to USGS - Alaska: | CR177 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Alexander DomainDomain
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References
