Dolly Varden prospect, Twelvemile Arm, Kasaan Bay, Prince of Wales Island, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
55° 20' 33'' North , 132° 41' 20'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Hydaburg | 391 (2017) | 17.4km |
| Hollis | 112 (2011) | 24.0km |
| Craig | 1,248 (2017) | 32.6km |
| Klawock | 765 (2017) | 34.7km |
| Thorne Bay | 483 (2017) | 39.8km |
Mindat Locality ID:
197237
Long-form identifier:
mindat:1:2:197237:8
GUID (UUID V4):
a02e8425-3cef-422f-85c1-b5dcb44584c6
Location: Based on several old but probably reliable references (Brooks, 1902; Wright and Wright, 1908), the Dolly Varden prospect is at an elevation of about 1,100 feet, about 1.7 miles SE of the head of Twelvemile Arm and about 0.6 mile northwest of the center of section 29, T75S, R84E. Herreid and Rose (1966), probably incorrectly, suggest that the Dolly Varden prospect is about 3 miles to the west at their locality 2 (which is ARDF CR109).
Geology: As described by Brooks (1902) and Wright and Wright (1908), the deposit at the Dolly Varden prospect consists of auriferous (quartz?) veins that strike N15E and dip steeply to the SE or are vertical. The veins follow the layering in marble and contain tetrahedrite altered to azurite and malachite. The marble is part of the Wales Group of Cambrian and older age (Eberlein and others, 1983; Brew, 1996). There is no report of workings on these claims. Bufvers (1967) indicates that the quartz stringers occur in an area about 20 feet wide and 30 feet long. A sample taken in 1924 contained $80 a ton in gold and silver. Maas and others (1992, 1995) collected four samples that contained up to 20 parts per billion gold, 7.6 parts per million (ppm) silver, and 1,329 ppm copper.
Workings: Apparently none.
Age: Veins cut marble of Cambrian or older age.
Commodities (Major) - Ag, Au
Development Status: None
Deposit Model: Polymetallic vein? (Cox and Singer, 1986; model 22c).
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
3 valid minerals.
Detailed Mineral List:
| ⓘ Azurite Formula: Cu3(CO3)2(OH)2 |
| ⓘ Malachite Formula: Cu2(CO3)(OH)2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ 'Tetrahedrite Subgroup' Formula: Cu6(Cu4C2+2)Sb4S12S |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | 'Tetrahedrite Subgroup' | 2.GB.05 | Cu6(Cu4C2+2)Sb4S12S |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Azurite | 5.BA.05 | Cu3(CO3)2(OH)2 |
| ⓘ | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| H | ⓘ Malachite | Cu2(CO3)(OH)2 |
| C | Carbon | |
| C | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| C | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | Oxygen | |
| O | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| O | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
| Cu | Copper | |
| Cu | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| Cu | ⓘ Malachite | Cu2(CO3)(OH)2 |
| Cu | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
| Sb | Antimony | |
| Sb | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
Other Databases
| Link to USGS - Alaska: | CR110 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Alexander DomainDomain
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References
