Matilda & House prospects, Dolomi Mountain, Prince of Wales Island, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
55° 8' 53'' North , 132° 3' 7'' West
Latitude & Longitude (decimal):
Type:
Group of Prospects
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Metlakatla | 1,405 (2017) | 30.4km |
| Ketchikan | 8,197 (2017) | 33.5km |
| Saxman | 417 (2017) | 34.6km |
Location: This site is arbitrarily plotted in the middle of James Lake, in the SE¼ sec. 31, T77S, R89E, about 1.4 km (4,400 feet) E of Dolomi Mountain. These prospects were briefly described by Brooks (1902), who did not give good locations, and they have not been described since. The Matilda claim is north of the Fortune (CR 205) claim, which is south of James Lake. The House claim is about a mile north of Dolomi. The Matilda and House claims are probably within 0.5 mile of James Lake.
Geology: The only published descriptions of the Matilda and House claims are by Brooks (1902). The deposit on the Matilda claim is a quartz vein 3 feet thick that strikes east and dips 60S. The vein is in sheared mica schist; it contains pyrite and 'is said to carry gold.' The deposit on the House claim is a quartz vein 1 to 2 feet thick that cuts marble. The vein, which is exposed in a small pit, strikes N15E and dips 30NW; it contains (minor?) pyrite, chalcopyrite, and tetrahedrite. The rocks in the Dolomi area are part of the Wales Group of Late Proterozoic and Cambrian age (Herreid, 1967). They are folded into a large dome centered over the eastern third of Paul Lake, and consist of several marble layers 200 to 1300 feet thick, interbedded with calcareous chlorite schist and marble.
Workings: Probably only surface pits.
Age: The vein is younger than the Late Proterozoic or Cambrian host rocks.
Commodities (Major) - Au; (Minor) - Cu, Sb
Development Status: None
Deposit Model: Low-sulfide, brecciated gold-quartz vein (Cox and Singer, 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
3 valid minerals.
Detailed Mineral List:
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ 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 | |||
|---|---|---|---|
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | 'Tetrahedrite Subgroup' | 2.GB.05 | Cu6(Cu4C2+2)Sb4S12S |
| 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 |
| S | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Cu | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
| Sb | Antimony | |
| Sb | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
Other Databases
| Link to USGS - Alaska: | CR196 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Alexander DomainDomain
- Alexander TerraneVolcanic Arc
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