Henrietta Prospect, Chichagof Mining District (Chicagof Mining District), Sitka, Alaska, USAi
| Regional Level Types | |
|---|---|
| Henrietta Prospect | Prospect |
| Chichagof Mining District (Chicagof Mining District) | Mining District |
| Sitka | City Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
56° 59' 39'' North , 135° 8' 9'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Sitka | 8,863 (2017) | 13.5km |
Mindat Locality ID:
197945
Long-form identifier:
mindat:1:2:197945:2
GUID (UUID V4):
2b073307-5297-46a6-b1a4-ace3ccec26e1
MAS number: 0021160027.
Location: There is little information about the Henrietta prospect and it was not found by Bittenbender and others (1999). It is probably about 0.7 mile north-northeast of Arguello Island at the head of Silver Bay and about 0.5 mile south-southeast of the center of section 19, T. 56 S., R. 65 E.
Geology: This deposit is one of many of similar deposits (PA002 to PA018) scattered over an area of about 6 square miles at the head of Silver Bay (Bittenbender and others, 1999). The deposits are gold-quartz veins with sparse sulfides, usually only pyrite and arsenopyrite. Samples that have been analyzed with modern methods usually show anomalous arsenic even if arsenopyrite is not identified in the rocks, and several parts per million mercury. The veins are often parallel to the bedding of the host rock which is graywacke and argillite of the Sitka Graywacke of Cretaceous age (Loney and others, 1975). Many of the so-called veins in the early literature are actually fault zones with lenses of quartz or concentrations of quartz stringers along the fault zone. Prospecting began in the area in 1871. The Stewart Mine (PA012) was located in 1872 and it was the first lode-gold mine in Alaska. The Silver Bay area has been prospected intermittently to the present but the veins are relatively small and most are low grade. The area has produced relatively little gold, many of the properties have not been active since before 1900, and there has been no production since the early 1940's. There is little information about the Henrietta prospect other than that it was staked before 1912 (Knopf, 1912). It could not be found by Bittenbender and others (1999) but was shown on their map of the properties in the area. It is probably similar to the other deposits in the Silver Bay area.
Workings: No report of work other than active before 1912.
Age: Cretaceous or younger based on the age of the host rocks.
Reserves: None.
Commodities (Major) - Au?
Development Status: None
Deposit Model: Probably a low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsGallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
Other Databases
| Link to USGS - Alaska: | PA004 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Chugach DomainDomain
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References
