Indiana Prospect, Juneau Mining District, Juneau, Alaska, USAi
| Regional Level Types | |
|---|---|
| Indiana Prospect | Prospect |
| Juneau Mining District | Mining District |
| Juneau | City Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
58° 50' 51'' North , 135° 2' 56'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Location: The Indiana prospect is on the west side of upper Johnson Creek at an elevation of approximately 800 feet. It is 1/3 mile north of the Jualin Mine (JU044), 2 miles south of Lions Head Mountain, and 4.5 miles north of Berners Bay. It is in the SE1/4 section 10, T. 35 S., R. 62 E. of the Copper River Meridian. The location is accurate.
Geology: The Indiana prospect was worked from 1896 to 1901 and was developed to intersect the northern extension of the Jualin (JU044) vein system. But, the Jualin system deflects from northerly to northwesterly and the Indiana tunnels failed to reach it. The workings consists of a 1600-foot adit, a 900-foot adit, and a 400-foot adit. A 10-stamp mill was also installed but not used at this site (Redman and others, 1989). The workings reportedly intersected auriferous quartz veins and stockworks, but no production occurred (Poncin, 1940). The prospect is currently (2001) under control of Coeur Alaska. This prospect is in the Berners Bay district at the north end of the Juneau Gold Belt. The district is characterized by a series of structurally-controlled, mesothermal, gold-bearing quartz veins. Most of the veins are in Early Cretaceous (105 Ma) Jualin Diorite, which intrudes Mesozoic (Upper Triassic) metabasalt. The Jualin Diorite is largely massive, jointed, and blocky quartz monzonite to quartz monzodiorite. Gold occurs in low-sulfide, quartz-carbonate veins that contain pyrite and tellurides, marked by distinctive ankeritic alteration zones. There are both extensional and shear veins that generally strike north to northwest and dip east. Age data from hydrothermal muscovite from veins at the Jualin mine range from 53.2 Ma to 55.5 Ma (Miller and others, 1994). This coincides with the 55 Ma age of the other mesothermal gold vein deposits in the Juneau Gold Belt (Goldfarb and others, 1997).
Workings: The workings consist of a 1600-foot adit, a 900-foot adit, and a 400-foot adit. A 10-stamp mill was installed (Redman and others, 1989). The prospect is currently (2001) under control of Coeur Alaska.
Age: The age of mineralization in the Berners Bay district is about 55 Ma, the same as the other mesothermal gold-quartz-vein deposits in the Juneau Gold Belt (Goldfarb and others, 1997).
Commodities (Major) - Au
Development Status: None
Deposit Model: Low-sulfide Au-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
1 valid mineral.
Gallery:
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: | JU041 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Coast MountainsMountain Range
North America PlateTectonic Plate
- Taku DomainDomain
- Yukon-TananaVolcanic Arc
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