Unnamed Prospect (ARDF - JU023; Greek Boy upper pits), Juneau Mining District, Juneau, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Prospect (ARDF - JU023; Greek Boy upper pits) | - not defined - |
| Juneau Mining District | Mining District |
| Juneau | City Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
58° 52' 24'' North , 135° 0' 57'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This prospect consists of four open cuts that vary in elevation from 2,300 to 3,400 feet, about 5 miles north of the mouth of the Berners River where it empties into Berners Bay. It is 2 miles north-northeast of the Jualin mine (JU044), and 1.5 miles east of Lions Head Mountain, in the SW1/4 section 35, T. 34 S., R. 62 E. of the Copper River Meridian. The location marks the approximate center of several pits and is accurate. There are several adits 1 mile south-southeast of these workings which are the Greek Boy prospect (JU035). This prospect has sometimes been included with the Greek Boy prospect (Redman and others, 1989), but because of the great distance from the Greek Boy prospect, this prospect is listed as a separate prospect.
Geology: The prospect consists of four open cuts that follow a 4- to 10-foot-thick quartz vein in chlorite schist, 100 to 200 feet from diorite contact. The vein contains minor pyrite. U.S. Bureau of Mines samples from the pits contained up to 4.2 ppm gold, 3.5 ppm silver and 1,560 ppm copper (Redman and others, 1989). The prospect is within 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 Late Cretaceous, Jualin Diorite, which intrudes Upper Triassic metabasalt (Miller and others, 1995). The age of mineralization in the Berners Bay area is about 55 Ma, the same as the other mesothermal gold vein deposits in the Juneau Gold Belt (Goldfarb and others, 1997).
Workings: The deposit has been explored by four open cuts.
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) - Ag, Au, Cu
Development Status: No
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
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: | JU023 |
|---|
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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