Jumbo Prospect (ARDF - JU194), Juneau Mining District, Juneau, Alaska, USAi
| Regional Level Types | |
|---|---|
| Jumbo Prospect (ARDF - JU194) | Prospect |
| Juneau Mining District | Mining District |
| Juneau | City Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
58° 16' 19'' North , 134° 25' 11'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Juneau | 32,756 (2017) | 3.3km |
Location: The Jumbo prospect is at an elevation of approximately 800 feet on Douglas Island, 3/4 mile west of Douglas. It is in the SW1/4NW1/4 section 35, T. 41 S., R. 67 E. of the Copper River Meridian. The location is accurate.
Geology: The Jumbo prospect was discovered in 1922 when native gold was found while sluicing surface trenches. There are four, 200-foot long trenches and a short shaft on the prospect which is in black phyllite and pyritic greenschist (Redman and others, 1989). The pyrite occurs as cubes disseminated in the greenschist. U.S. Bureau of Mines samples contained no significant metal values (Redman and others, 1989). The rocks in the general area are Upper Jurassic or Cretaceous marine argillite and graywacke, interbedded with andesite or basalt (Brew and Ford, 1985). The bedded rocks are regionally metamorphosed to prehnite-pumpellyite or greenschist grade, and cut by diorite or gabbro dikes and sills.
Workings: The deposit at the Jumbo prospect was discovered in 1922 when native gold was found while sluicing surface trenches. There are four, 200-foot long trenches and a short shaft on the prospect.
Commodities (Major) - Au
Development Status: None
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 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Au | Gold | |
| Au | ⓘ Gold | Au |
Other Databases
| Link to USGS - Alaska: | JU194 |
|---|
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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