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Ebba Prospect, Admiralty Mining District, Hoonah-Angoon Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Ebba Prospect | Prospect |
| Admiralty Mining District | Mining District |
| Hoonah-Angoon Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
57° 39' 49'' North , 134° 13' 33'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Angoon | 456 (2017) | 27.8km |
The prospect is now within the Wilderness of the Admiralty Island National Monument and is closed to mineral exploration and development.
Location: The Ebba prospect is at an elevation of about 300 feet at the southeast end of Hasselborg Lake. The prospect is 0.5 mile southwest of the center of sec. 34, T. 48 S., R. 69 E. It is location 68 of Cobb (1972, 1978) and MAS no. 0021140030 (U.S. Bureau of Land Management, 2002). The location is accurate within 0.2 mile.
Geology: The rocks in the vicinity of the Ebba prospect are part of a unit of Mesozoic and Paleozoic, undifferentiated metamorphic rocks (Lathram and others, 1965). Race and Rose (1967) describe the prospect here as highly chloritized gabbro that is partially replaced by pyrrhotite, chalcopyrite, and possibly other sulfides. The deposit was discovered in 1959 and a claim was staked on it. A sample of the gabbro contained 0.03 percent copper, 0.15 percent nickel, 0.02 ounce of gold per ton, and 1.13 ounce of silver per ton. Unmineralized gabbro occurs nearby and the gabbro is bordered by schist, chert, and black phyllite a few hundred feet away.
Workings: The deposit was discovered and claimed in 1959; there is no indication of any substantial exploration work on it.
Alteration: The mineralized gabbro is highly chloritized.
Commodities (Major) - Ag, Au, Cu, Ni
Development Status: None
Deposit Model: Gabbro with chalcopyrite and pyrrhotite.
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.
Detailed Mineral List:
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Pyrrhotite Formula: Fe1-xS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Pyrrhotite | Fe1-xS |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrrhotite | Fe1-xS |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Databases
| Link to USGS - Alaska: | SI141 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Alexander DomainDomain
- Alexander TerraneVolcanic Arc
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