3-J; Three J; 3 J Prospects, Chichagof Mining District (Chicagof Mining District), Hoonah-Angoon Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| 3-J; Three J; 3 J Prospects | Group of Prospects |
| Chichagof Mining District (Chicagof Mining District) | Mining District |
| Hoonah-Angoon Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
57° 47' 12'' North , 135° 2' 45'' West
Latitude & Longitude (decimal):
Type:
Group of Prospects
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Tenakee Springs | 133 (2017) | 10.3km |
| Angoon | 456 (2017) | 41.8km |
| Hoonah | 757 (2017) | 42.9km |
Location: According to the U.S. Bureau of Land Management (2002), the 3-J prospect (MAS no. 0021140211) is at an elevation of about 150 feet, about 0.4 mile north of Coffee Cove in Tenakee Inlet, and the Three J prospect (MAS no. 0021140102) is at sea level at the northeast corner of an unnamed cove about 0.5 mile west of Coffee Cove. The prospects are about 0.4 mile apart. Bittenbender and others' location P-26 (1999) coincides with the Bureau's 3-J prospect, and Cobb's location 47 (1972, 1978) coincides with the Bureau's Three J prospect. For this record, the site is plotted at Cobb's location 47 ( which he calls the 3 J (no hyphen)) prospect, at the northeast corner of the unnamed cove. The location is accurate.
Geology: Several prospect are in a stock of Cretaceous granodiorite (Lathram and others, 1965). Smith (1942) reports aplite(?) dikes up to 20 feet thick that cut the granodiorite. Chalcopyrite and molybdenite occur in in the dikes and in the granodiorite, but more chalcopyrite is in the granodiorite and more molybdenite is in the aplite. A chip sample of the dike contained 0.1 percent copper and 0.7 percent molybdenum; a chip sample of the granodiorite contained less than 0.01 percent copper and molybdenum. Bittenbender and others (1999) collected several samples; a 0.3-foot sample contained 0.3 percent copper and 0.02 percent molybdenum. At least one claim was staked in 1941.
Workings: At least one claim as staked in 1941; some surface sampling since by government geologists.
Age: Cretaceous or younger based on the age of the host rock.
Commodities (Major) - Cu, Mo
Development Status: None
Deposit Model: Porphyry molybdenum-copper deposit.
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 |
| ⓘ Molybdenite Formula: MoS2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Molybdenite | 2.EA.30 | MoS2 |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Molybdenite | MoS2 |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Mo | Molybdenum | |
| Mo | ⓘ Molybdenite | MoS2 |
Other Databases
| Link to USGS - Alaska: | SI055 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Alexander DomainDomain
- Alexander TerraneVolcanic Arc
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