Unnamed Occurrence (ARDF - MF017; between Fairweather and Sea Otter Glaciers), Yakutat Mining District, Yakutat, Alaska, USAi
Regional Level Types | |
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Unnamed Occurrence (ARDF - MF017; between Fairweather and Sea Otter Glaciers) | - not defined - |
Yakutat Mining District | Mining District |
Yakutat | City Borough |
Alaska | State |
USA | Country |
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Latitude & Longitude (WGS84):
58° 52' 58'' North , 137° 38' 56'' West
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
201108
Long-form identifier:
mindat:1:2:201108:3
GUID (UUID V4):
e8376400-b2fb-462f-8be6-7137a904a502
The site is in Glacier Bay National Park and Preserve. Further search for the source of the metalliferous moraine would need mountaineering support.
Location: Sulfide and heavy oxide boulders occur in the moraine about 4.5-7 miles west-southwest of the top of Mt. Fairweather on an east-heading glacier that is between Fairweather and Sea Otter Glaciers. The coordinates given above are for the approximate location of Bureau of Mines sample 7S008 (Kimball and others, 1978) collected at an elevation of about 3500 feet. The Bureau estimated the collection elevation at about 3700 feet which would be about 0.4 mile to the east of the coordinates assumed here. Sample 7S009 was collected in moraine about 0.4 mile south, slightly east, of the 7S008 location. The exact locations of the samples are not believed to be critical.
Geology: This occurrence consists of boulders on a moraine about 1 mile southwest of the contact of the Mt. Fairweather layered mafic intrusion. The boulders consist of mafic intrusive rocks which contain disseminated sulfides, including chalcopyrite and nickel-bearing minerals. The boulders were derived from the intrusion. An area of bedrock about 1.5 miles northeast of the boulder field is conspicuously copper-stained and may be at or near the source of the boulders. Samples collected from the moraine field by Plafker and MacKevett (1970) and by Kimball and others (1978)contained as much as 0. 5 percent copper, 0.2 percent nickel, a trace of silver, also as much as 0.005 ounce/ton platinum and 0.008 ounce/ton palladium. A sample collected below the copper-stained bedrock area contained 0.2 percent vanadium.
Workings: Sampling by Plafker and MacKevett (1970) was followed up by the Bureau of Mines (Kimball and others, 1978). Samples collected by the Bureau (7S008 and 009) contain 0.002-0.005 ounce/ton platinum, 0.008-0.01 ounce/ton palladium, as much as 1.5 ppm Ag, about 0. 5 percent copper and 0.2 percent nickel, and 150 ppm cobalt. A sample of gabbro within the intrusive and below the copper-stained area contained 0.2 percent vanadium.
Age: Tertiary.
Commodities (Major) - Cu, Ni; (Minor) - Ag, Co, Cr, PGE, V
Development Status: None
Deposit Model: Metalliferous glacial moraine. The metalliferous boulders are derived from prim
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
3 valid minerals.
Detailed Mineral List:
ⓘ Chalcopyrite Formula: CuFeS2 |
ⓘ Pentlandite Formula: (NixFey)Σ9S8 |
ⓘ Pyrrhotite Formula: Fe1-xS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 2 - Sulphides and Sulfosalts | |||
---|---|---|---|
ⓘ | Pentlandite | 2.BB.15 | (NixFey)Σ9S8 |
ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
List of minerals for each chemical element
S | Sulfur | |
---|---|---|
S | ⓘ Chalcopyrite | CuFeS2 |
S | ⓘ Pentlandite | (NixFey)Σ9S8 |
S | ⓘ Pyrrhotite | Fe1-xS |
Fe | Iron | |
Fe | ⓘ Chalcopyrite | CuFeS2 |
Fe | ⓘ Pentlandite | (NixFey)Σ9S8 |
Fe | ⓘ Pyrrhotite | Fe1-xS |
Ni | Nickel | |
Ni | ⓘ Pentlandite | (NixFey)Σ9S8 |
Cu | Copper | |
Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Databases
Link to USGS - Alaska: | MF017 |
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