Unnamed Occurrence (ARDF - TL056; on the Yentna Glacier), Yentna Mining District, Matanuska-Susitna Borough, Alaska, USAi
Regional Level Types | |
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Unnamed Occurrence (ARDF - TL056; on the Yentna Glacier) | - not defined - |
Yentna Mining District | Mining District |
Matanuska-Susitna Borough | Borough |
Alaska | State |
USA | Country |
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Latitude & Longitude (WGS84):
62° 44' 13'' North , 151° 40' 40'' West
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
201828
Long-form identifier:
mindat:1:2:201828:0
GUID (UUID V4):
58fc16c9-4961-47dc-96ab-5ad6cc3addbc
This site is within Denali National Park and Preserve.
Location: Reed and others (1978, locality 28) show the location of mineralized cobbles in moraine along the west limit of the Yentna Glacier in the northeast quarter of Section 34, T. 31 N, R. 13 W., of the Seward Meridian within Denali National Park and Preserve. This site is located approximately two and a half miles north-northeast of TL057.
Geology: Granodiorite cobbles with fractures containing molybdenite, pyrite and minor chalcopyrite found at this site on the Yentna Glacier moraine are probably derived from the middle Tertiary (38 m.y.) Foraker pluton (Reed and others, 1978; Reed and Nelson, 1980). Minor malachite staining in Paleozoic sedimentary rocks is noted near the pluton contact. Further information that supports the Foraker pluton as the source of the float is anomalous copper (300 to 700 ppm) in a stream sediment and glacial debris sample taken from a site on the Yentna Glacier which drains the Foraker pluton (Curtin, Karlson, O'Leary, Day, and McDougal,1978). Use of a porphyry for this occurrence is not to suggest that a cobble with mineralized fractures is in itself a porphyry deposit. Instead, its possible affiliation with the Mt. Foraker pluton suggests that these veins could be a distal feature related to a concealed porphyry system. Not enough data exists to quantify this determination (Reed and others, 1978). This site is located approximately two and a half miles north-northeast of TL057 on the Yentna Glacier moraine.
Workings: Reconnaissance mapping and rock sampling are all that have been done here (Reed and Nelson, 1980). Minor malachite staining in Paleozoic sedimentary rocks is noted near the pluton contact. Further information that supports the Foraker pluton as the source of the float is anomalous copper (300 to 700 ppm) in a stream sediment and glacial debris sample taken from a site on the Yentna Glacier which drains the Foraker pluton (Curtin, Karlson, O'Leary, Day, and McDougal,1978).
Age: Middle Tertiary; mineralization is interpreted to be related to the 38 m.y. Foraker pluton (Reed and Nelson, 1980).
Commodities (Major) - Cu, Mo
Development Status: None
Deposit Model: Possibly related to Porphyry Cu-Mo (Cox and Singer, 1986; model 21a) or Porphyr
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 |
ⓘ Molybdenite Formula: MoS2 |
ⓘ Pyrite Formula: FeS2 |
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 |
ⓘ | Pyrite | 2.EB.05a | FeS2 |
List of minerals for each chemical element
S | Sulfur | |
---|---|---|
S | ⓘ Chalcopyrite | CuFeS2 |
S | ⓘ Molybdenite | MoS2 |
S | ⓘ Pyrite | FeS2 |
Fe | Iron | |
Fe | ⓘ Chalcopyrite | CuFeS2 |
Fe | ⓘ Pyrite | FeS2 |
Cu | Copper | |
Cu | ⓘ Chalcopyrite | CuFeS2 |
Mo | Molybdenum | |
Mo | ⓘ Molybdenite | MoS2 |
Other Databases
Link to USGS - Alaska: | TL056 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Farewell-McGrath DomainDomain
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