Unnamed Occurrence (ARDF - TR007; near head of Yehring Creek), Juneau Mining District, Juneau, Alaska, USAi
Regional Level Types | |
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Unnamed Occurrence (ARDF - TR007; near head of Yehring Creek) | - not defined - |
Juneau Mining District | Mining District |
Juneau | City Borough |
Alaska | State |
USA | Country |
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Latitude & Longitude (WGS84):
58° 24' 1'' North , 133° 49' 37'' West
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
201862
Long-form identifier:
mindat:1:2:201862:4
GUID (UUID V4):
61a417c0-be52-4bae-a623-4dec897d2b32
Location: This occurrence is near the crest of the ridge between the north fork of Davidson Creek and the head of Yehring Creek. It is in SE1/4 section 15, T.40 S., R.70 E. of the Copper River Meridian. The map location is the approximate center of several reported occurrences and is accurate within 1/4 mile.
Geology: This occurrence is in the Coast Range plutonic-metamorphic complex which consists of high-grade schist and gneiss intruded by Cretaceous and Tertiary granodiorite (Brew and Ford, 1974, 1984). The rocks at this occurrence consist of Tertiary granite to granodiorite. The occurrence consists of molybdenite, chalcopyrite, pyrite, and pyrrhotite in a granular iron-stained quartz monzonite. The molybdenite occurs as large flakes concentrated along the contact between the quartz monzonite and granodiorite. The molybdenite is erratically distributed and appears to be confined to areas marked by iron-staining (Clough, 1990). The U.S. Bureau of Mines has reported values up to 0.606% copper and more than 2.0% molybdenum in selected float samples (Clough, 1990). K/Ar dating of hydrothermal muscovite at the near by, geologically similar Boundary Creek 2 (TR003) occurrence indicates that the molybdenite formed at or after 59.7 Ma (Miller and others, 1997).
Workings: This occurrence was discovered by the U.S. Bureau of Mines in 1985 (Clough, 1990) There are no surface or underground workings and exploration has been limited.
Age: K/Ar dating of hydrothermal muscovite at the near by, geologically similar Boundary Creek 2 (TR003) occurrence indicates that the molybdenite formed at or after 59.7 Ma (Miller and others, 1997).
Alteration: Locally conspicuous iron staining.
Commodities (Major) - Mo; (Minor) - Ag, Au, Cu
Development Status: None
Deposit Model: Porphyry Mo (Cox and Singer, 1986; model 21b)
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
5 valid minerals.
Detailed Mineral List:
ⓘ Chalcopyrite Formula: CuFeS2 |
ⓘ Molybdenite Formula: MoS2 |
ⓘ Pyrite Formula: FeS2 |
ⓘ Pyrrhotite Formula: Fe1-xS |
ⓘ Quartz Formula: SiO2 |
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 |
ⓘ | Molybdenite | 2.EA.30 | MoS2 |
ⓘ | Pyrite | 2.EB.05a | FeS2 |
Group 4 - Oxides and Hydroxides | |||
ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
O | Oxygen | |
---|---|---|
O | ⓘ Quartz | SiO2 |
Si | Silicon | |
Si | ⓘ Quartz | SiO2 |
S | Sulfur | |
S | ⓘ Chalcopyrite | CuFeS2 |
S | ⓘ Molybdenite | MoS2 |
S | ⓘ Pyrite | FeS2 |
S | ⓘ Pyrrhotite | Fe1-xS |
Fe | Iron | |
Fe | ⓘ Chalcopyrite | CuFeS2 |
Fe | ⓘ Pyrite | FeS2 |
Fe | ⓘ Pyrrhotite | Fe1-xS |
Cu | Copper | |
Cu | ⓘ Chalcopyrite | CuFeS2 |
Mo | Molybdenum | |
Mo | ⓘ Molybdenite | MoS2 |
Other Databases
Link to USGS - Alaska: | TR007 |
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