Unnamed Occurrence (ARDF - ID175; west of Julian Creek), Iditarod Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
Regional Level Types | |
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Unnamed Occurrence (ARDF - ID175; west of Julian Creek) | - not defined - |
Iditarod Mining District | Mining District |
Yukon-Koyukuk Census Area | Census Area |
Alaska | State |
USA | Country |
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Latitude & Longitude (WGS84):
62° 13' 7'' North , 157° 24' 14'' West
Latitude & Longitude (decimal):
KΓΆppen climate type:
Mindat Locality ID:
200915
Long-form identifier:
mindat:1:2:200915:8
GUID (UUID V4):
406b42b9-6e92-4693-b7e1-5c997c7d5e7d
Location: This occurrence is on hill 1390 on the spur that trends northwest between Spruce and Julian Creeks. It is about 0.6 mile northeast of the center of section 34, T. 25 N., R. 44 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence consists of arsenopyrite-bearing quartz veinlets in a sericitically altered, granodiorite intrusion in flysch of the the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Bundtzen and Miller, 1997; Miller, Bundtzen, and Gray, 2005). The intrusion has a 40K/40Ar age of 70.1 Ma. The quartz veinlets occur in an area about 130 feet square. Grab samples of the veins contained up to 10.0 parts per million (ppm) silver, 100 ppm tin, more than 2,000 ppm arsenic, 11.0 ppm bismuth, 3.3 ppm cadmium, and 12 ppm antimony (McGimsey and others, 1988). The mineralized zone is a possible source of the placer gold in Julian (ID177) and Spruce (ID176) Creeks.
Workings: Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in the 1980s (McGimsey and others, 1988).
Age: Unknown; the host intrusion has a 40K/40Ar age of 70.1 Ma (Miller and Bundtzen, 1994).
Alteration: Sericitic alteration of granodiorite.
Commodities (Major) - Ag, Sn; (Minor) - As, Bi, Cd, Sb
Development Status: None
Deposit Model: Sn-polymetallic deposit or Polymetallic vein (Cox and Singer, 1986; model 20b o
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:
β Arsenopyrite Formula: FeAsS |
β Muscovite Formula: KAl2(AlSi3O10)(OH)2 |
β Muscovite var. Sericite Formula: KAl2(AlSi3O10)(OH)2 |
β Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 2 - Sulphides and Sulfosalts | |||
---|---|---|---|
β | Arsenopyrite | 2.EB.20 | FeAsS |
Group 4 - Oxides and Hydroxides | |||
β | Quartz | 4.DA.05 | SiO2 |
Group 9 - Silicates | |||
β | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
β | var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | β Muscovite | KAl2(AlSi3O10)(OH)2 |
H | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
O | Oxygen | |
O | β Muscovite | KAl2(AlSi3O10)(OH)2 |
O | β Quartz | SiO2 |
O | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Al | Aluminium | |
Al | β Muscovite | KAl2(AlSi3O10)(OH)2 |
Al | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Si | Silicon | |
Si | β Muscovite | KAl2(AlSi3O10)(OH)2 |
Si | β Quartz | SiO2 |
Si | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
S | Sulfur | |
S | β Arsenopyrite | FeAsS |
K | Potassium | |
K | β Muscovite | KAl2(AlSi3O10)(OH)2 |
K | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Fe | Iron | |
Fe | β Arsenopyrite | FeAsS |
As | Arsenic | |
As | β Arsenopyrite | FeAsS |
Other Databases
Link to USGS - Alaska: | ID175 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Farewell buried DomainDomain
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