Unnamed Occurrence (ARDF - ID138; near hill 1630), Iditarod Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
Regional Level Types | |
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Unnamed Occurrence (ARDF - ID138; near hill 1630) | - 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° 21' 12'' North , 156° 55' 58'' West
Latitude & Longitude (decimal):
KΓΆppen climate type:
Mindat Locality ID:
200890
Long-form identifier:
mindat:1:2:200890:8
GUID (UUID V4):
a603fe6c-e726-4cf0-a6a6-858d2a98d4e4
Location: This occurrence is near the top of hill 1630 on a ridge separating Granite Creek from the Little East Fork of George River. The occurrence is about 0.5 mile southwest of the center of section 8, T. 26 N., R. 41 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence consists of a system of quartz-tourmaline-epidote veins in hornfels at the southern contact of a small, biotite-quartz-monzonite stock. The stock has been dated as 71.1 Ma (Bundtzen, Miller, and Laird, 1986). Major oxide data for the intrusion are given in Miller and Bundtzen (1994). The mineralized veins occupy vertical joints that strike about N40E and N44W. The size of the occurrence is uncertain. Grab samples of mineralization contain up to 860 parts per million (ppm) zinc, 300 ppm copper, 2,000 parts per billion silver, 5.1 ppm cadmium, and 10 ppm bismuth (McGimsey and others, 1988).
Workings: Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in 1984 (McGimsey and others, 1988). Placer Dome Exploration flew an aeromagnetic survey over the Upper Granite Creek area including the prospect area in 1996. Results of that survey have not been released (L.E. Wyrick, oral communication, 2003).
Age: Undated; the quartz monzonite stock that hosts the mineralization has been dated as 71.1 Ma (Bundtzen, Miller, and Laird, 1986).
Alteration: Development of epidote-quartz-tourmaline greisen.
Commodities (Major) - Cu, Zn; (Minor) - Ag, Bi, Cd
Development Status: None
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c).
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:
β Epidote Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
β Quartz Formula: SiO2 |
β 'Tourmaline' Formula: AD3G6 (T6O18)(BO3)3X3Z |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 4 - Oxides and Hydroxides | |||
---|---|---|---|
β | Quartz | 4.DA.05 | SiO2 |
Group 9 - Silicates | |||
β | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Unclassified | |||
β | 'Tourmaline' | - | AD3G6 (T6O18)(BO3)3X3Z |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
B | Boron | |
B | β Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
O | Oxygen | |
O | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
O | β Quartz | SiO2 |
O | β Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
Al | Aluminium | |
Al | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Si | Silicon | |
Si | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Si | β Quartz | SiO2 |
Ca | Calcium | |
Ca | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Fe | Iron | |
Fe | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Other Databases
Link to USGS - Alaska: | ID138 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Farewell buried DomainDomain
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