Unnamed Occurrence (ARDF - HE190; south wall of valley of upper Windy Creek), Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 6' 35'' North , 147° 12' 53'' West
Latitude & Longitude (decimal):
KΓΆppen climate type:
Mindat Locality ID:
200790
Long-form identifier:
mindat:1:2:200790:1
GUID (UUID V4):
8f379f98-76e5-4da6-a038-0ed3c9804565
Location: This occurrence is at an elevation of about 4,300 feet on the south wall of the valley of upper Windy Creek. It is in the NW1/4 of sec. 8, T. 21 S., R. 3 E., of the Fairbanks Meridian. The location is accurate to within 500 feet. This occurrence is site 32 in Smith (1981).
Geology: The bedrock in the area of this occurrence is mainly the Middle or Upper Triassic Nikolai Greenstone, a thick sequence of subaerial and submarine basalt flows and minor interbedded volcaniclastic sedimentary rocks, aquagene and epiclastic tuff, breccia, argillite, and radiolarian chert (Nokleberg and others, 1992). This small mineral occurrence consists of a small shear zone along which hydrothermal alteration has produced epidote, chalcopyrite, and iron carbonate minerals. Weathering produces malachite- and azurite-coated float and encrustations. This small mineral occurrence is one of many similar deposits in the Nikolai Greenstone. Most of these occurrences are part of an east-northeast trending fault zone several miles wide.
Age: Triassic or younger.
Alteration: Propylitic alteration of greenstone.
Commodities (Major) - Copper
Development Status: None
Deposit Model: Hydrothermally altered shear zone.
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:
β Azurite Formula: Cu3(CO3)2(OH)2 |
β Chalcopyrite Formula: CuFeS2 |
β Epidote Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
β Malachite Formula: Cu2(CO3)(OH)2 |
β Siderite Formula: FeCO3 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 2 - Sulphides and Sulfosalts | |||
---|---|---|---|
β | Chalcopyrite | 2.CB.10a | CuFeS2 |
Group 5 - Nitrates and Carbonates | |||
β | Siderite | 5.AB.05 | FeCO3 |
β | Azurite | 5.BA.05 | Cu3(CO3)2(OH)2 |
β | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
Group 9 - Silicates | |||
β | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | β Azurite | Cu3(CO3)2(OH)2 |
H | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
H | β Malachite | Cu2(CO3)(OH)2 |
C | Carbon | |
C | β Azurite | Cu3(CO3)2(OH)2 |
C | β Malachite | Cu2(CO3)(OH)2 |
C | β Siderite | FeCO3 |
O | Oxygen | |
O | β Azurite | Cu3(CO3)2(OH)2 |
O | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
O | β Malachite | Cu2(CO3)(OH)2 |
O | β Siderite | FeCO3 |
Al | Aluminium | |
Al | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Si | Silicon | |
Si | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
S | Sulfur | |
S | β Chalcopyrite | CuFeS2 |
Ca | Calcium | |
Ca | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Fe | Iron | |
Fe | β Chalcopyrite | CuFeS2 |
Fe | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Fe | β Siderite | FeCO3 |
Cu | Copper | |
Cu | β Azurite | Cu3(CO3)2(OH)2 |
Cu | β Chalcopyrite | CuFeS2 |
Cu | β Malachite | Cu2(CO3)(OH)2 |
Other Databases
Link to USGS - Alaska: | HE190 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Wrangellia DomainDomain
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