Unnamed Occurrence (ARDF - SK018; near Mt. Barnard), Glacier Bay Mining District, Juneau Mining District, Alaska, USAi
Regional Level Types | |
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Unnamed Occurrence (ARDF - SK018; near Mt. Barnard) | - not defined - |
Glacier Bay Mining District | - not defined - |
Juneau Mining District | Mining District |
Alaska | State |
USA | Country |
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Latitude & Longitude (WGS84):
59° 5' 24'' North , 136° 54' 0'' West
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
201612
Long-form identifier:
mindat:1:2:201612:5
GUID (UUID V4):
a301d119-8d05-4a93-9fd4-6bf7e6369087
There are probably similar deposits in the vicinity, but the rugged terrain and glaciers hamper investigation (Brew and others, 1978). The deposit is within Glacier Bay National Park and Preserve where exploration and development is restricted.
Location: This occurrence is at an elevation of 5,475 feet in Glacier Bay National Park and Preserve; it is at the top of a nunatak, 2.6 miles southeast of the summit of Mount Barnard. It is shown as location 38 on Plate III of Brew and others (1978) and location SE27 by Nokleberg and others (1987).
Geology: The following description is summarized from Brew and others (1978). Small pods up to 0.5 foot thick of pyrrhotite and pyrite with a trace of chalcopyrite are associated with andesite, greenstone, epidote, and thin bands of limestone or marble. Abundant chloritic and some sericitic alteration are in a contact metamorphic zone near a Cretaceous granitic intrusive. A grab sample of one pod contained 1,000 ppm copper, 0.1 ppm gold, 0.5 ppm silver, and 100 ppm cobalt. The mineralization is probably Cretaceous, based on the age of the granitic intrusive which is associated with it.
Age: Probably Cretaceous or younger based on its association with nearby granitic intrusive rocks (Brew and others, 1978).
Alteration: Chloritization, epidotization, sericitization.
Commodities (Major) - Cu; (Minor) - Ag, Au, Co
Development Status: None
Deposit Model: Probable replacement deposit adjacent to intrusive (Cox and Singer, 1986; model
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
4 valid minerals.
Detailed Mineral List:
ⓘ Chalcopyrite Formula: CuFeS2 |
ⓘ Epidote Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
ⓘ Pyrite Formula: FeS2 |
ⓘ Pyrrhotite Formula: Fe1-xS |
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 |
ⓘ | Pyrite | 2.EB.05a | FeS2 |
Group 9 - Silicates | |||
ⓘ | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
O | Oxygen | |
O | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Al | Aluminium | |
Al | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Si | Silicon | |
Si | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
S | Sulfur | |
S | ⓘ Chalcopyrite | CuFeS2 |
S | ⓘ Pyrite | FeS2 |
S | ⓘ Pyrrhotite | Fe1-xS |
Ca | Calcium | |
Ca | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Fe | Iron | |
Fe | ⓘ Chalcopyrite | CuFeS2 |
Fe | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Fe | ⓘ Pyrite | FeS2 |
Fe | ⓘ Pyrrhotite | Fe1-xS |
Cu | Copper | |
Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Databases
Link to USGS - Alaska: | SK018 |
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Other Regions, Features and Areas containing this locality
North America
- Coast MountainsMountain Range
North America PlateTectonic Plate
- Alexander DomainDomain
USA
- Alaska
- Juneau Mining DistrictMining District
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