Unnamed Occurrence (ARDF - SK011; on western edge of McBride Glacier), Glacier Bay Mining District, Juneau Mining District, Alaska, USAi
Regional Level Types | |
---|---|
Unnamed Occurrence (ARDF - SK011; on western edge of McBride Glacier) | - 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° 4' 12'' West
Latitude & Longitude (decimal):
KΓΆppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Mosquito Lake | 309 (2011) | 48.8km |
Mindat Locality ID:
201608
Long-form identifier:
mindat:1:2:201608:8
GUID (UUID V4):
07a60ede-9792-4d86-be73-180bfd34ceef
The occurrence is within Glacier Bay National Park and Preserve where mining and prospecting are restricted.
Location: This occurrence is in the Glacier Bay National Park and Preserve on the western edge of the McBride Glacier at an elevation of approximately 2000 feet. (Note: the text in Brew and others (1978) notes this occurrence at an elevation of 2500 feet, but they plotted it where the 2,000-foot contour line intersects the western edge of the McBride Glacier) It is near the center of section 13, T. 32 S., R. 55 E. of the Copper River Meridian. The approximate location is shown as number 7 in Cobb (1972 [MF 424]) and is more accurately located as number 77 on Plate III of Brew and others (1978).
Geology: The following description is summarized from Brew and others (1978). Arsenopyrite, chalcopyrite, pyrite, pyrrhotite, and traces of gold occur in ankeritic zones near an irregular, interfingered contact that marks a facies change between marble and phyllite. About 10 separate zones are present, each less than 10 feet wide and less than 100 feet long. The zones are copper and iron stained and are conformable to the bedding of the metasediments. One zone forms the hanging wall of 5-foot-wide andesite dike that contains chalcopyrite and pyrite. A 2-foot channel sample across an iron-stained zone in marble contained 0.003 ounce of gold per ton, 13,000 ppm copper, 200 ppm zinc, 15 ppm silver, 7,000 ppm arsenic, 5 ppm molybdenum, and more than 5,000 ppm manganese. Four other samples contained lesser amounts of metals. MacKevett (1971) reported a grab sample of sulfide-bearing rock that contained 0.088 ounce of gold per ton. The metasediments that host the deposit are Permian and Permian(?) in age which establishes a maximum age for the mineralization. Granitic intrusives in the general area are Cretaceous to Tertiary in age (Brew and others, 1978).
Workings: Only sampling of outcrops.
Age: Unknown. The Permian and Permian(?) age of the metasedimentary host rocks establishes a maximum age, but the mineralization may be related to nearby Cretaceous or Tertiary granitic intrusives(Brew and others, 1978).
Commodities (Major) - Au, Cu; (Minor) - Ag, Mo, Zn
Development Status: None
Deposit Model: This is only an occurrence with little available information . Based on the de
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:
β Arsenopyrite Formula: FeAsS |
β Chalcopyrite Formula: CuFeS2 |
β Pyrite Formula: FeS2 |
β Pyrrhotite Formula: Fe1-xS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 2 - Sulphides and Sulfosalts | |||
---|---|---|---|
β | Chalcopyrite | 2.CB.10a | CuFeS2 |
β | Pyrrhotite | 2.CC.10 | Fe1-xS |
β | Pyrite | 2.EB.05a | FeS2 |
β | Arsenopyrite | 2.EB.20 | FeAsS |
List of minerals for each chemical element
S | Sulfur | |
---|---|---|
S | β Arsenopyrite | FeAsS |
S | β Chalcopyrite | CuFeS2 |
S | β Pyrite | FeS2 |
S | β Pyrrhotite | Fe1-xS |
Fe | Iron | |
Fe | β Arsenopyrite | FeAsS |
Fe | β Chalcopyrite | CuFeS2 |
Fe | β Pyrite | FeS2 |
Fe | β Pyrrhotite | Fe1-xS |
Cu | Copper | |
Cu | β Chalcopyrite | CuFeS2 |
As | Arsenic | |
As | β Arsenopyrite | FeAsS |
Other Databases
Link to USGS - Alaska: | SK011 |
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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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