Unnamed Occurrences (ARDF - MM064; ridge crest southeast of Spruce Peak), Kantishna Mining District, Denali Borough, Alaska, USAi
Regional Level Types | |
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Unnamed Occurrences (ARDF - MM064; ridge crest southeast of Spruce Peak) | - not defined - |
Kantishna Mining District | Mining District |
Denali Borough | Borough |
Alaska | State |
USA | Country |
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Latitude & Longitude (WGS84):
63° 34' 27'' North , 150° 40' 55'' West
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
202023
Long-form identifier:
mindat:1:2:202023:8
GUID (UUID V4):
ae9ceb7b-5af7-4633-9d87-586b7b1e3bd6
The area is in Denali National Park and Preserve.
Location: This record describes a mineralized area on the ridge southeast of Spruce Creek. The location marks the approximate center of the area, in the SW1/4 NE1/4 section 32, T. 15 S., R. 16 W., Fairbanks Meridian. The location is accurate. It corresponds to occurrence 90 (3 symbols) of Thornsberry, McKee, and Salisbury (1984, fig. K-8).
Geology: The country rocks in the general area of these occurrences include metafelsite of the Spruce Creek sequence, and mica schist and quartzite of the Birch Creek Schist (Bundtzen, 1981; Thornsberry, McKee, and Salisbury, 1984, fig. K-2). The occurrences consist of iron-stained quartz veins, quartz float, and soil, in fault-controlled saddles along the ridge southeast of Spruce Creek. The veins strike NE, about parallel to the strike of the hostrocks and the faults. The veins and fault zones are poorly exposed, but probably range in width from about a foot to tens of feet. All are marked by quartz fragments and by red or orange limonitic soils that contain goethite and jarosite. In 1983, the U.S. Bureau of Mines sampled four mineralized fault zones along the ridge (Thornsberry, McKee, and Salisbury, 1984, v. 2, occurrence 90). Three of these zones contained 0.0 to 0.12 ppm gold, 2.4 to 9.7 ppm silver, 110 to 710 ppm lead, and 155 to 465 ppm arsenic, and one contained 1 ppm silver, 305 ppm antimony, and 100 ppm zinc. Oxidation of the deposits is pervasive. Judged from their assays and character of the limonite, the quartz veins probably contained pyrite and small amounts of arsenopyrite, galena, and stibnite.
Workings: Surface mapping and sampling. The deposits were discovered in 1983 and probably have not been further prospected.
Age: The deposit is assumed to be Eocene (see record MM091).
Alteration: Silicification. Pervasive oxidation of deposits.
Commodities (Major) - Ag, Pb; (Minor) - As, Au, Sb
Development Status: None
Deposit Model: Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a).
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:
ⓘ Goethite Formula: α-Fe3+O(OH) |
ⓘ Jarosite Formula: KFe3+3(SO4)2(OH)6 |
ⓘ 'Limonite' |
ⓘ Pyrite Formula: FeS2 |
ⓘ Quartz Formula: SiO2 |
ⓘ Stibnite Formula: Sb2S3 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 2 - Sulphides and Sulfosalts | |||
---|---|---|---|
ⓘ | Stibnite | 2.DB.05 | Sb2S3 |
ⓘ | Pyrite | 2.EB.05a | FeS2 |
Group 4 - Oxides and Hydroxides | |||
ⓘ | Goethite | 4.00. | α-Fe3+O(OH) |
ⓘ | Quartz | 4.DA.05 | SiO2 |
Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
ⓘ | Jarosite | 7.BC.10 | KFe3+3(SO4)2(OH)6 |
Unclassified | |||
ⓘ | 'Limonite' | - |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | ⓘ Goethite | α-Fe3+O(OH) |
H | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
O | Oxygen | |
O | ⓘ Goethite | α-Fe3+O(OH) |
O | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
O | ⓘ Quartz | SiO2 |
Si | Silicon | |
Si | ⓘ Quartz | SiO2 |
S | Sulfur | |
S | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
S | ⓘ Pyrite | FeS2 |
S | ⓘ Stibnite | Sb2S3 |
K | Potassium | |
K | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
Fe | Iron | |
Fe | ⓘ Goethite | α-Fe3+O(OH) |
Fe | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
Fe | ⓘ Pyrite | FeS2 |
Sb | Antimony | |
Sb | ⓘ Stibnite | Sb2S3 |
Other Databases
Link to USGS - Alaska: | MM064 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
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