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Unnamed Occurrence (ARDF - MM058; east side of Spruce Peak), Kantishna Mining District, Denali Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - MM058; east side 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' 53'' North , 150° 41' 49'' West
Latitude & Longitude (decimal):
Köppen climate type:
This occurrence is in Denali National Park and Preserve.
Location: This occurrence is on the east side of Spruce Peak, probably within 800 feet of the top. The location is uncertain. For this record, it corresponds to occurrence 88 of Thornsberry, McKee, and Salisbury (1984, fig. K-8), which is near the center of the E1/2 SW1/4 section 29, T. 15 S., R. 16 W., Fairbanks Meridian.
Geology: At this occurrence, a weakly mineralized reverse(?) fault places metafelsite on the south against highly deformed graphitic schist or phyllite. Both rock types are probably units of the lower Paleozoic Spruce Creek sequence (Bundtzen, 1981). The fault zone is about 10-15 feet wide. It strikes about N 55 E and dips 65-75 N, and contains quartz -calcite veins. The zone and nearby country rocks are stained with limonitic minerals, including goethite and jarosite. The limonite probably replaces pyrite or arsenopyrite. Samples of the oxidized vein contain up to 1400 ppm arsenic, along with a trace each of gold and silver (Thornsberry, McKee, and Salisbury, 1984, v. 2, occurrence 88).
Workings: There are no workings. The oxidized fault zone can be traced in outcrop (rubblecrop?) for several tens of feet.
Age: The deposit is assumed to be Eocene (see record MM091).
Alteration: Silicification of a fault zone. Iron-oxide alteration.
Commodities (Major) - Ag, Au; (Minor) - As
Development Status: None
Deposit Model: Low-sulfide Au-quartz vein (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
6 valid minerals.
Detailed Mineral List:
| ⓘ Arsenopyrite ? Formula: FeAsS |
| ⓘ Calcite Formula: CaCO3 |
| ⓘ Goethite Formula: Fe3+O(OH) |
| ⓘ Jarosite Formula: KFe3+3(SO4)2(OH)6 |
| ⓘ 'Limonite' |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Arsenopyrite ? | 2.EB.20 | FeAsS |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Goethite | 4.00. | Fe3+O(OH) |
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| 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 | Fe3+O(OH) |
| H | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| C | Carbon | |
| C | ⓘ Calcite | CaCO3 |
| O | Oxygen | |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Goethite | Fe3+O(OH) |
| O | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Arsenopyrite | FeAsS |
| S | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| S | ⓘ Pyrite | FeS2 |
| K | Potassium | |
| K | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Fe | Iron | |
| Fe | ⓘ Arsenopyrite | FeAsS |
| Fe | ⓘ Goethite | Fe3+O(OH) |
| Fe | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| Fe | ⓘ Pyrite | FeS2 |
| As | Arsenic | |
| As | ⓘ Arsenopyrite | FeAsS |
Other Databases
| Link to USGS - Alaska: | MM058 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- North America PlatformPassive Margin
- Yukon-Tanana lower DomainDomain
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