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Unnamed Occurrence (ARDF - MM001; north of Chilchukabena Lake), Kantishna Mining District, Denali Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - MM001; north of Chilchukabena Lake) | Occurrence |
| Kantishna Mining District | Mining District |
| Denali Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
63° 58' 58'' North , 151° 32' 48'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Denali National Park | 217 (2013) | 49.9km |
The south part of the granite stock is in Denali National Park and Preserve.
Location: This occurrence is on the west side of the range of low hills that extends north from Chilchukabena Lake. The location is approximately at the midpoint of the boundary between sections 6 and 7, T 11 S., R. 20 W., Fairbanks Meridian. It is probably accurate within about 1000 feet. The location correponds to that of rock samples 5 and 6 of Hawley and Associates (1978).
Geology: A stock of McKinley-type granite (Reed and Lanphere, 1973) forms hills north of Chilchukabena Lake. The outcrop of the stock is about 3 miles long and 1.3 miles across; a small granite cupola crops out northeast of the stock. Only the approximate southern two-thirds of the stock is in the Mt. McKinley quadrangle. In 1975, Hawley and Associates (1978) made an airborne radiometric survey of the area using a hand-held spectrometer. The aircraft flew about 150 feet above the ground at 90 miles per hour. Background radiation over the granite mass was relatively high, partly due to its potassium feldspar content, but the radiation level was more than twice background over the cupola. Hawley and Associates collected samples of slightly altered, fine- and coarse-grained granite onn the south side of the stock (the location of this occurrence). The samples contained up to 50 ppm lead, 200 ppm zinc, 20 ppm beryllium, and 10 ppm tin. The granite at this site resembles the granite that hosts beryllium and base-metal prospects in the Boulder Creek or Tonzona area west of the old park boundary (Hawley and Associates, 1978, p. 4,124-126).
Workings: Hawley and Associates (1978) conducted an airborne radiometric survey and reconnaissance-sampled the stock.
Age: The stock is tentatively correlated with McKinley-type granite, which is about 55 Ma (Reed and Lanphere, 1973).
Alteration: Weak argillic(?) alteration.
Commodities (Major) - Be, Sn, Th, U; (Minor) - Pb, Zn
Development Status: None
Deposit Model: Weakly-altered tin(?) granite.
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
1 valid mineral.
Detailed Mineral List:
| ⓘ 'Feldspar Group' |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Unclassified | |||
| ⓘ | 'Feldspar Group' | - | |
Other Databases
| Link to USGS - Alaska: | MM001 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Arctic AlaskaPassive Margin
- Wickersham DomainDomain
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