Pinnacle Creek Occurrence, Port Clarence Mining District, Nome Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Pinnacle Creek Occurrence | Occurrence |
| Port Clarence Mining District | Mining District |
| Nome Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
65° 53' 34'' North , 166° 10' 15'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Shishmaref | 580 (2017) | 40.6km |
Mindat Locality ID:
199392
Long-form identifier:
mindat:1:2:199392:2
GUID (UUID V4):
66a94d1e-8a37-4640-b619-b6ffa3c039e0
Location: Pinnacle Creek is a north tributary to Crosby Creek with headwaters that extend across the south contact zone into the Ear Mountain granite stock. Ear Mountain is an isolated upland reaching 2,329 feet elevation in the north-central Teller D-3 quadrangle. It is cored by a Late Cretaceous granite stock (Sainsbury, 1972). This is locality 55 and 58 of Cobb and Sainsbury (1972). Cobb (1975) summarized relevant references under the name 'Pinnacle Cr.'.
Geology: Pinnacle Creek crosses the contact zone of the Ear Mountain biotite granite stock. This is a Late Cretaceous (76.7 +/- 2.9 my; Hudson and Arth, 1983, p. 769) composite biotite granite that intrudes an impure and schistose carbonate sequence, with some metapelitic rocks, of unknown but probable Paleozoic age. The country rocks are variably converted to tactite and hornfels around the granite stock (Knopf, 1908, p. 28-29). A USBM churn-drill in the lower part of the creek at an elevation of approximately 360 feet, returned 0.02 pounds of tin per cubic yard. A sample from this hole contained quartz, calcite, orthoclase, plagioclase, grossularite garnet, idocrase, pyrite, traces of blue tourmaline, brown tourmaline, and epidote. Cassiterite was also identified (Mulligan, 1959, p. 29). Pan concentrate material from the headwaters over granite bedrock contained cassiterite, monazite, zircon and 0.18% eU (Killeen and Ordway, 1955).
Workings: One USBM churn-drill hole was completed on the lower part of the creek at approximately 360 feet elevation (Mulligan, 1959, p. 20).
Age: Quaternary
Commodities (Major) - Sn
Development Status: None
Deposit Model: Alluvial tin placer (Cox and Singer, 1986; model 39e)
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:
| ⓘ Cassiterite Formula: SnO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Cassiterite | 4.DB.05 | SnO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Cassiterite | SnO2 |
| Sn | Tin | |
| Sn | ⓘ Cassiterite | SnO2 |
Other Databases
| Link to USGS - Alaska: | TE065 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Brooks-Seward DomainDomain
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References
