Unnamed Occurrence (ARDF - TE011; on north side of Cape Creek valley), Port Clarence Mining District, Nome Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
65° 34' 58'' North , 167° 56' 27'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Wales | 149 (2018) | 7.3km |
Location: This lode tin occurrence is located at 500 feet elevation on the south flank of the ridge between the headwaters of Cape Creek (TE006) and Goodwin Gulch (TE004). Detrital cassiterite mapping in the headwaters of Cape Creek led to discovery of the mineralized outcrops (Mulligan, 1966, p. 22-23). This location is 3,750 feet upstream from the mouth of the west headwater fork of Cape Creek; it was not identified as a separate location by Cobb and Sainsbury (1972) or Cobb (1975).
Geology: This area is in Mississppian marble (Sainsbury, 1972) peripheral to the Late Cretaceous Cape Mountain biotite granite stock (Hudson and Arth, 1983). A small granite intrusion, identified over about a 20-foot length in a dozer trench, is apparently altered and associated with some mineralized (?) marble. The dozer trench, 145 feet long, is mostly in blocky, gray, limestone (marble) but clay alteration and 'green segregations in clay' are noted in the field descriptions (Mulligan, 1966, p. 32). Samples from the portion of the trench exposing granite and clay contained 0.01 % tin; the green segregations in clay contained 0.69 % tin (Mulligan, 1966, p. 32).
Workings: A 20-foot zone of granite and clay alteration is exposed within a 145- foot dozer trench. Detrital cassiterite mapping has been completed in the east headwater fork of Cape Creek.
Age: Late Cretaceous; tin metallization in the Cape Mountain area is interpreted to be linked to evolution of the Cape Mountain biotite granite that has been determined to be 78.8 +/- 2.9 my by the K/Ar method (Hudson and Arth, 1983, p. 769).
Alteration: Much clay alteration appears to be developed.
Commodities (Major) - Sn
Development Status: None
Deposit Model: Lode; cassiterite in altered granite. Analogy to deposit models not clear
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: | TE011 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Brooks-Seward DomainDomain
- Nome ComplexAccretionary Complex
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