Unnamed Occurrence (ARDF - TE010; on south side of First Chance Creek valley), Port Clarence Mining District, Nome Census Area, Alaska, USAi
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
65° 34' 4'' North , 167° 57' 3'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Wales | 149 (2018) | 7.7km |
Location: This lode tin occurrence is located at about 200 feet elevation on the low divide between First Chance and Sarah Creeks. First Chance Creek is the small west tributary located 0.75 miles upstream from the mouth of Cape Creek (TE006) at Tin City on the Bering Sea coast. This location was not included separately by Cobb and Sainsbury (1972) or Cobb (1975).
Geology: Felsic dikes to 100 feet wide cross cut Mississippian marble (Sainsbury, 1972) on the low divide between First Chance and Sarah Creeks (Mulligan, 1966, p. 22). Detrital cassiterite mapping suggests that the area containing the dikes is a source of at least some of the placer cassiterite recovered from First Chance Creek (Mulligan, 1966, p. 21). A 175 foot-long dozer trench was opened across one of these dikes. Composite samples from this trench all indicate low but anomalous tin concentrations of 0.01 to 0.06 % (Mulligan, 1966, p. 31). The sample descriptions suggest that the dike is altered, primarily near its contacts where oxidation and clay development is noted. Marine transgressions may have influenced the lower pay streak on nearby Cape Creek (Hudson and Reed, 1997, p. 451-452) and possibly First Chance Creek (TE007). This lode occurrence is at an elevation of 200 feet which is above the highest level of marine deposits that are known in Cape Creek. (TE006). However, this occurrence is located on a marine terrace surface that has a shoreline angle elevation of about 500 feet in this area. The degree to which this higher sea level stand may have influenced the distribution of detrital cassiterite in the First Chance and Cape Creek areas is not known.
Workings: A 175 foot-long dozer trench crosscuts a 100 foot-wide felsic dike at one location. Detrital cassiterite mapping has been completed in the First Chance Creek drainage (Mulligan, 1966).
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: Oxidation and clay development have been noted in the felsic dike.
Reserves: Not defined, identified grades are low
Commodities (Major) - Sn
Development Status: None
Deposit Model: Lode tin occurrence (generally related to tin vein model of Cox and Singer, 19
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: | TE010 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Brooks-Seward DomainDomain
- Nome ComplexAccretionary Complex
This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to
visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders
for access and that you are aware of all safety precautions necessary.
