Kusk; Forlorn Hills Prospect, Bristol Bay Mining District, Dillingham Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Kusk; Forlorn Hills Prospect | Prospect |
| Bristol Bay Mining District | Mining District |
| Dillingham Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
60° 16' 10'' North , 157° 46' 1'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Location: This prospect is on an isolated upland south of the middle section of the Salmon River. It is near elevation 2280, about 0.4 mile north of the center of section 15, T. 2 N., R. 49 W.
Geology: A zone of surface rubble about 50 feet long and 10 to 15 feet wide is marked by pieces of quartz-veined stockworks and breccia (Travis Hudson, unpublished field data, 2005). The upland in the area consists of hornfels developed in clastic sedimentary rocks of the Cretaceous Kuskokwim Group; porphyroblastic hornfels with cordierite and/or andalusite porphyroblasts is common. Sparse quartz and quartz-tourmaline veining is locally developed. Intrusive rocks are not exposed on hills 2280, 1866, and 1610. Float from a few-centimeter-thick felsic dike was found at an elevation of about 500 feet on the southwest flank of hill 1750. Cominco Exploration identified cassiterite and high-grade tin values in the quartz breccia.
Workings: Surface examination and rock sampling. This prospect was originally discovered by and staked during a reconnaissance exploration program by Cominco Exploration in the early 1980s.
Age: Probably Early Tertiary, the age of the tin mineralization at the nearby Sleitat Mountain prospect (TA010).
Alteration: Silicification of hornfels.
Commodities (Major) - Sn
Development Status: None
Deposit Model: Quartz vein breccia in hornfels.
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
2 valid minerals.
Detailed Mineral List:
| ⓘ Cassiterite Formula: SnO2 |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| ⓘ | Cassiterite | 4.DB.05 | SnO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Cassiterite | SnO2 |
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Sn | Tin | |
| Sn | ⓘ Cassiterite | SnO2 |
Other Databases
| Link to USGS - Alaska: | TA030 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell buried DomainDomain
- Koyukuk ArcsVolcanic Arc
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