Round Occurrence, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Round Occurrence | Occurrence |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 53' 27'' North , 155° 39' 54'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| McGrath | 344 (2017) | 8.1km |
Location: The Round occurrence is situated about 40 meters north of VABM Round at an elevation of 1,550 feet (472 m) in the NW1/4 sec. 4, T. 32 N., R. 43 W., of the Seward Meridian. The reporter visited the site in 1978.
Geology: The Round occurrence consists of an iron-stained quartz-epidote stockwork in hornfels of the Late Cretaceous Kuskokwim Group flysch (Bundtzen and Laird, 1983). The occurrence is poorly exposed and mainly observed in talus and rubble crop. No surface dimensions were measured, and its extent is unknown. Selected surface samples contain up to 5.43 grams/tonne silver and 99 ppm copper (Bundtzen and Laird, 1983).
Workings: Selected surface samples contain up to 5.43 g/tonne silver, and 99 ppm copper (Bundtzen and Laird, 1983).
Alteration: None.
Reserves: None.
Commodities (Major) - Ag; (Minor) - Cu
Development Status: No
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c).
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.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 9 - Silicates | |||
| ⓘ | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | Oxygen | |
| O | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | ⓘ Quartz | SiO2 |
| Al | Aluminium | |
| Al | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | Silicon | |
| Si | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | ⓘ Quartz | SiO2 |
| Ca | Calcium | |
| Ca | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | Iron | |
| Fe | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Other Databases
| Link to USGS - Alaska: | MG006 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell buried DomainDomain
- Farewell TerranePassive Margin
- Minchumina BasinBasin
USA
- Alaska
- Yukon-Koyukuk Census Area
- McGrath Mining DistrictMining District
- Yukon-Koyukuk Census Area
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