Eudialyte Prospect, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Eudialyte Prospect | Prospect |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 3' 50'' North , 154° 5' 2'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
The Eudialyte Prospect is a likely area for discovery of specimen-quality, eudialyte and other REE-bearing minerals.
Location: The Eudialyte Prospect is located on a steep, northwest-facing promontory within a north flowing unnamed tributary of the Middle Fork of the Kuskokwim River, at an elevation of 3,950 feet (1,204 m) in the SW1/4 sec. 20, T. 23 N., R. 26 W., of the Seward Meridian. The reporter visited the site in 1982.
Geology: The Eudialyte Prospect consists of thin (3-10 centimeter thick), uranium and thorium-enriched veins in mainly coarse talus of a eudialyte-bearing hornblende diorite dike that intrudes into the contact zone between the Windy Fork peralkaline granite complex and Dillinger subterrane clastic rocks (Gilbert and others, 1988; Bundtzen, Harris, and Gilbert, 1997). The eudialyte-bearing dike averages about one meter thick and can be traced for about 90 meters along strike. The Dillinger subterrane lithologies in the prospect area are Silurian whereas the Windy Fork pluton has been dated at 25 Ma (Solie and others, 1991). Pink eudialyte, a zirconium-enriched REE mineral, and thorite occur as disseminations and blebs in a coarse grained hornblende-rich diorite dike that displays a distinct foliated-flow texture. Reed and Miller (1980) reported values of 33.3 ppm uranium and 46.3 ppm thorium at the Eudialyte prospect.
Workings: Reed and Miller (1980) first reported the existence of eudialyte, radioactive minerals and anomalous uranium and thorium values near the contact zone of the Windy Fork peralkaline granite complex. The site was later described by Gilbert and others (1988), Gunter and others (1993), and Bundtzen, Harris, and Gilbert (1997), who reported locally abundant pink eudialyte, a zirconium-enriched REE mineral, in foliated hornblende-rich diorite. Reed and Miller (1980) reported values of 33.3 ppm uranium and 46.3 ppm thorium from grab samples at the prospect.
Age: Late Tertiary (25 Ma), based on K-Ar age of Windy Fork pluton.
Alteration: None.
Production: Some eudialyte crystals have been collected as mineral specimens by various individuals since 1982.
Reserves: Eudialyte-bearing dike is of a small size.
Commodities (Major) - REE, Zr; (Minor) - Th, U
Development Status: No
Deposit Model: Thorium-Rare Earth Veins (Cox and Singer, 1986; model 11b).
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
3 valid minerals.
Detailed Mineral List:
| ⓘ Eudialyte Formula: Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2 |
| ⓘ 'Hornblende Root Name Group' Formula: ◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2 |
| ⓘ Ilmenite Formula: Fe2+TiO3 |
| ⓘ 'K Feldspar' |
| ⓘ Thorite Formula: Th(SiO4) |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Ilmenite | 4.CB.05 | Fe2+TiO3 |
| Group 9 - Silicates | |||
| ⓘ | Thorite | 9.AD.30 | Th(SiO4) |
| ⓘ | Eudialyte | 9.CO.10 | Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2 |
| Unclassified | |||
| ⓘ | 'Hornblende Root Name Group' | - | ◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2 |
| ⓘ | 'K Feldspar' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Eudialyte | Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2 |
| H | ⓘ Hornblende Root Name Group | ◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2 |
| O | Oxygen | |
| O | ⓘ Eudialyte | Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2 |
| O | ⓘ Ilmenite | Fe2+TiO3 |
| O | ⓘ Thorite | Th(SiO4) |
| O | ⓘ Hornblende Root Name Group | ◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2 |
| F | Fluorine | |
| F | ⓘ Hornblende Root Name Group | ◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2 |
| Na | Sodium | |
| Na | ⓘ Eudialyte | Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2 |
| Al | Aluminium | |
| Al | ⓘ Hornblende Root Name Group | ◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2 |
| Si | Silicon | |
| Si | ⓘ Eudialyte | Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2 |
| Si | ⓘ Thorite | Th(SiO4) |
| Si | ⓘ Hornblende Root Name Group | ◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2 |
| Cl | Chlorine | |
| Cl | ⓘ Eudialyte | Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2 |
| Cl | ⓘ Hornblende Root Name Group | ◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2 |
| Ca | Calcium | |
| Ca | ⓘ Eudialyte | Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2 |
| Ca | ⓘ Hornblende Root Name Group | ◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2 |
| Ti | Titanium | |
| Ti | ⓘ Ilmenite | Fe2+TiO3 |
| Fe | Iron | |
| Fe | ⓘ Eudialyte | Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2 |
| Fe | ⓘ Ilmenite | Fe2+TiO3 |
| Zr | Zirconium | |
| Zr | ⓘ Eudialyte | Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2 |
| Th | Thorium | |
| Th | ⓘ Thorite | Th(SiO4) |
Other Databases
| Link to USGS - Alaska: | MG036 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell-McGrath DomainDomain
- Farewell TerranePassive Margin
USA
- Alaska
- Yukon-Koyukuk Census Area
- McGrath Mining DistrictMining District
- Yukon-Koyukuk Census Area
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