Unnamed Occurrence (ARDF - MG076; overlooking headwaters of Jones River), Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - MG076; overlooking headwaters of Jones River) | - not defined - |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 28' 4'' North , 153° 10' 8'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This unnamed occurrence is located on a flattened, south-facing spur overlooking the headwaters of the Jones River; it is at an elevation of 5,200 feet (1,585 m) in the SE1/4 sec. 33, T. 28 N., R. 21 W., of the Seward Meridian. The reporter visited the site in 1984; at station nos. 84BT104 and 84BT147.
Geology: This unnamed occurrence consists of a mineralized quartz-carbonate breccia zone in a small composite pluton of Late Cretaceous (79 Ma) age (Solie and others, 1991). The pluton averages diorite in composition; it covers an equant, one square kilometer area, and intrudes the sandstone, siltstone, and silty limestone of the mid-Silurian Terra Cotta Mountains Sandstone, a unit of the Dillinger subterrane (Bundtzen, Harris, and Gilbert, 1997). The deposit consists of disseminated chalcopyrite, pyrite, and a trace of galena in an intrusive hosted, quartz-carbonate breccia. Total sulfides amount to no more than 1 percent of the total mineralized zone. No surface measurements of the mineralized area are available. No assay data is available. Metallic content is based on field identification of sulfide minerals.
Workings: The reporter examined the site in 1984. No assay data is available. Metallic content is based on field identification of sulfide minerals.
Alteration: Extensive carbonate alteration.
Reserves: None.
Commodities (Major) - Cu; (Minor) - Pb
Development Status: No
Deposit Model: Polymetallic replacement(?) (Cox and Singer, 1986; model 19a).
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
4 valid minerals.
Detailed Mineral List:
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Galena Formula: PbS |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Galena | PbS |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS - Alaska: | MG076 |
|---|
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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