Unnamed Occurrence (ARDF - MG079; on tributary to Dalzell Creek), McGrath Mining District, Bethel Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - MG079; on tributary to Dalzell Creek) | - not defined - |
| McGrath Mining District | Mining District |
| Bethel Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 14' 13'' North , 153° 15' 25'' West
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
201165
Long-form identifier:
mindat:1:2:201165:6
GUID (UUID V4):
6d25563d-92e2-4339-ab6d-22198248145b
Location: This unnamed occurrence is located on a rugged north-facing spur of a tributary valley of Dalzell Creek at an elevation of 4,600 feet (1,402 m) in the SE1/4 sec. 24, T. 25 N., R. 22 W., of the Seward Meridian. The reporter sampled the site in 1988; at station no. 88BT177.
Geology: This unnamed occurrence is a low sulfide-quartz vein that intrudes sandstone of the Lower Cretaceous Kahiltna Flysch (Bundtzen, Harris, and Gilbert, 1997). The vein strikes approximately N70E for a distance of about 110 meters, and averages about 0.5 meters wide. Disseminated arsenopyrite and pyrite comprise about 1 percent of the vein volume. One grab sample of the vein contained 1,600 ppm arsenic, 150 ppb gold, and 55 ppm antimony.
Workings: The reporter investigated the site during a geological mapping program for the Alaska Division of Geological and Geophysical Surveys in 1988 (Bundtzen, Harris, and Gilbert, 1997). One grab sample of sulfide-bearing vein material contained 1,600 ppm arsenic, 150 ppb gold, and 55 ppm antimony.
Alteration: None.
Reserves: None.
Commodities (Major) - As, Au; (Minor) - Sb
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
3 valid minerals.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
| 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 | ⓘ Arsenopyrite | FeAsS |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Arsenopyrite | FeAsS |
| Fe | ⓘ Pyrite | FeS2 |
| As | Arsenic | |
| As | ⓘ Arsenopyrite | FeAsS |
Other Databases
| Link to USGS - Alaska: | MG079 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Farewell-McGrath DomainDomain
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References
