Unnamed Occurrence (ARDF - MG080; on tributary valley to Happy River), McGrath Mining District, Bethel Census Area, Alaska, USAi
Regional Level Types | |
---|---|
Unnamed Occurrence (ARDF - MG080; on tributary valley to Happy River) | - not defined - |
McGrath Mining District | Mining District |
Bethel Census Area | Census Area |
Alaska | State |
USA | Country |
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
62° 11' 13'' North , 153° 1' 8'' West
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
201166
Long-form identifier:
mindat:1:2:201166:3
GUID (UUID V4):
5672bed9-4a03-446c-b0d2-e705a4514a2e
Location: This unnamed occurrence is located on a steep, west-facing slope of a tributary valley to the Happy River. It is at about 4 kilometers southeast of Rainy Pass, at an elevation of 4,400 feet (1,341 m), in the NE1/4 sec. 7, T. 24 N., R. 20 W., of the Seward Meridian. The reporter visited the site in 1988; at station no. 88BT205.
Geology: This unnamed occurrence consists of a chalcopyrite-bearing quartz vein in the contact aureole of a small composite hornblende-rich, granodiorite pluton that intrudes Lower Cretaceous Kahiltna Flysch (Bundtzen, Harris, and Gilbert, 1997). The undated pluton contains monzonite, granodiorite, and syenite phases with granodiorite predominates. The small intrusion covers an area of 100 meters by 200 meters; however, a 125 meter wide thermal aureole surrounds the intrusion, which suggests an enlarged body at depth. Chalcopyrite-bearing quartz veins occur in the thermal aureole near the contact with the pluton. Chalcopyrite comprises no more than one percent of the total sulfides, which are dominated by pyrite. Three samples taken of the sulfide-vein mineralization contained an average 180 ppm tungsten, 200 ppm arsenic, and 250 ppm gold. The samples were not run for either lead or copper.
Workings: The reporter mapped the pluton as part of a Division of Geological and Geophysical Surveys mapping effort in 1988 (Bundtzen, Harris, and Gilbert, 1997). Three samples taken of sulfide-vein mineralization contained an average 180 ppm tungsten, 200 ppm arsenic, and 250 ppm gold. The samples were not analyzed for lead or copper.
Alteration: Sericite in intrusion.
Reserves: None.
Commodities (Major) - As, W; (Minor) - Au
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 | |||
---|---|---|---|
ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
ⓘ | 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 | ⓘ Pyrite | FeS2 |
Fe | Iron | |
Fe | ⓘ Chalcopyrite | CuFeS2 |
Fe | ⓘ Pyrite | FeS2 |
Cu | Copper | |
Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Databases
Link to USGS - Alaska: | MG080 |
---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Farewell buried DomainDomain
This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to
visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders
for access and that you are aware of all safety precautions necessary.