Unnamed Occurrence (ARDF - LH022; head of South Fork Kuskokwim River), McGrath Mining District, Bethel Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - LH022; head of South Fork Kuskokwim River) | - not defined - |
| McGrath Mining District | Mining District |
| Bethel Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
61° 31' 5'' North , 153° 28' 47'' West
Latitude & Longitude (decimal):
KΓΆppen climate type:
Mindat Locality ID:
201009
Long-form identifier:
mindat:1:2:201009:3
GUID (UUID V4):
a8b16faa-c700-4f2f-a20b-8746499b1e54
Location: This occurrence is at an elevation of about 4,800 feet on the south side of a glacier that occupies the central headwater tributary of the South Fork Kuskokwim River. The map site is in the SE1/4 section 32, T 17 N, R 23 W, of the Seward Meridian. This is locality 8 of Cobb (1972 [MF 412]; 1976 [OF 76-485]) and locality 24 of Gamble and others (1989). The location is probably accurate to within a quarter of a mile.
Geology: Reed and Elliott (1970) reported finding two sulfide-bearing boulders at this locality. The boulders are of Tertiary quartz diorite and diorite gneiss (Cobb and Reed, 1981). The quartz diorite boulder contained quartz-tourmaline veins carrying 15 percent chalcopyrite and 5 percent pyrite. The diorite gneiss boulder contained tourmaline and 15 percent disseminated chalcopyrite. Rock samples contained as much as 50 ppm silver, 700 ppm molybdenum, 700 ppm tin, and 0.7 ppm gold.
Workings: Reconnaissance sampling has been completed in this area (Reed and Elliott, 1970).
Age: Tertiary. Quartz veins and mineralization crosscut Tertiary intrusive rocks.
Alteration: Quartz-tourmaline veining and replacement(?).
Commodities (Major) - Ag, Cu, Mo, Sn
Development Status: None
Deposit Model: Polymetallic veins and porphyry Cu ? (Cox and Singer, 1986, models 22c and 21a?
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:
| β Chalcopyrite Formula: CuFeS2 |
| β Pyrite Formula: FeS2 |
| β Quartz Formula: SiO2 |
| β 'Tourmaline' Formula: AD3G6 (T6O18)(BO3)3X3Z |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| β | Chalcopyrite | 2.CB.10a | CuFeS2 |
| β | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| β | Quartz | 4.DA.05 | SiO2 |
| Unclassified | |||
| β | 'Tourmaline' | - | AD3G6 (T6O18)(BO3)3X3Z |
List of minerals for each chemical element
| B | Boron | |
|---|---|---|
| B | β Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
| O | Oxygen | |
| O | β Quartz | SiO2 |
| O | β Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
| Si | Silicon | |
| Si | β Quartz | SiO2 |
| S | Sulfur | |
| S | β Chalcopyrite | CuFeS2 |
| S | β Pyrite | FeS2 |
| Fe | Iron | |
| Fe | β Chalcopyrite | CuFeS2 |
| Fe | β Pyrite | FeS2 |
| Cu | Copper | |
| Cu | β Chalcopyrite | CuFeS2 |
Other Databases
| Link to USGS - Alaska: | LH022 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Farewell buried DomainDomain
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References
