Unnamed Occurrence (ARDF - SM039; east valley wall of Kuskokwim River), Aniak Mining District, Bethel Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - SM039; east valley wall of Kuskokwim River) | - not defined - |
| Aniak Mining District | Mining District |
| Bethel Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
61° 38' 31'' North , 158° 15' 10'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Crooked Creek | 105 (2016) | 26.4km |
Location: This occurrence is at the summit of a prominent northeast-trending ridge east of the Kuskokwim River near the eastern boundary of the Sleetmute C-7 quadrangle. The occurrence is at an elevation of about 800 feet and about 0.6 mile north-northeast of the center of sec. 24, T. 18 N., R. 50 W., of the Seward Meridian. The location is accurate.
Geology: This unnamed occurrence consists of thin, conjugate quartz -sulfide veins in a granite porphyry sill. This intrusion has has a 40K/40Ar biotite age of 71.2 Ma (Bundtzen and others, 1998). The conjugate veins, which strike N75E and N55W and dip steeply to vertically, are 0.4 to 1.1 inches thick. The veins consist of quartz with selvages of mica, 0.5 to 1.0 percent arsenopyrite, and other unidentified sulfides. The mineralized area totals about 550 square feet in size and within that area there is an average of about 1 vein per foot. Several grab samples contained up to 148 parts per million (ppm) lead, 52 ppm molybdenum, 2.0 ppm tungsten, and 1.4 ppm mercury (Bundtzen and others, 1998).
Workings: Surface sampling was conducted by the Alaska Division of Geological and Geophysical Surveys in 1987 and 1991 (Bundtzen and others, 1998). During the 1990s, Placer Dome Exploration sampled this occurrence but the results of their study is unknown. The area has been trenched but the trenches were overgrown with vegetation in 1991.
Age: Undated; may be genetically related to the granite-porphyry host rock which has been dated at 71.2 Ma (Bundtzen and others, 1998).
Alteration: White mica (potassic).
Commodities (Major) - As, Mo, Pb; (Minor) - Hg, W
Development Status: None
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
2 valid minerals.
Detailed Mineral List:
| ⓘ Arsenopyrite Formula: FeAsS |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | 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 |
| Fe | Iron | |
| Fe | ⓘ Arsenopyrite | FeAsS |
| As | Arsenic | |
| As | ⓘ Arsenopyrite | FeAsS |
Other Databases
| Link to USGS - Alaska: | SM039 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell buried DomainDomain
- Koyukuk ArcsVolcanic Arc
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