Bradley Scheelite; Bird Creek Prospect, Yentna Mining District, Matanuska-Susitna Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Bradley Scheelite; Bird Creek Prospect | Prospect |
| Yentna Mining District | Mining District |
| Matanuska-Susitna Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 34' 55'' North , 150° 57' 14'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Placer workings downstream in Bird Creek (TL040) are likely derived, at least in part, from this occurrence.
Location: C.C. Hawley and Associates, Inc. (1978, Fig. 4.2-B(3)) locate this prospect on a tributary of Bird Creek in the southwest quarter of Section 22, T. 29 N., R. 9 W., of the Seward Meridian.
Geology: At this locality northeast-striking felsite dikes of Tertiary age cut a sequence of Mesozoic graywacke and argillite (KJs) (C.C. Hawley and Associates, Inc., 1978; Reed and Nelson, 1980). Thin (one-half inch to three inches wide) ladder-type arsenopyrite-scheelite-quartz veins that contain free gold run parallel to the dikes (Reed and others, 1978). Clark and Hawley (1968, p. 41, samples 208 and 210) report 103 ppm gold in a 3-inch-wide arsenopyrite vein; 28.0 ppm gold and 100 ppm tungsten in a 1-inch-wide quartz-arsenopyrite vein. Placer workings downstream in Bird Creek (TL040) are likely derived, at least in part, from this occurrence.
Workings: Reconnaissance mapping, stream silt and rock sampling by the U.S. Geological Survey (Clark and Hawley,1968; Reed and Nelson, 1980) and by C.C. Hawley and Associates, Inc. (1978) have been completed in this area. They report that 600 to 800 lb. of scheelite-bearing float was removed from the site by the late Shorty Bradley.
Age: Tertiary; mineralization is interpreted to be related to the felsite dikes that are described as Tertiary in age by Clark and Hawley (1968).
Production: 600 to 800 pounds of scheelite-bearing float were removed from the site by the late Shorty Bradley (C.C. Hawley and Associates, Inc., 1978).
Commodities (Major) - Au, W
Development Status: None
Deposit Model: Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a).
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:
| ⓘ Arsenopyrite Formula: FeAsS |
| ⓘ Native Gold Formula: Au |
| ⓘ Scheelite Formula: Ca(WO4) |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Scheelite | 7.GA.05 | Ca(WO4) |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Scheelite | Ca(WO4) |
| S | Sulfur | |
| S | ⓘ Arsenopyrite | FeAsS |
| Ca | Calcium | |
| Ca | ⓘ Scheelite | Ca(WO4) |
| Fe | Iron | |
| Fe | ⓘ Arsenopyrite | FeAsS |
| As | Arsenic | |
| As | ⓘ Arsenopyrite | FeAsS |
| W | Tungsten | |
| W | ⓘ Scheelite | Ca(WO4) |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS - Alaska: | TL038 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell buried DomainDomain
- Farewell ForedeepForedeep Basin
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