Unnamed Occurrence (ARDF - MH037; on peak 5480 southeast of Clearwater Creek), Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 12' 33'' North , 146° 53' 34'' West
Latitude & Longitude (decimal):
KΓΆppen climate type:
Mindat Locality ID:
201185
Long-form identifier:
mindat:1:2:201185:4
GUID (UUID V4):
d0879736-54d8-4276-b57f-cd80f6247498
Location: This occurrence is near the top of peak 5480 near the center of section 1, T. 20 S., R. 4 E., Fairbanks Meridian. It corresponds to locality 8 in table 2 of Nokleberg and others (1991) and is about the same as a site sampled by Anaconda Minerals Company (Ellis, 1980). A probably related site is locality 20 of Clautice and others (1989), which is about one-quarter mile southeast of peak 5480 on the ridge crest.
Geology: The rock near the occurrence is muscovite schist, probably metarhyolite. The rocks are cut by low-angle (thrust) faults (Nokleberg and others, 1991). The deposit is a polymetallic vein rich in lead. Sample 82NK017C collected by the U.S. Geological Survey assayed 9.4 percent lead, 0.97 percent zinc, 0.27 percent copper, 47 parts per million (ppm) silver, and 15 ppm molybdenum (Nokleberg and others, 1991). A sample collected by Anaconda Minerals Company assayed 1.17 percent lead, 0.1 percent zinc, 0.305 percent copper, and 86 ppm molybdenum (Ellis, 1980). Similar mineralization was reported at a nearby site by Clautice and others (1989, their locality 20), where more than 1 percent lead, 0.52 percent zinc, and 0.26 percent copper occurred in a zone 2 to 3 inches wide in tuffaceous rock.
Workings: No extensive workings.
Age: The lead-rich vein deposit cuts muscovite schist of probable Paleozoic protolith age. The mineralization age is uncertain but possibly Cretaceous, related to widespread deformation that occurred at that time.
Commodities (Major) - Ag, Pb, Zn; (Minor) - Cu, Mo
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
5 valid minerals.
Detailed Mineral List:
| β Galena Formula: PbS |
| β Malachite Formula: Cu2(CO3)(OH)2 |
| β Pyrite Formula: FeS2 |
| β Quartz Formula: SiO2 |
| β Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| β | Sphalerite | 2.CB.05a | ZnS |
| β | Galena | 2.CD.10 | PbS |
| β | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| β | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| β | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | β Malachite | Cu2(CO3)(OH)2 |
| C | Carbon | |
| C | β Malachite | Cu2(CO3)(OH)2 |
| O | Oxygen | |
| O | β Malachite | Cu2(CO3)(OH)2 |
| O | β Quartz | SiO2 |
| Si | Silicon | |
| Si | β Quartz | SiO2 |
| S | Sulfur | |
| S | β Galena | PbS |
| S | β Pyrite | FeS2 |
| S | β Sphalerite | ZnS |
| Fe | Iron | |
| Fe | β Pyrite | FeS2 |
| Cu | Copper | |
| Cu | β Malachite | Cu2(CO3)(OH)2 |
| Zn | Zinc | |
| Zn | β Sphalerite | ZnS |
| Pb | Lead | |
| Pb | β Galena | PbS |
Other Databases
| Link to USGS - Alaska: | MH037 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Wrangellia DomainDomain
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References
