Unnamed Occurrence (ARDF - TK021; near Clark Creek), Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - TK021; near Clark Creek) | - not defined - |
| Valdez Creek Mining District | Mining District |
| Matanuska-Susitna Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 57' 15'' North , 148° 38' 42'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Cantwell | 219 (2011) | 51.0km |
Location: This occurrence is at an elevation of about 4,500 feet on the northeast side of Clark Creek; it is about 0.4 mile northwest of the top of hill 4823 and about 0.4 mile north of the center of sec. 14, T. 33 N., R. 6 W. of the Seward Meridian. The location is accurate to within 1/4 mile.
Geology: This occurrence is a gossan of orange soil that consists of silicified and quartz-pyrite-veined aplite with iron- and manganese-oxide staining; chalky, altered leucogranodiorite; and biotite granodiorite with iron-oxide-coated fractures (J. Schmidt, written commun., 2001). U.S. Geological Survey samples of the aplite contain up to 26.6 parts per million silver, 18,900 parts per million zinc, 1,660 parts per million lead, 1,480 parts per million copper, 126 parts per million cadmium, 15 parts per million bismuth, and 0.2 part per million gold. (The 0.2-part-per-million gold value is from an ICP analysis done by XRAL Laboratories; a fire assay of the same sample shows 0.020 part per million gold. The cause of the discrepancy is not known.)
Workings: Only surface sampling by U.S. Geological Survey (J. Schmidt, written commun., 2001).
Alteration: The leucogranodiorite is altered to clay and the aplite is silicified. Local iron- and manganese-oxide staining.
Commodities (Major) - Ag, Cu, Pb, Zn; (Minor) - Au, Bi, Cd
Development Status: None
Deposit Model: Polymetallic veins? (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.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | 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 | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
Other Databases
| Link to USGS - Alaska: | TK021 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Chulitna-Broad Pass DomainDomain
- Yukon-TananaVolcanic Arc
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