Silverdikes Occurrence, Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Silverdikes Occurrence | Occurrence |
| Valdez Creek Mining District | Mining District |
| Matanuska-Susitna Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
63° 12' 35'' North , 149° 36' 36'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Also see Lookout Mountain (HE032).
Location: The Silverdikes prospect is at an elevation of about 2,900 feet, about 1.7 miles southwest of Lookout Mountain. The map site is in the SW1/4 of sec. 2, T. 20 S., R. 11 W., of the Fairbanks Meridian. The location is accurate to within one mile.
Geology: The Silverdikes prospect is on the Chulitna fault. The country rocks are Upper Jurassic to Upper Triassic crystal tuff, argillite, graywacke, and chert, cut by Upper Cretaceous or Lower Tertiary, fine-grained quartz porphyry dikes. The deposit apparently consists of galena- and sphalerite-bearing quartz veins, but their hostrock is not specified. The dikes contain disseminated pyrite. Geochemically anomalous silver, lead and zinc values are reported (unpublished report, Addwest Minerals International, Ltd, 1997). The Silverdikes prospect closely resembles the deposit at Lookout Mountain (HE032).
Workings: Surface sampling only.
Age: Late Cretaceous or younger.
Alteration: Minor sericitic-phyllic alteration reported.
Commodities (Major) - Ag; (Minor) - Pb, Zn
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
4 valid minerals.
Detailed Mineral List:
| ⓘ Galena Formula: PbS |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | 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 | ⓘ Galena | PbS |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS - Alaska: | HE047 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Chulitna-Broad Pass DomainDomain
- Peninsular TerraneVolcanic Arc
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