Unnamed Occurrence (ARDF - MH030; tributary to West Fork Maclaren River), Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 20' 26'' North , 146° 44' 9'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is at an elevation of about 4,000 feet in a northeast-flowing part of a west tributary of the West Fork Maclaren River, near the center of section 23, T. 18 S., R. 5 E., Fairbanks Meridian. It corresponds to locality A30 of Kurtak and others (1992).
Geology: The area of the occurrence is underlain by schist and amphibolite probably formed during metamorphism of Cretaceous age (Nokleberg and others, 1982). Zinc contained in a mineral (probably sphalerite or an oxidation product) occurs in a breccia zone 5 to 15 feet wide (Nokleberg and others, 1990). Four samples of breccia contained between 0.12 and 0.18 percent zinc (Kurtak and others, 1992).
Workings: Surface samples of mineralized breccia contain from 0.12 to 0.18 percent zinc (Kurtak and others, 1992).
Age: Probably Late Cretaceous or younger; mineralized host breccia postdates Cretaceous (?) metamorphism.
Alteration: Possible oxidation of zinc mineral.
Commodities (Major) - Zn
Development Status: None
Deposit Model: Zinc-bearing fault zone.
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
1 valid mineral.
Detailed Mineral List:
| ⓘ Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Sphalerite | ZnS |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
Other Databases
| Link to USGS - Alaska: | MH030 |
|---|
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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