Unnamed Occurrences (ARDF - MC056; east of head of Dry Creek), Chistochina Mining District, Valdez-Cordova Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
61° 34' 42'' North , 143° 54' 25'' West
Latitude & Longitude (decimal):
Köppen climate type:
The locality is in the Wrangell-Saint Elias National Park and Preserve.
Location: These occurrences are on the ridge east of the head of Dry Creek. The coordinates for this record is based on is locality 29 of MacKevett and others (1978). This occurrence is at an elevation of about 5,050 feet, 700 feet north of the center of section 26, T. 3 S., R. 8 E. of the Copper River Meridian. This record includes localities 141 and 142 of MacKevett (1976).
Geology: At least two occurrences of copper-bearing minerals in Triassic Nikolai Greenstone have been identified in this area (localities 141 and 142 of MacKevett, 1976). At locality 141, a sample of amygdaloidal greenstone contained 1,500 parts per million copper and may contain some native copper. At locality 142, bornite and malachite occur in several subparallel thin veins and veinlets cutting greenstone. The widespread deposition of copper in Triassic greenstone and limestone of the area is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic or Early Cretaceous (MacKevett and others, 1997). Copper-bearing minerals were deposited in the underlying Nikolai Greenstone at about 112 Ma (Silberman and others, 1980).
Workings: Only limited surface sampling.
Age: Cretaceous? The widespread deposition of copper in Triassic greenstone and limestone of the area is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic or Early Cretaceous (MacKevett and others, 1997). Copper-bearing minerals were deposited in the underlying Nikolai Greenstone at about 112 Ma (Silberman and others, 1980).
Alteration: Oxidation.
Commodities (Major) - Cu
Development Status: None
Deposit Model: Basaltic Cu (Cox and Singer, 1980; model 23)
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:
| ⓘ Bornite Formula: Cu5FeS4 |
| ⓘ Malachite Formula: Cu2(CO3)(OH)2 |
| ⓘ Native Copper Formula: Cu |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Copper | 1.AA.05 | Cu |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Bornite | 2.BA.15 | Cu5FeS4 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Malachite | Cu2(CO3)(OH)2 |
| C | Carbon | |
| C | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | Oxygen | |
| O | ⓘ Malachite | Cu2(CO3)(OH)2 |
| S | Sulfur | |
| S | ⓘ Bornite | Cu5FeS4 |
| Fe | Iron | |
| Fe | ⓘ Bornite | Cu5FeS4 |
| Cu | Copper | |
| Cu | ⓘ Bornite | Cu5FeS4 |
| Cu | ⓘ Native Copper | Cu |
| Cu | ⓘ Malachite | Cu2(CO3)(OH)2 |
Other Databases
| Link to USGS - Alaska: | MC056 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Wrangell MountainsMountain Range
North America PlateTectonic Plate
- Wrangellia DomainVolcanic Arc
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