Unnamed Prospect (ARDF - MH061; east of West Fork Maclaren River), Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 15' 1'' North , 146° 42' 0'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This prospect is in a cirque at an elevation of about 5,000 feet and about one-quarter mile south of the center of section 24, T. 19 S., R. 5 E., Fairbanks Meridian; it is about one-half mile southwest of peak 5590. This site corresponds to locality 17 on figure 4 of Cobb (1979 [OFR 79-238). The location is accurate within about one-quarter mile.
Geology: The rocks at this occurrence are mafic volcanic rocks of the Nikolai Greenstone of Late Triassic age (Nokleberg and others, 1991). Chalcocite or its oxidation product malachite occurs in quartz-epidote veinlets, in vesicles partly filled with epidote, and on joint or other fracture surfaces of the volcanic rocks (Smith and others, 1973, 1975). Copper is typically accompanied by small amounts of silver.
Workings: The site was found during geochemical appraisal of the area (Smith and others, 1973, 1975).
Age: The copper occurrence is epigenetic to the Nikolai Greenstone of Late Triassic age. It probably formed in Cretaceous or early Tertiary time (see MH060).
Commodities (Major) - Cu; (Minor) - Ag (?)
Development Status: None
Deposit Model: Characteristic epigenetic mineralization of cupriferous volcanic rocks. Basalti
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Chalcocite Formula: Cu2S |
| ⓘ Epidote Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| ⓘ Malachite Formula: Cu2(CO3)(OH)2 |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcocite | 2.BA.05 | Cu2S |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
| Group 9 - Silicates | |||
| ⓘ | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| H | ⓘ Malachite | Cu2(CO3)(OH)2 |
| C | Carbon | |
| C | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | Oxygen | |
| O | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | ⓘ Quartz | SiO2 |
| Al | Aluminium | |
| Al | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | Silicon | |
| Si | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Chalcocite | Cu2S |
| Ca | Calcium | |
| Ca | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | Iron | |
| Fe | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Cu | Copper | |
| Cu | ⓘ Chalcocite | Cu2S |
| Cu | ⓘ Malachite | Cu2(CO3)(OH)2 |
Other Databases
| Link to USGS - Alaska: | MH061 |
|---|
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