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Unnamed Occurrence (ARDF - MH279; on ridge between Chistochina Glacier and glacier near the head of West Fork Chistochina River), Chistochina Mining District, Southeast Fairbanks Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 10' 49'' North , 144° 56' 56'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: The occurrence is on the ridge between the Chistochina River and the glacier at the head of the West Fork Chistochina River, about 3 miles north of their confluence; it is at an elevation of about 5,400 feet. The occurrence is about 0.1 mile southwest of the center of section 18, T. 20 S., R. 15 E., Fairbanks Meridian. The occurrence corresponds to locality 10 on figure 2 of Rose (1967) and locality 130 in table 2 of Nokleberg and others (1991); the location is probably accurate within 1,000 feet.
Geology: The rocks in vicinity of this occurrence are dacite and andesite of the Chisna Formation (Rose, 1967). The rocks possibly belong to the Tetelna Volcanics or Slana Spur Formation of Richter and Dutro (1975). A north-trending dike of quartz monzonite that can be traced for about 2 miles cuts the volcanic rocks. Float fragments of dacite and andesite are stained with azurite and malachite (Rose, 1967; Nokleberg and others, 1991). A grab sample from the locality contained 5 parts per million silver. Two nearby occurrences, MH280 and MH281, are also in volcanic wall rocks near the quartz monzonite dike.
Workings: Only limited surface sampling and geologic mapping.
Age: Possibly related to the Pennsylvanian to Permian volcanic rocks or related to the Mesozoic quartz monzonite.
Commodities (Major) - Cu; (Minor) - Ag
Development Status: None
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 5 - Nitrates and Carbonates | |||
|---|---|---|---|
| ⓘ | Azurite | 5.BA.05 | Cu3(CO3)2(OH)2 |
| ⓘ | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| H | ⓘ Malachite | Cu2(CO3)(OH)2 |
| C | Carbon | |
| C | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| C | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | Oxygen | |
| O | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| O | ⓘ Malachite | Cu2(CO3)(OH)2 |
| Cu | Copper | |
| Cu | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| Cu | ⓘ Malachite | Cu2(CO3)(OH)2 |
Other Databases
| Link to USGS - Alaska: | MH279 |
|---|
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