Unnamed Occurrence (ARDF - GU004; on hill 4890 east of VABM Keg), Chistochina Mining District, Valdez-Cordova Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
62° 47' 27'' North , 146° 12' 17'' West
Latitude & Longitude (decimal):
Köppen climate type:
Outcrops are mostly limited to ridge crests; hill slopes below about 3,500 feet in elevation are mostly covered with gravel and have thick brush mats. Additional information can be obtained from Ahtna Minerals in Anchorage, Alaska.
Location: The occurrence is near the crest of hill 4890 about 2.5 miles east of VABM Keg. It is in the NE1/4SW1/4, section 29, T. 12 N., R. 5 W., Copper River Meridian. The occurrence is located accurately within 1000 feet.
Geology: The occurrence is in schistose, andesitic to basaltic, volcanic rocks, tentatively correlated with the Pennsylvanian to Permian, Tetelna Formation. Numerous occurrences of chalcocite partly oxidized to azurite and malachite occur in the section (Arehart, 1982, p. 3). This locality is Arehart's sample 2308 which contained more than 2 percent copper and 50 ppm silver. The sample was high-grade material; there are also probably numerous additional small copper occurrences in the vicinity.
Workings: The occurrence was found in 1981 during regional reconnaissance by Noranda Inc. on Ahtna Inc., regional Native corporation lands.
Age: Remobilization of copper may have occurred during green-schist metamorphism in the Jurassic(?).
Alteration: Local introduction of epidote.
Commodities (Major) - Ag, Cu
Development Status: None
Deposit Model: Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
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:
| ⓘ Azurite Formula: Cu3(CO3)2(OH)2 |
| ⓘ Chalcocite Formula: Cu2S |
| ⓘ Malachite Formula: Cu2(CO3)(OH)2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcocite | 2.BA.05 | Cu2S |
| 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 |
| S | Sulfur | |
| S | ⓘ Chalcocite | Cu2S |
| Cu | Copper | |
| Cu | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| Cu | ⓘ Chalcocite | Cu2S |
| Cu | ⓘ Malachite | Cu2(CO3)(OH)2 |
Other Databases
| Link to USGS - Alaska: | GU004 |
|---|
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