Paxson's Occurrence, Chistochina Mining District, Valdez-Cordova Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Paxson's Occurrence | Occurrence |
| Chistochina Mining District | Mining District |
| Valdez-Cordova Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
63° 2' 13'' North , 145° 33' 50'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Location: This occurrence is at an elevation of 3,500 feet on the northeast flank of Paxson Mountain, 1 mile west of Mud Lake. It is on the steep east slope of an abandoned glacial stream channel in the NW1/4SW1/4 section 1, T. 22 S., R. 11 E., Fairbanks Meridian. The occurrence corresponds to locality 3 in Rose and Saunders (1965) and locality S93 in table 2 of Nokleberg and others (1991). It may be the prospect referred to by Martin (1920).
Geology: Chrysocolla and chalcocite occur in highly vesicular, purplish-brown metabasalt of the Nikolai Greenstone of Late Triassic age (Rose and Saunders, 1965). The chrysocolla and chalcocite are most abundant near a fracture or fault at the north side of the exposure and appear to die out near the south side of the vesicular zone. The mineralized zone strikes N75E and dips about 35NW. Faulting apparently truncates the mineralized rock at both the north and south sides of the exposure. A chip sample across a thickness of 10 feet of the mineralized zone assayed 6.9 percent copper but no gold or silver (Rose and Saunders, 1965).
Workings: This occurrence has been prospected by hand-dug pits. A chip sample across a thickness of 10 feet of the mineralized zone assayed 6.9 percent copper but no gold or silver (Rose and Saunders, 1965). The grade is encouraging, but the mineralization appears to be limited in every direction except into the hillside.
Age: Late Triassic or Cretaceous.
Alteration: The vesicular basalt host rock is altered to chlorite and epidote; copper mineral(s) are oxidized.
Commodities (Major) - Cu
Development Status: None
Deposit Model: Basaltic Cu (Cox and Singer, 1986; 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
2 valid minerals.
Detailed Mineral List:
| ⓘ Chalcocite Formula: Cu2S |
| ⓘ Chrysocolla Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcocite | 2.BA.05 | Cu2S |
| Group 9 - Silicates | |||
| ⓘ | Chrysocolla | 9.ED.20 | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| O | Oxygen | |
| O | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| Al | Aluminium | |
| Al | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| Si | Silicon | |
| Si | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| S | Sulfur | |
| S | ⓘ Chalcocite | Cu2S |
| Cu | Copper | |
| Cu | ⓘ Chalcocite | Cu2S |
| Cu | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
Other Databases
| Link to USGS - Alaska: | MH201 |
|---|
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