Unnamed Occurrence (ARDF - MH198; north flank of Paxson Mountain), Chistochina Mining District, Valdez-Cordova Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 5' 4'' North , 145° 37' 47'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is at an elevation of about 3,650 feet on the north flank of Paxson Mountain. It is approximately one-half mile south of the Denali Highway in the SW1/4NW1/4 section 22, T. 21 S., R. 11 E., Fairbanks Meridian. This location corresponds to locality 8 in Rose and Saunders (1965) and locality S90 in table 2 of Nokleberg and others (1991).
Geology: An area about 20 feet long and 2 to 3 feet high on a cliff face in a gorge is coated with chrysocolla and malachite (Rose and Saunders, 1965). The coating is due to oxidation of minor bornite in the country rock, which is vesicular metabasalt of Nikolai Greenstone of Late Triassic age. A light-colored hornblende-andesite dike intrudes metabasalt a few hundred feet west of the occurrence. The dike and the mineralization at this occurrence are in line with the strike of the bornite veinlets at MH197 (Rose and Saunders, 1965).
Workings: Copper-bearing float occurs in a gully a few tens of feet north of the mineralized outcrop, and an old (pre-1960?) claim post and stakes are at the top of the cliff (Rose and Saunders, 1965). Traces of copper were also found on the opposite side of the gorge.
Age: Probably Late Triassic.
Alteration: The metabasalt host rock is altered to chlorite and epidote; oxidation of copper mineral(s) is also present.
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
3 valid minerals.
Detailed Mineral List:
| ⓘ Bornite Formula: Cu5FeS4 |
| ⓘ Chrysocolla Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| ⓘ Malachite Formula: Cu2(CO3)(OH)2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Bornite | 2.BA.15 | Cu5FeS4 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
| 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 |
| H | ⓘ Malachite | Cu2(CO3)(OH)2 |
| C | Carbon | |
| C | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | Oxygen | |
| O | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| O | ⓘ Malachite | Cu2(CO3)(OH)2 |
| 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 | ⓘ Bornite | Cu5FeS4 |
| Fe | Iron | |
| Fe | ⓘ Bornite | Cu5FeS4 |
| Cu | Copper | |
| Cu | ⓘ Bornite | Cu5FeS4 |
| Cu | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| Cu | ⓘ Malachite | Cu2(CO3)(OH)2 |
Other Databases
| Link to USGS - Alaska: | MH198 |
|---|
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