Unnamed Occurrence (ARDF - MH287; west of the terminus of Chistochina Glacier), Chistochina Mining District, Southeast Fairbanks Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 11' 36'' North , 144° 52' 44'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is west of the terminus of the Chistochina Glacier about 4.7 miles northeast of the junction of the Chistochina River and the West Fork Chistochina River. The elevation is about 4,800 feet. The occurrence is in the NW1/4SE1/4 section T. 20 S., R. 15 E., Fairbanks Meridian. It corresponds to locality 11 on figure 6 of Cobb (1979 [OFR 79-238]) and locality 134 in table 2 of Nokleberg and others (1991). The location of the occurrence seems to be that of locality 20 of Rose (1967), but the geology does not appear to fit (see Geologic Description). Thus the location is uncertain. Cobb (1979 [OFR 79-238]) and Nokleberg and others (1991) carry this uncertainty forward.
Geology: Locality 20 of Rose (1967) is in a mile-long northeast-trending body of gabbro and mafic gabbro south of quartz monzonite of probable Mesozoic age. The mafic gabbro of the region contains 10 to 20 percent plagioclase, major amounts of hornblende and pyroxene, and accessory biotite, magnetite, and apatite (Rose, 1967). Rose's description of the area noted a 50-foot-wide zone of pyritized rocks at the contact between peridotite and monzonite. The occurrence could be at a local peridotite-monzonite contact within the gabbro body. The nearest such contact on the map is, however, about one-half mile north, near MH286. A grab sample collected at locality 20 contained 0.02 ounce of gold per ton, 0.18 ounce of silver per ton, 0.2 percent copper, and a trace of nickel (Rose, 1967). The copper is probably from chalcopyrite or a secondary copper mineral after chalcopyrite.
Age: Mesozoic (?).
Alteration: Pyritization.
Commodities (Major) - Cu; (Minor) - Ag, Au, Ni
Development Status: No
Deposit Model: Uncertain; Porphyry Cu (?) (Cox and Singer, 1986; model 20c) or related to a di
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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.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcopyrite ? | 2.CB.10a | CuFeS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Databases
| Link to USGS - Alaska: | MH287 |
|---|
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