Occurrence, Inactive
Quadrangle map, 1:250,000-scale | MH |
---|---|
Quadrangle map, 1:63,360-scale | A-2 |
Latitude | 63.2086 |
Longitude | -144.9181 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | This occurrence is about 2 miles east of the terminus of the Chistochina Glacier at an elevation of about 5,000 feet. It is in the NE1/4SW1/4 section 5, T. 20 S., R. 15 E., Fairbanks Meridian. It corresponds to locality 14 on figure 1 of Rose (1967), locality 5 on figure 6 of Cobb (1979 [OFR 78-238]), and locality 130 in table 2 of Nokleberg and others (1991). The location is probably accurate within 0.2 mile. |
Geologic descriptionArgillite of the Slana Spur Formation is pyritized adjacent to a granodiorite intrusion of probable Mesozoic age (Rose, 1967). The pyritic zone is about 750 by 1,500 feet in extent. A sample of intensely iron stained argillite with a trace of chalcopyrite contained 0.04 ounce of gold per ton and a trace of silver (Rose, 1967). A sample collected during a U.S. Geological Survey investigation contained 1.2 ppm of gold, a trace of silver, and 100 ppm tungsten (Nokleberg and others, 1991). | |
Geologic map unit | (-144.920328038478, 63.2082030102946) |
---|---|
Mineral deposit model | Polymetallic vein(s) (Cox and Singer, 1986; model 22c). |
Mineral deposit model number | 22c |
Age of mineralization | Probably related to a nearby Mesozoic intrusion. |
Alteration of deposit | Pyritization of argillite adjacent to a Mesozoic granodiorite. |
Workings or exploration | Geologic mapping and limited surface sampling. |
---|---|
Indication of production | None |
References | |
Reporters | W.T. Ellis (Alaska Earth Sciences), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS) |
---|---|
Last report date | 6/28/2003 |