|Quadrangle map, 1:250,000-scale||MH|
|Quadrangle map, 1:63,360-scale||A-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is about 1.5 miles east-southeast of the junction of the Chistochina River and the West Fork Chistochina Rivers. The occurrence is about one-third mile east of the center of section 5, T. 21 S., R. 15 E., Fairbanks Meridian. It corresponds to locality 138 in table 2 of Nokleberg and others (1991), and the location is probably accurate to 0.2 mile.|
This occurrence is in dacite porphyry of Early Permian age. The dacite intrudes the lower part of the Slana Spur Formation of Pennsylvanian to Early Permian age; the Slana Spur Formation is mainly composed of dacite agglomerate. Locally, the dacite porphyry is intensely altered to a rock composed of actinolite, albite, chlorite, epidote, potassium feldspar, and sericite.
This occurrence is a dacite porphyry that contains disseminated pyrite and chalcopyrite and is locally stained with azurite and malachite. A grab sample assayed 1.14 percent copper and 50 parts per million silver (Nokleberg and others, 1991).The deposit is probably a porphyry copper related to the Early Permian dacite porphyry.
|Geologic map unit||(-144.906920955354, 63.1234980856209)|
|Mineral deposit model||Probably Porphyry Cu (Cox and Singer, 1986; model 20c).|
|Mineral deposit model number||20c|
|Age of mineralization||Probably Early Permian.|
|Alteration of deposit||Locally intense alteration of dacite. Alteration minerals include actinolite, albite, chlorite, epidote, potassium feldspar, and sericite.|
|Workings or exploration||Limited surface sampling; no workings reported from the site.|
|Indication of production||None|
Additional commentsMore prospecting appears to be warranted.
Nokleberg, W.J., Lange, I.M., Roback, R.C., Yeend, Warren, and Silva, S.R., 1991, Map showing locations of metalliferous lode and placer mineral occurrences, mineral deposits, prospects, and mines, Mount Hayes quadrangle, eastern Alaska Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1996-C, 42 p., 1 sheet, scale 1:250,000.
|Reporters||W.T. Ellis (Alaska Earth Sciences) and C.C Hawley (Hawley Resource Group)|
|Last report date||7/9/2003|