Beaver Inlet, Erskine Bay, Kisselem Bay

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Cu
Other commodities Zn
Ore minerals pyrite
Gangue minerals chlorite

Geographic location

Quadrangle map, 1:250,000-scale UN
Quadrangle map, 1:63,360-scale B-2
Latitude 53.725
Longitude -166.58333
Nearby scientific data Find additional scientific data near this location
Location and accuracy Point of land separating Erskine Bay and Kisselem Bay, Beaver Inlet. Anomaly no. 11 of Christie (1974).

Geologic setting

Geologic description

Orange, brown, and purple color anomaly, 300 ft (90 m) by 1500 ft (450 m) confined to feldspar porphyry andesite. Anomaly is oriented along ridge crest, essentially east-west. Color is due to weathering of very finely disseminated pyrite. Narrow N-S trending shear zones are especially leached and fractured; their original sulfide content was indeterminate due to the extensive leaching and alteration in the shear zones. Some zones, especially one at extreme east end of point of land, may represent zones of bleaching and alteration due to solfataric activity. Fracturing ranges from poor to intense. Other associated rocks include amygdaloidal andesite and minor coarse-grained diorite. No visible sulfides were seen in the dioritic intrusive.
Geologic map unit (-166.585212453715, 53.724147953434)
Mineral deposit model Copper porphyry, epithermal gold vein
Mineral deposit model number 17, 25
Age of mineralization Cenozoic
Alteration of deposit Chlorite is the only alteration phase mentioned and may indicate propylitic alteration. However, bleaching (leaching) may indicate other types of alteration. Alteration ranges from moderate to very intense.

Production and reserves

Workings or exploration Eighteen soil samples were collected in the course of reconnaissance mapping, samples contained up to 123 ppm copper, 102 ppm zinc, 1.7 ppm silver, and 0.02 ppm gold.
Indication of production None

References

MRDS Number A106018

References

Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps. (Report held by the Aleut Corporation, Anchorage, Alaska.)
Reporters Damon Bickerstaff, F.H. Wilson
Last report date 5/3/1994