Morzhovoi Bay

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Cu
Ore minerals chalcopyrite; pyrite
Gangue minerals tourmaline

Geographic location

Quadrangle map, 1:250,000-scale FP
Quadrangle map, 1:63,360-scale D-4
Latitude 54.9433
Longitude -163.075
Nearby scientific data Find additional scientific data near this location
Location and accuracy Approximate location is near south end of unnamed lake west of Kenmore Head at the mouth of Morzhovoi Bay. Anomaly no. 44 of Christie (1974) and no. 7 of MacKevett and Holloway (1977, p. 11).

Geologic setting

Geologic description

Christie (1974) briefly examined a weak color anomaly 1.5 by 3 mi (2.4 by 5 km) in size, trending roughly east-west (110ΓΈ). He reports finding a variety of rock types, including diorite, feldspar porphyry(?), monzonite, epiclastic rocks, and volcanic flows. His geologic description is scant, but he suggested further work if geochemistry indicated copper mineralization. It didn't, but there still is an unevaluated central covered area, including part of a lake, that is at least 1.5 mi (4 km) square. Fracturing is reported to be strong only locally on the west end of the anomaly. MacKevett and Holloway (1977) reported an altered zone associated with a breccia zone containing tourmaline, developed in a young volcanic terrane.
Geologic map unit (-163.077004330032, 54.9424170717456)
Mineral deposit model Copper porphyry, epithermal gold vein
Mineral deposit model number 17, 25
Age of mineralization Miocene or younger
Alteration of deposit Christie (1974) reports minor epidote in southeast corner of occurrence, as well as chlorite, clay, and possibly sericite. This mineral assemblage suggests propylitic, argillic, and possibly sericitic alteration. Leaching is partial to locally complete in the anomaly.

Production and reserves

Workings or exploration Brief reconnaissance geologic mapping and geochemical sampling reported by Christie (1974). Geochemical results showed copper typically less than 50 ppm and molybdenum less than 5 ppm, whereas silver ranged from 1.2 to 2.1 ppm and gold was as high as 0.03 ppm.
Indication of production None

Additional comments

MacKevett and Holloway's (1977) report was based on an unreferenced industry source originally thought to be Christie (1974); however Christie (1974) does not mention breccia or tourmaline at this occurrence.

References

MRDS Number A106108

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 G.D. DuBois, F.H. Wilson
Last report date 5/6/1994