Unnamed

Occurrence, Inactive

Commodities and mineralogy

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

Geographic location

Quadrangle map, 1:250,000-scale FP
Quadrangle map, 1:63,360-scale D-3
Latitude 54.96667
Longitude -162.8167
Nearby scientific data Find additional scientific data near this location
Location and accuracy Approximate location is south of Walrus Peak. Anomaly no. 54 of Christie (1974) and no. 8 of MacKevett and Holloway (1977, p.11). See also CB001 in Cold Bay quadrangle (Wilson, 1997).

Geologic setting

Geologic description

Christie (1974) briefly examined an east-west oriented 1 by 4 mi (1.6 by 6.4 km) color anomaly. The anomaly occurs in andesitic volcanic rocks, that include flows, pyroclastic rocks and breccia intruded in the center of the anomaly by a medium-grained dioritic pluton, on the east by a feldspar porphyry and on the west by minor diorite dikes. At east end of the color anomaly, a large covered area 1 mi (1.6 km) wide of indeterminate length may expand the occurrence. Volcanic rocks contain disseminated and fracture-controlled pyrite; mineralization does not increase at contact with the diorite. Both the diorite and volcanic rocks are cross-cut by thin breccia zones composed of severely leached and bleached angular wall rocks in a matrix of iron oxide. At western end of the anomaly, pyrite concentrations are highest in pyroclastic rock and breccia units.
Geologic map unit (-162.818703607936, 54.965789613173)
Mineral deposit model Epithermal gold vein
Mineral deposit model number 25
Age of mineralization Miocene or younger
Alteration of deposit Propylitic alteration is present to a moderate extent in the diorite and may be more common in the volcanic rocks. Hydrothermal minerals include chlorite, epidote, clay, and locally magnetite.

Production and reserves

Workings or exploration Christie (1974) reports brief reconnaissance geologic mapping and the collection of more than 30 soil and silt samples. Copper content typically was less than 50 ppm, although one sample yielded 101 ppm. Zinc ranged as high as 490 ppm, silver to 4.1 ppm and gold to 0.03 ppm.
Indication of production None

Additional comments

No quartz veins are mentioned by Christie (1974), but this does not indicate that they are absent, inasmuch as his focus was mainly on porphyry mineralization.

References

MRDS Number A106104

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