Unnamed (east of Mt. Recheshnoi)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Other commodities As; Hg; Mo
Ore minerals gold; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale UK
Quadrangle map, 1:63,360-scale A-2
Latitude 53.15
Longitude -168.44
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site is located near the southeast coast of central Umnak Island approximately 4 miles due east of Mt. Recheshnoit an elevation of about 1000 feet. It is in T. 81 S., R. 133 W., of the Seward Meridian The location is accurate to within 1/2 mile.

Geologic setting

Geologic description

This site was reported as the Mt. Recheshnoi prospect by Randolph and Ellis (1989). The rocks consist of altered andesites of Late Tertiary to Quaternity age. The occurrence is a 500 x 2600 foot color anomaly which exhibits propylitic alteration and localized argillization. Quartz occurs both as individual veins and as stockworks. Most of the veins exhibit propylitization and pyritization envelopes up to several feet on either side. In one locality, noted by Randolph and Ellis, several inches of blue-gray pyritic clay envelops comb-structure quartz-filled joints.
Six samples of clay muck and vein material contained up to 72 ppm arsenic, 186 ppb gold, 2.6 ppm mercury, 19 ppm molybdenum, and 4.7 ppm silver (Randolph and Ellis, 1989, p. 11).
Geologic map unit (-168.442003341631, 53.1490570640255)
Mineral deposit model Hot-spring Au-Ag? (Cox and Singer, 1986; model 25a)
Mineral deposit model number 25a?
Age of mineralization Tertiary or younger.
Alteration of deposit The rocks exhibit propylitization with local argillization.

Production and reserves

Workings or exploration Six samples of clay and quartz collected by Battle Mountain Exploration (Randolph and Ellis, 1989) contained up to 72 ppm arsenic, 186 ppb gold, 2.6 ppm mercury, 19 ppm molybdenum, and 4.7 ppm silver.
Indication of production None

Additional comments

This site is located on land selected by the Aleut Native Corporation.

References

MRDS Number 10308468

References

Randolph, D.B., and Ellis, W.T., 1989, Unalaska project, 1989 final report: Battle Mountain Exploration Company, Alaska District, 41 p., 5 appendices, 11 plates, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)
Reporters S.H. Pilcher (Anchorage)
Last report date 1/27/2000