Steeple Point

Occurrence, Inactive

Commodities and mineralogy

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

Geographic location

Quadrangle map, 1:250,000-scale UK
Quadrangle map, 1:63,360-scale B-1
Latitude 53.27
Longitude -168.32
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site is at an elevation of about 1000 feet approximately 1 mile east-southeast of Steeple Point. Site location is accurate to within 1 mile. Ellis and Randolph (1989) named this the Steeple Point prospect.

Geologic setting

Geologic description

This geothermal site is described by Randolph and Ellis (1989) as being similar to ARDF number UK005. The rocks consist of waterlain tuffs and lahars of Quaternary age. The site contains numerous fumaroles and hot-springs and is marked by a 7,000 by 4,000 foot color anomaly. It consists of acid-leached rocks and localized silica stockworks. Some of the fumarolic centers display strong silicification and pyritization. Hot-spring centers also exhibit silicification and chalcedonic breccias. Combined metal values from 55 rock samples obtained here and at ARDF number UK005 are up to >2000 ppm arsenic, 115 ppb gold, >5 ppp mercury, 11 ppm molybdenum, and 4.4 ppm silver (Randolph and Ellis, 1989).
Geologic map unit (-168.321981621342, 53.2690828757399)
Mineral deposit model Hot-springs Au-Ag (Cox and Singer, 1986, model 25a)
Mineral deposit model number 25a
Age of mineralization Quaternary.
Alteration of deposit The rocks at this site exhibit silicification, argillization, acid leaching, and pyritization.

Production and reserves

Workings or exploration Battle Mountain Exploration examined and sampled this site in 1989 (Randolph and Ellis, 1989).
Indication of production None

Additional comments

This site is on land conveyed, patented, or selected by the Aleut Native Corporation.

References

MRDS Number 10308473

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