Unnamed (on Davidof and Lopy Islands)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Fe
Other commodities Cu; Pb; Zn
Ore minerals iron-oxides

Geographic location

Quadrangle map, 1:250,000-scale RI
Quadrangle map, 1:63,360-scale C-5
Latitude 51.968
Longitude 178.368
Nearby scientific data Find additional scientific data near this location
Location and accuracy
This site represents northern tip of Davidof Island and the southern 1/2
of Lopy Island (located about 1000 feet north of Davidson Island). Site location is accurate to within 1000 feet.

Geologic setting

Geologic description

Davidof and Lopy Island consist entirely of Late Tertiary to Quaternary andesitic lava flows and pyroclastic rocks (Nelson, 1959). A large percentage of the rocks on the northern tip of Davidof Island and on the southern 1/2 of Lopy Island have been intensely altered to various shades of yellow, orange, and brown. Some of these altered zones may contain traces of copper, lead, and zinc. The most intensely altered rock consists entirely of iron oxide, chlorite, magnetite, and quartz.
Geologic map unit (-178.370593608434, 51.966559844463)
Age of mineralization Late Tertiary or Quaternary.
Alteration of deposit The original flow rocks have been intensely altered to iron oxides, chlorite, magnetite, and quartz. The iron oxides may have resulted from the weathering of pyrite.

Production and reserves

Indication of production None

Additional comments

Site is located within the Alaska Maritime Natural Wildlife Refuge.

References