|Quadrangle map, 1:250,000-scale||RI|
|Quadrangle map, 1:63,360-scale||C-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||
This site represents northern tip of Davidof Island and the southern 1/2of Lopy Island (located about 1000 feet north of Davidson Island). Site location is accurate to within 1000 feet.
Geologic descriptionDavidof 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.|
|Indication of production||None|
Additional commentsSite is located within the Alaska Maritime Natural Wildlife Refuge.
|Reporters||S.H. Pilcher (Anchorage)|
|Last report date||1/24/2000|