| Quadrangle map, 1:250,000-scale | AT |
|---|---|
| Quadrangle map, 1:63,360-scale | C-2 |
| Latitude | 52.82 |
| Longitude | 173.42 |
| Nearby scientific data | Find additional scientific data near this location |
| Location and accuracy | This site is located west of Chirikof Point on Attu Island. Its specific location is not known. The map site is probably accurate to within 3 miles. |
Geologic descriptionOn Attu Island partly oxidized zones of pyrite occur in many rock types, including basalt and andesite flows and pyroclastics (Gates and others, 1971). The zones range in size from small isolated pods a few feet in diameter to broad areas 2 to 3 miles long and one mile wide. Many elongate zones or small, isolated patches trend or are aligned east-west. At Chirikof Point pyritic mineralization is associated with flows and hornblende-bearing dikes and shows evidence of silicification and albitization with accompanying epidote and chlorite. The mineralized zones carry traces of copper and lead. | |
| Geologic map unit | (-173.422418889067, 52.8187787174834) |
|---|---|
| Age of mineralization | Tertiary or younger. |
| Alteration of deposit | The altered rocks contain silica, albite, epidote, chlorite, and iron-oxides. |
| Indication of production | None |
|---|---|
Additional commentsSite is located within Aleutian Maritime Wildlife Refuge. | |
| MRDS Number | 10307227 |
|---|---|
| Reporters | S.H. Pilcher (Anchorage) |
| Last report date | 1/22/2000 |