| Quadrangle map, 1:250,000-scale | AD |
|---|---|
| Quadrangle map, 1:63,360-scale | C-2 |
| Latitude | 51.8669 |
| Longitude | -176.6269 |
| Nearby scientific data | Find additional scientific data near this location |
| Location and accuracy | Topographic knob at east end of dock area at Adak Naval Air Station. |
Geologic descriptionSilicified volcanic breccia cut by 60-m-wide andesite(?) dike. Coats (1956) mapped knob as a plug, however the bulk of the outcrop along the road is breccia. Interstitial spaces between breccia fragments are locally zeolite(?) filled. Dike has a well developed chilled margin. | |
| Geologic map unit | (-176.629372647994, 51.8655224869113) |
|---|---|
| Age of mineralization | Tertiary. |
| Alteration of deposit | Silicification and chloritization of volcanic breccia. |
| Workings or exploration | A number of samples (93AWs 2a-d) were collected during brief U.S. Geological Survey reconnaissance studies in 1993; all were copper-bearing in the 110-160 ppm Cu range. A few samples of andesite and andesitic volcanic breccia yielded low-level gold in the 2-6 ppb range. Float samples were found of iron-stained andesite(?) that contained 3-5 percent unidentified sulfide minerals. |
|---|---|
| Indication of production | None |
| MRDS Number | A106038 |
|---|---|
| Reporters | F.H. Wilson, T.D. Light |
| Last report date | 2/22/1996 |