| Quadrangle map, 1:250,000-scale | UN |
|---|---|
| Quadrangle map, 1:63,360-scale | A-6 |
| Latitude | 53.33 |
| Longitude | -167.73 |
| Nearby scientific data | Find additional scientific data near this location |
| Location and accuracy | Northeast side of Umnak Pass between Boulder Bay and Paso Point on Unalaska Island. Anomaly no. 46 of Christie (1974). |
Geologic descriptionA small 1,500 ft (450 m) long north-south trending color anomaly is developed in hornfelsed sedimentary, and pyroclastic volcanic rocks of the Unalaska Formation (see Drewes and others, 1961) cut by north-south trending monzonite and feldspar porphyry dikes. Disseminated and fracture-controlled pyrite occurs in both dike and wall rocks. Minor quartz veining is noted in the description of the occurrence as is weak fracturing. | |
| Geologic map unit | (-167.73192039236, 53.3291033379538) |
|---|---|
| Mineral deposit model | Epithermal gold vein |
| Mineral deposit model number | 25 |
| Age of mineralization | Miocene or younger. |
| Alteration of deposit | Propylitic alteration as evidenced by the presence of chlorite and epidote. |
| Workings or exploration | Brief reconnaissance mapping and 4 soil or silt samples. Copper, molybdenum, zinc and silver were low, however a few samples showed gold to 0.20 ppm. |
|---|---|
| Indication of production | None |
| MRDS Number | A106026 |
|---|---|
ReferencesChristie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps. (Report held by the Aleut Corporation, Anchorage, Alaska.)
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| Reporters | Damon Bickerstaff, F.H. Wilson |
| Last report date | 5/6/1994 |