| Main commodities | Ag; Au |
|---|---|
| Gangue minerals | pyrite; pyrrhotite |
| Quadrangle map, 1:250,000-scale | UN |
|---|---|
| Quadrangle map, 1:63,360-scale | C-3 |
| Latitude | 53.8667 |
| Longitude | -166.8 |
| Nearby scientific data | Find additional scientific data near this location |
| Location and accuracy | Headwaters of south fork of Makushin River. Anomaly no. 19 of Christie (1974). |
Geologic descriptionA pale yellow-brown to dark red-brown color anomaly 3,000 ft (900 m) in diameter located in volcanic flows and pyroclastic rocks of the Unalaska Formation (see Drewes and others, 1961) is reported by Christie (1974). These volcanic rocks are intruded by numerous small dikes and plugs of diorite containing sparse disseminated pyrite. Post-mineralization andesite and gabbro dikes are present. 'Fracture sulfides were important in several areas that are now totally leached. No evidence for copper mineralization was seen there or elsewhere in the system (Christie, 1974).' | |
| Geologic map unit | (-166.80188419054, 53.8658435784481) |
|---|---|
| Mineral deposit model | Epithermal gold veins (Cox and Singer, 1986; model 25c?). |
| Mineral deposit model number | 25? |
| Age of mineralization | Cenozoic |
| Alteration of deposit | Argillic alteration is characteristic with there being local development of silicification and sericitic alteration. Leaching (of sulfides?) is complete in fractures and only partial where they are disseminated (Christie, 1974). |
| Workings or exploration | Limited reconnaissance mapping and 8 soil(?) samples. Samples contained up to 2.4 ppm silver, one contained 0.44 ppm gold. |
|---|---|
| Indication of production | None |
| MRDS Number | A106011 |
|---|---|
ReferencesChristie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps.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 | 5/3/1994 |