| Main commodities | Cu |
|---|---|
| Ore minerals | chalcopyrite; pyrite |
| Gangue minerals | epidote; zeolite |
| Quadrangle map, 1:250,000-scale | MH |
|---|---|
| Quadrangle map, 1:63,360-scale | A-5 |
| Latitude | 63.2309 |
| Longitude | -146.1725 |
| Nearby scientific data | Find additional scientific data near this location |
| Location and accuracy | The Tv Bas occurrence is at an elevation of about 4,400 feet 3.3 miles north of the east tip of Sevenmile Lake. It is just inside the northwest corner of section 35, T. 19 S., R. 8 E., Fairbanks Meridian. The location is accurate within 0.2 mile. |
Geologic descriptionThe TV Bas occurrence is in outcrop and rubble crop of Tertiary gray to red-brown, locally vesicular olivine basalt that unconformably overlies mafic-ultramafic rocks of the Fish Lake complex of Late Triassic age (Nokleberg and others, 1991). The basalt is porphyritic; light green olivine phenocrysts occur in a fine-grained matrix. Vesicles contain epidote, zeolite (?), pyrite, and chalcopyrite fillings (W.T. Ellis, oral communication, 2001). Grab samples of vesicular basalt contain as much as 254 parts per million copper. | |
| Geologic map unit | (-146.174756449751, 63.2304755415126) |
|---|---|
| Mineral deposit model | Unclassified. |
| Age of mineralization | Tertiary. |
| Alteration of deposit | Epidote and zeolite (?) filling in vesicles. |
| Workings or exploration | The occurrence is on active Fort Knox Gold Resource claims. |
|---|---|
| Indication of production | None |
References | |
| Reporters | W.T. Ellis (Alaska Earth Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS) |
|---|---|
| Last report date | 6/18/2001 |