| Quadrangle map, 1:250,000-scale | MH |
|---|---|
| Quadrangle map, 1:63,360-scale | B-4 |
| Latitude | 63.3229 |
| Longitude | -145.6512 |
| Nearby scientific data | Find additional scientific data near this location |
| Location and accuracy | This occurrence is at an elevation of 4,750 feet on Rainbow Ridge and about 1.1 miles north-northwest of the top of Rainbow Mountain. It is in the SE1/4SW1/4 section 28, T. 18 S., R. 11 E., Fairbanks Meridian. |
Geologic descriptionAt this location semimassive to massive pyrite, chalcopyrite, galena, and sphalerite occur in rubble and a veinlike outcrop zone that is 6 feet across (D. Johnson, oral communication, 2001). The zone is in Permian (?) dacite porphyry that cuts the Slana Spur Formation of Pennsylvanian age (Nokleberg and others, 1991). The dacite is intensely silicified, and chlorite is developed at the margin of the veinlike zone. This occurrence was discovered by Northeast Exploration during the summer of 2001, and only hand trenching has been completed to date (2002). Selected samples assay as much as 22.5 percent zinc, 8.02 percent lead, 1.3 ounces of silver per ton, and 0.4 ounce of gold per ton (D. Johnson, oral communication, 2001). | |
| Geologic map unit | (-145.65345158741, 63.3224882854348) |
|---|---|
| Mineral deposit model | Polymetallic vein(s) (Cox and Singer, 1986; model 22c). |
| Mineral deposit model number | 22c |
| Age of mineralization | Permian (?) or younger. |
| Alteration of deposit | The dacite porphyry is intensely silicified, and chlorite is developed on the margin of the veinlike zone. |
| Workings or exploration |
This occurrence was discovered by Northeast Exploration during the summer of 2001, and only hand trenching has been completed to date (2002). Selected samples assay as much as 22.5 percent zinc, 8.02 percent lead, 1.3 ounces of silver per ton, and 0.4 ounce of gold per ton (D. Johnson, oral communication, 2001). The occurrence is on active claims of Northeast Exploration. |
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| Indication of production | None |
| Reporters | W.T. Ellis (Alaska Earth Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS) |
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| Last report date | 6/21/2002 |