| Main commodities | Cu |
|---|---|
| Ore minerals | chalcopyrite; malachite; pyrite |
| Gangue minerals | quartz |
| Quadrangle map, 1:250,000-scale | HE |
|---|---|
| Quadrangle map, 1:63,360-scale | A-1 |
| Latitude | 63.07 |
| Longitude | -147.27 |
| Nearby scientific data | Find additional scientific data near this location |
| Location and accuracy | This occurrence is at an elevation of about 3,900 feet, on of the first northwest tributary to Raft Creek. The map site is about 1.2 mile north of the Denali Highway, near the center of sec. 25, T. 21 S., R. 2 E., of the Fairbanks Meridian. This location is shown in Smith (1981). |
Geologic descriptionThe country rocks in the area of the occurrence are mostly the Nikolai Greenstone, a thick sequence of Middle or upper Triassic basalt and subordinate tuff, argillite, and chert (Nokleberg and others, 1992). At the occurrence, a small diorite pluton intrudes the Nikolai Greenstone. The deposit consists of chalcopyrite, pyrite, and malachite erratically distributed in quartz veins 1/4 to 3 inches wide. The veins occur along a shear zone several feet wide that cuts the diorite pluton. | |
| Geologic map unit | (-147.272253293554, 63.0695520016713) |
|---|---|
| Mineral deposit model | Quartz vein in shear zone. |
| Age of mineralization | Middle Triassic or younger. |
| Alteration of deposit | Local oxidation and copper minerals. |
| Indication of production | None |
|---|
| MRDS Number | A011362 |
|---|---|
References | |
| Reporters | D.L. Stevens (Stevens Exploration Management Corporation) |
| Last report date | 4/7/2000 |