| Quadrangle map, 1:250,000-scale | MH |
|---|---|
| Quadrangle map, 1:63,360-scale | B-5 |
| Latitude | 63.3113 |
| Longitude | -146.0425 |
| Nearby scientific data | Find additional scientific data near this location |
| Location and accuracy | The Specimen Creek placer mine is at an elevation of about 4,000 feet in the upper part of Specimen Creek. The location is approximate but is probably about 1,800 feet west of the center of section 33, T. 18 S., R. 9 E., Fairbanks Meridian. |
Geologic descriptionThe course of upper Specimen Creek is apparently controlled by a steep fault that strikes north-northeast and that separates mafic-ultramafic rocks of the Upper Triassic Eureka ultramafic complex on the east from Pennsylvanian and Permian strata to the west (Rose, 1965, figure 2; Nokleberg and others, 1991). The placer mine is marked by remnants of sluice boxes; it probably was worked on a small scale. The source of the gold is uncertain; Rose (1965) suggested that it may include pyritic rocks (his group A), ultramafic rocks, and high gravels. Rose (1965, locality 14, figure 2) noted copper-stained areas in metavolcanic rocks on the west bank of Specimen Creek. His stream-sediment samples 220 and 223 were anomalous in copper, zinc, and nickel. | |
| Geologic map unit | (-146.044762104982, 63.3108804415912) |
|---|---|
| Mineral deposit model | Placer Au (Cox and Singer, 1986; model 39a). |
| Mineral deposit model number | 39a |
| Age of mineralization | Holocene. |
| Workings or exploration |
Several placer claims and remnants of sluices were found on the upper part of Specimen Creek (Rose, 1965). The occurrence is on active Online Exploration claims. |
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| Indication of production | Undetermined |
References | |
| 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 | 6/19/2001 |