| Quadrangle map, 1:250,000-scale | NM |
|---|---|
| Quadrangle map, 1:63,360-scale | C-1 |
| Latitude | 64.6441 |
| Longitude | -165.4953 |
| Nearby scientific data | Find additional scientific data near this location |
| Location and accuracy | This prospect is at an elevation of about 175 feet on lower Boulder Creek, a west tributary to Snake River. The prospect is near the edge of the Snake River flood plain and about 6,000 feet upstream from the mouth of Boulder Creek. The map location is at the southwest corner of section 4, T. 10 S., R. 34 W., Kateel River Meridian. It is included in locality 94 of Cobb (1972 [MF 463], 1978 [OFR 78-93]). |
Geologic descriptionAuriferous quartz veins near the mouth of Boulder Creek were reported to contain 0.15 to 0.20 ounce of gold per ton (Collier and others, 1908, p. 196). Mertie (1918) reported a gold-bearing quartz vein in the bed of Boulder Creek on placer claim No. 1 Below Discovery; it was in a fault zone from which free gold could be panned. Examination of this area in 1991 located a lode prospect on the north side of Boulder Creek about 800 feet upstream from the downstream limit of patented mining claims. At this point, a short adit had been driven northeast on a limonite-stained quartz vein (Kennecott Exploration Company, written communication, 1992). The limonite probably replaced pyrite. No free gold was observed, but a sample of the vein contained about 0.1 ounce of gold per ton. | |
| Geologic map unit | (-165.497907215813, 64.6433327177832) |
|---|---|
| Mineral deposit model | Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a). |
| Mineral deposit model number | 36a |
| Age of mineralization | Mid-Cretaceous or younger; postdates regional metamorphism of the host rocks. |
| Workings or exploration | A short adit, now caved, was driven northeast on an iron-stained quartz vein. This may be the same prospect as that reported by Collier and others (1908). |
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| Indication of production | Undetermined |