| Quadrangle map, 1:250,000-scale | CV |
|---|---|
| Quadrangle map, 1:63,360-scale | C-7 |
| Latitude | 60.68 |
| Longitude | -146.46 |
| Nearby scientific data | Find additional scientific data near this location |
| Location and accuracy | This beach placer site represents about two miles of the shore of outer Port Gravina between Red Head and Hell's Hole. The map site is about at the mid-point of the beach placer. It is in the E1/2 sec. 4, T. 13 S., R. 8 W., of the Copper River Meridian. The site is accurately located to within 2000 ft. This location as site P-18 in Jansons and others (1984). |
Geologic descriptionThis prospect consists of heavy minerals, including gold, in wave-formed beach placer deposits. Zones of heavy-mineral concentration in the sand can reach three feet thick. One such one-foot-thick zone overlying pebbles of felsic intrusive rock, greenstone, graywacke and slate was sampled and contained over 10% garnet (Jansons and others, 1984). Two 0.1 cubic-yard samples of the beach sand contained <0.03 ppm to 0.0002 oz. Au/ton. | |
| Geologic map unit | (-146.461995112523, 60.6794473716128) |
|---|---|
| Mineral deposit model | Beach placer (Cox and Singer, 1986; model 39a) |
| Mineral deposit model number | 39a |
| Age of mineralization | Holocene. |
| Workings or exploration | Surface workings. Heavy-mineral concentration zones contained over 10% garnet. Two 0.1 cubic-yard samples of the beach sand contained <0.03 ppm to 0.0002 oz. Au/ton (Jansons and others, 1984). |
|---|---|
| Indication of production | Yes; small |
| Production notes | Not more than 500 oz. Au produced (Cobb, 1979 [OF 79-973]). |
Additional commentsSite is in the Chugach National Forest. | |
| MRDS Number | A010436 |
|---|---|
References | |
| Reporters | S.W. Nelson, Anchorage, AK |
| Last report date | 6/10/2000 |