|Quadrangle map, 1:250,000-scale||CV|
|Quadrangle map, 1:63,360-scale||C-7|
|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.
Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Cordova quadragle, Alaska: U.S. Geological Survey Open-file Report OF 79-973, 73 p.
|Reporters||S.W. Nelson, Anchorage, AK|
|Last report date||6/10/2000|