|Quadrangle map, 1:250,000-scale||SR|
|Quadrangle map, 1:63,360-scale||C-7|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The portion of Colorado Creek that has been the most productively placer mined is in the N1/2 sections 5 and 6, T. 6 N., R. 1 W., and the NE1/4 section 1, T. 6 N., R. 2 W., of the Seward Meridian. The map site is on Colorado Creek at an elevation of about 1,400 feet. This is location P-80 of Jansons and others (1984). The location is accurate to within 300 feet.|
Geologic descriptionColorado Creek drains an area underlain chiefly by slate and graywacke of the Valdez Group of Late Cretaceous age (Nelson and others, 1985). The creek occupies a steep, narrow, avalanche-debris-filled valley floored with poorly stratified gravels containing considerable clay. Gold is disseminated throughout the gravels; there are minor concentrations on bedrock. The gold generally is fine, although nuggets as large as three-eighths of an inch in diameter are reported (Jansons and others, 1984). A small mechanized operation mined sporadically on Colorado Creek from 1977 to 1982 with little success. Total production is less than 50 ounces (Jansons and others, 1984).
|Geologic map unit||(-149.506936437705, 60.6435154481193)|
|Mineral deposit model||Placer Au (alluvial) (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary.|
|Workings or exploration||There are signs of some hand mining and the remains of a small mechanical mining operation in the lower part of the creek west of the Seward Highway.|
|Indication of production||Yes; small|
|Production notes||Production is estimated at less than 50 ounces (Jansons and others, 1984).|
Hoekzema, R.P., and Sherman, G.E., 1983, Mineral investigations in the Chugach National Forest, Alaska (Peninsula study area): U.S. Bureau of Mines in-house report; held at U.S. Bureau of Land Management Alaska State Office, Anchorage, 524 p.
Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral occurrences in the Chugach National Forest, southcentral Alaska: U.S. Bureau of Mines Mineral Land Assessment 5-84, 218 p., 2 sheets, scale 1:250,000.
|Reporters||Jeff A. Huber (Anchorage)|
|Last report date||5/21/2000|