|Quadrangle map, 1:250,000-scale||MD|
|Quadrangle map, 1:63,360-scale||C-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Montana placer prospect is located on about 2 miles (3.2 km) of Montana Creek, a tributary of Colorado Creek, from an elevation of 1,400 feet (427 m) to about 1,000 feet (304 m), in Section 21, T. 22 S., R. 15 E., of the Kateel River Meridian. The reporter visited the site in 1996.|
Geologic descriptionThe Montana placer prospect consists of a left limit bench on Montana Creek over a distance of about 2 miles (3.2 km). Overburden ranges from 20 to 40 feet (6 m to 12 m) thick, and auriferous gravels average about 10 feet (3 m) thick. Reconnaissance drilling suggests that most values are on bedrock. The auriferous gravels are overlain by Quaternary eolian and colluvial deposits (Thorson and Guthrie, 1982). The Montana Creek Placer deposit is inferred to be Pleistocene, based on isotopically dated Quaternary units in Colorado Creek (Thorson and Guthrie, 1982).
|Geologic map unit||(-155.982377308627, 63.582389879112)|
|Mineral deposit model||Placer Au-PGE (Cox and Singer, 1986; model 39c).|
|Mineral deposit model number||39c|
|Age of mineralization||The Montana Creek Placer deposit is inferred to be Pleistocene, based on isotopically dated Quaternary units in Colorado Creek (Thorson and Guthrie, 1982).|
|Workings or exploration||The prospect was first mentioned by Mertie (1936). According to Steve Neirod and Ron Rosander (oral communication, 1982), a reconnaissance churn drilling program in the 1950s conducted by Strandberg and Sons Mines Inc. encountered a low grade gold-bearing paystreak of unknown extent.|
|Indication of production||Undetermined|
|Production notes||No production records have been found. In 1996 and 1997, a small exploration camp was being assembled at Colorado Creek for a placer drilling program on Montana Creek.|
Additional commentsSee Colorado Creek (MD014).
Bundtzen, T.K., Pinney, D.S., and Laird, G.M., 1997, Preliminary geologic map and descriptive data tables from the Ophir C-1 and western Medfra C-6 quadrangles, Alaska: Alaska Division of Geological and Geophysical Surveys Public Data File Report 97-46, 10 p., 1 sheet, scale 1:63,360.
Mertie, J.B., Jr., 1936, Mineral deposits of the Ruby-Kuskokwim region, Alaska: U.S. Geological Survey Bulletin 864-C, p. 115-245.
Patton, W.W. Jr., Moll, E.J., Dutro, J.T., Jr., Silberman, M.L., and Chapman, R.M., 1980, Preliminary geologic map of the Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811-A, one sheet at 1:250,000 scale.
Thorson, R. M., and Guthrie, R.D., 1982, Stratigraphy of the Colorado Creek Mammoth locality, Alaska: Quaternary Research, vol. 37, no. 2, p. 214-278.
|Reporters||Bundtzen, T.K. (Pacific Rim Geological Consulting)|
|Last report date||6/3/1998|