Flat Creek and Marietta Basin

The Flat Creek and Marietta Basin is a gold mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Flat Creek and Marietta Basin
Secondary: Marietta
Secondary: Flat Creek

Commodity

Primary: Gold
Secondary: Antimony
Secondary: Tungsten
Secondary: Mercury

Location

State: Alaska
District: Iditarod

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Placer Au-PGE

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Cinnabar
Ore: Gold
Ore: Scheelite
Ore: Stibnite

Comments

Comment (Deposit): Other Comments = Lower 4 mi. of valley has gradient of about 100 ft./mile; Uppermost mile of valley drops approximately 1000 ft.

Comment (Deposit): Model Name = placer: residual, eluvial, stream, bench

Comment (Exploration): Status = Inactive

Comment (Reference): Primary Reference = Bundtzen and others, 1992

Comment (Geology): Geologic Description = Deeply weathered monzonite stock at head of Flat Creek constitutes a residual placer, which grades downstream into alluvial placers and then into bench and stream placers. Best pay is 3-4 mi. above mouth. Gold from benches is coarser and higher grade than gold from creek gravel. Mertie (1936) reported average fineness of 878 parts Au and 114 parts Ag.

Comment (Commodity): Gangue = Concentrates contain arsenopyrite.

Comment (Workings): Workings / Exploration = Surface; extensive dredging; actively mined during 1994.

Comment (Geology): Age = Tertiary/Quaternary

Comment (Production): Production Notes = Mined by dredge 1915-56; further mining 1970-86. Recorded production is 477,039 oz. Au; considered minimum estimate.

References

Reference (Deposit): Smith, P.S., 1917, The Lake Clark-Central Kuskokwim region, Alaska: U.S. Geological Survey Bulletin 655, 162 p., 2 sheets, scale 1:250,000.

Reference (Deposit): Bundtzen, T.K., Miller, M.L., Laird, G.M., and Bull, K.F., 1992, Geology and mineral resources of Iditarod mining district, Iditarod B-4 and eastern B-5 quadrangles, southwestern Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 97, 46 p., 2 sheets, scale 1:63,360.

Reference (Deposit): Miller, M.L., Bundtzen, T.K., Keith, W.J., Bailey, E.A., Bickerstaff, Damon, 1996, Geology and mineral resources of the Stuyahok area, part of Holy Cross A-4 and A-5 quadrangles, Alaska: U.S. Geological Survey Open-File Report 96-505-A, 30 p.

Reference (Deposit): Swainbank, R.C., Bundtzen, T.K., Clough, A.H., Henning, M.W., and Hansen E.W., 1995, Alaska's mineral industry 1994: Alaska Division of Geological and Geophysical Surveys Special Report 49, 77 p.

Reference (Deposit): Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction material) in the Iditarod and Ophir quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-576, 101 p.

Reference (Deposit): Mertie, J.B., Jr., and Harrington, G.L., 1916, Mineral resources of the Ruby-Kuskokwim region, in Brooks, A.H., and others, Mineral Resources of Alaska, Report on Progress of Investigations in 1915: U.S. Geological Survey Bulletin 642, p. 223-266.

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Iditarod quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-363, 1 sheet, scale 1:250,000.

Reference (Deposit): Mertie, J.B., Jr., 1936, Mineral deposits of the Ruby-Kuskokwim region, Alaska: U.S. Geological Survey Bulletin 864-C, 115-245.

Reference (Deposit): Smith, P.S., 1917, The Lake Clark-central Kuskokwim region, Alaska: U.S. Geological Survey Bulletin 655, 192 p.

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