DeCourcy Mountain

The DeCourcy Mountain is a mercury 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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Site Name

Primary: DeCourcy Mountain
Secondary: Decourcy Mt. Mine

Commodity

Primary: Mercury
Secondary: Antimony

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: Disseminated epithermal mercury antomony

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Igneous and sedimentary rocks are extensively altered to silica-carbonate rock.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Stibnite
Ore: Cinnabar

Comments

Comment (Exploration): Status = Inactive

Comment (Geology): Geologic Description = Cinnabar and minor stibnite in a gangue of silica, carbonate, and clay minerals. Ore minerals occur in small irregular lenses, veins, and stockworks localized in breccia, along contacts between igneous and sedimentary rocks, and along bedding surfaces. The ore bodies are in or near hydrothermally altered diabase sills. Ore bodies pinch and swell from a few inches to over a foot, and were formed by both open space filling and replacement.

Comment (Workings): Workings / Exploration = Surface and underground: About 1,375 ft. of adits and minor drifts, crosscuts, and stopes; surface pits and trenches.

Comment (Reference): Primary Reference = Sainsbury and MacKevett, 1965

Comment (Production): Production Notes = Discovered in 1910-11; staked in 1919; operated intermittently 1920-50. Produced an estimated 1500 flasks of Hg

Comment (Commodity): Gangue = clay minerals

Comment (Commodity): Gangue = Silica-carbonate

Comment (Deposit): Model Name = Epithermal vein,?: mercury-antimony

Comment (Reserve-Resource): Reserves = Inferred reserves of several thousand flasks.

Comment (Geology): Age = Tertiary

References

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): 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): Cady, W.M., Wallace, R.E., Hoare, J.M., and Webber, E.J., 1955, The central Kuskokwim region, Alaska: U.S. Geological Survey Professional Paper 268, 132 p.

Reference (Deposit): Sainsbury, C.L. and MacKevett, E.M., Jr., 1965, Quicksilver deposits of southwestern Alaska: U.S. Geological Survey Bulletin 1187, 89 p.

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.

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