Presque Isle

Sediment-hosted stratabound copper (Reduced-facies) deposit in Michigan, United States

Names and other identifiers

GMRAP ID 10665
Alternate names Cottonwood
Tract name LS07 - Lake Superior (003rfCu3003)
Site status deposit

Geographic location

Country United States
State or province Michigan
Geographic location -89.9833, 46.6833
Geologic map unit -89.9833, 46.6833
Nearby data

Geologic information

Deposit type Sediment-hosted stratabound copper
Deposit subtype Reduced-facies
Age (Ma) 1500Ma

Commodity and development information

Major commodities Cu
Tonnage (Mt) 91Mt
Cu grade (%) 1.3%
Ag grade (g/t) 5g/t
Contained copper 1,200,000t

Reference information

References Kirkham and others (1994); Marston and Marston, Inc. (2011); Cox and others (2003)
Site reference Ludington and Cox (1996)
Kirkham, R.V., Carriere, J.J., Laramee, R.M., and Garson, D.F., 1994, Global distribution of sediment-hosted stratiform copper deposits and occurrences: Geological Survey of Canada Open File 2915b, 256 p.
Marston and Marston, Inc., 2011, Resource estimate and NI43-101 technical report for Copperwood Project, Ironwood Michigan: Marston and Marston, Inc. Technical Report, prepared for Orvana Resources US Corp., March 7, 2011, 135 p., accessed July 27, 2011, at [Web page no longer available.]
Cox, D.P., Lindsey, D.A., Singer, D.A., Moring, B.C., and Diggles, M.F., 2003 [2007], Sediment-hosted copper deposits of the world—Deposit models and database: U.S. Geological Survey Open-File Report 03–107, v. 1.3, 53 p. (Also available at