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“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Calumet in Houghton County, Michigan — The American Midwest (Great Lakes)
 

Float Copper

 
 
Float Copper Marker image. Click for full size.
By Mike Wintermantel, August 13, 2014
1. Float Copper Marker
Inscription. a mass of native copper weighing 9,392 lbs. found in 1970, buried under three ft. of soil, (glacial till), about 4½ miles southwest of Calumet. Float copper such as this, was torn loose from fissures and lodes by glacial action and together with other rock materials, carried by the ice sheet for great distances before being deposited as glacial debris, or till. The churning, grinding action at the base of the glacier rounded and smoothed the mass of copper, resulting in the lobate form here. The long period of burial, (about 9,000 years), since the cessation of glacial action, accounts for the thorough oxidation of the surface of the copper. The resulting oxidation products are primarily malachite, (green copper carbonate, CuCo3•Cu (OH)2) and cuprite, (red copper oxide,-Cu2O).
Similar pieces such as this, were often discoverd in Keweenaw and on Isle Royale.
 
Location. 47° 14.507′ N, 88° 26.889′ W. Marker is in Calumet, Michigan, in Houghton County. Marker is at the intersection of Calumet Avenue (U.S. 41) and Red Jacket Drive on Calumet Avenue. Touch for map. Marker is in this post office area: Calumet MI 49913, United States of America.
 
Other nearby markers. At least 8 other markers are within 11 miles of this marker, measured as the crow flies. Clearing the Way
Float Copper Marker image. Click for full size.
By Mike Wintermantel, August 13, 2014
2. Float Copper Marker
(about 700 feet away, measured in a direct line); Calumet Theater (approx. half a mile away); St. Paul the Apostle Church (approx. half a mile away); The Italian Hall / Italian Hall Tragedy (approx. 0.6 miles away); The Amphidrome / The Birth of Professional Hockey (approx. 9.9 miles away); Historic Houghton (approx. 9.9 miles away); The First Finnish Newspaper in America (approx. 10 miles away); Trinity Episcopal Church (approx. 10.2 miles away). Touch for a list and map of all markers in Calumet.
 
Categories. Natural Resources
 
The Piece of Float Copper image. Click for full size.
By Mike Wintermantel, August 13, 2014
3. The Piece of Float Copper
Float Copper plaque image. Click for full size.
By Mike Wintermantel, August 13, 2014
4. Float Copper plaque
Lake Superior Float Copper
9392 LBS.
Donated for display
Coppertown USA
By
Joseph Lizzadro & Mary Sandretto Lizzadro
A permanent exhibit of the Lizzadro Museum of Lapidary Art
Elmhurst, Ill.
 
 
Credits. This page was last revised on August 29, 2018. This page originally submitted on August 16, 2014, by Mike Wintermantel of Pittsburgh, Pennsylvania. This page has been viewed 274 times since then and 43 times this year. Photos:   1, 2, 3, 4. submitted on August 16, 2014, by Mike Wintermantel of Pittsburgh, Pennsylvania.
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