Copper
Unknown Owner
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A loose branching nicely crystallized example of native copper. In good condition.The Cliff Mine in Keweenaw County, Michigan, was the first successful large scale copper mine on the Keweenaw Peninsula and began operations in 1845. It worked rich native copper deposits in fissure veins cutting basalt of the Portage Lake Lava Series and quickly became one of the most productive mines in the region during the mid 19th century. Extensive underground shafts and drifts were developed to follow the copper bearing lodes, and the mine helped establish the Michigan copper industry. Production declined later in the century, and the mine eventually closed in 1870, remaining an important part of early American mining history.
Product details
SpeciesCopper
SizeSmall Cabinet
Dimensions6.7 x 2.3 x 0.5 cm
Added on04/21/2026
LocalityUSA, Michigan, North Cliff Mine
Known provenance
| Date | Collector | Acquisition price |
|---|---|---|
| 04/2026 | Unknown Owner | $85.00 |
| — | Weinrich Minerals | Not disclosed |
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Mineral guide
Learn about Copper
native copper with spinel-twinned crystals and arborescences; notable from Lake Superior, Itauz, Dongchuan, Corocoro, prized for color and localities.Regional guide
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