Copper
Unknown Owner
Help improve this recordNo owner is registered for this specimen yet. If it's yours or you know more about it, you can add the owner, provenance, publications and other details.
Crystallized native copper coming nicely off matrix. In good condition all around.The Central Mine in Keweenaw County, Michigan, was one of the major copper mining operations on the Keweenaw Peninsula and began production in 1854 after the discovery of rich native copper in amygdaloidal basalt of the Portage Lake Lava Series. Operated by the Central Mining Company, it became one of the leading producers in the region during the 1860s and 1870s, with extensive underground workings developed along the copper bearing lode. The mine produced native copper along with associated minerals such as calcite, quartz, and epidote. Production declined toward the end of the 19th century, and the mine closed in 1898, remaining an important part of Michigans copper mining history.
Product details
SpeciesCopper
SizeMiniature
Dimensions5.0 x 4.5 x 2.0 cm
Added on03/28/2026
LocalityUSA, Michigan, Central Mine
Known provenance
| Date | Collector | Acquisition price |
|---|---|---|
| 04/2026 | Unknown Owner | $50.00 |
| — | Weinrich Minerals | Not disclosed |
Learn more
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
Comments