Copper: Michigan Native Copper

Copper: Michigan Native Copper

Copper: Michigan Native Copper

Copper: Michigan Native Copper (closeup)

Copper: Michigan Native Copper (closeup)

Copper: Michigan Native Copper (reverse)

Copper: Michigan Native Copper (reverse, closeup)

Copper: Michigan Native Copper (with fact sheet)

Copper: Michigan Native Copper (fact sheet)


Copper: Michigan Native Copper

Keweenaw Peninsula

2026: Box #40 – Various Specimens

Michigan Native Copper Description:

Michigan’s Keweenaw Peninsula is the most important locality in the world for pure native copper. Mining began in 1845 and continued until 1968, and over 5 million tons of refined copper were recovered from Michigan’s copper mines. In the early 1900’s, it led the world in copper production, and “Lake Copper” was the purity standard to which other refined copper was compared.

Long before the mining operations of the past century began in Keweenaw, pre-historic peoples mined copper from the mineral-rich veins.

 

3.07 ounces

86.5 grams

432.5 carats

 

Unknown acquisition source and date

 

2026-40-Various Specimens

2026-40-10-

2026-40-



Copper: Michigan Native Copper

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