Fissure Mines

Past ProducerCopperUSGS MRDS

Location

StateMichigan
CountyKeweenaw, Houghton, Ontonagon
Coordinates47.36750, -88.32310

Commodities

PrimaryCopper
SecondarySilver
TertiaryArsenic

Mine Details

StatusPast Producer
First Production1890
Discovery Year1845
Data SourceUSGS MRDS
Source ID10310197

What This Means

This mine is a past producer — it was once operational but is no longer actively mining. Past producer sites may still have environmental impacts including disturbed land, tailings piles, and potential water quality effects. Some past producer sites have been reclaimed, while others remain as-is. Check with your state mining or environmental agency for current site conditions.

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