Sterling Hill Mining Museum
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The Sterling Hill Mine, now known as the Sterling Hill Mining Museum, is a former zinc mine in the borough of Ogdensburg in Sussex County, New Jersey, United States. It was the last working undergroun
Sterling Hill Mining Museum, Visitor Center
The Sterling Mine information sign
Entrance to the Edison Tunnel
Main shaft access inside mine
Franklinite
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Franklinite is an oxide mineral belonging to the normal spinel subgroup's iron series, with the formula ZnFe3+2O4.
Franklinite (black) with Zincite (red)
A microscopic picture of Franklinite