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Sterling Hill Mine
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| Location: | 30 Plant Street, Ogdensburg, New Jersey |
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| Architectural style: | Industrial |
| Governing body: | Sterling Hill Mining Museum |
| NRHP Reference#: | 91001365[1] |
| NJRHP #: | 2621[2] |
| Significant dates | |
| Added to NRHP: | September 3, 1991 |
| Designated NJRHP: | July 11, 1991 |
The Sterling Hill Mine, now known as the Sterling Hill Mining Museum, is a former iron and zinc mine in Ogdensburg, New Jersey. It was the last working underground mine in New Jersey when it closed in 1986. It became a museum in 1989. Along with the nearby Franklin Mine, it is known for its variety of minerals, especially the fluorescent varieties. It was added to the National Register of Historic Places on 1991.[1]
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Mining began at the site in 1730, when it was mistakenly thought to be a copper deposit.[3] George III of the United Kingdom granted the property to William Alexander, titled Lord Stirling. Stirling sold it to Robert Ogden in 1765. It went through several owners until the various mines were combined into the New Jersey Zinc Company in 1897. The mine closed in 1986 due to a tax dispute with the town, which foreclosed for back taxes in 1988 and auctioned the property to Richard and Robert Hauck for $750,000. It opened as a museum in August 1990.[4]
The ore bodies at the Sterling Hill mine lie within a formation called the Reading Prong massif; the ores are contained within the Franklin Marble.[5] This was deposited as limestone in a Precambrian oceanic rift trough.[6] It subsequently underwent extensive metamorphosis during the Grenville orogeny, approximately 1.15 billion years ago.[7] Uplift and erosion during the late Mesozoic and the Tertiary exposed the ore bodies at the surface; the glaciers of the Pleistocene strewed trains of ore-bearing bouldrs for miles to the south, in places creating deposits large enough to be worked profitably.[8]
In the area of the Franklin and Sterling Hill mines, 357 types of minerals are known to occur; these make up approximately 10% of the minerals known to science. Thirty-five of these minerals have not been found anywhere else.[9] Ninety-one of the minerals fluoresce.[10]
There are 35 miles (56 km) of tunnels in the mine, going down to 2,065 feet (629 m) below the surface on the main shaft and 2,675 feet (815 m) on the lower shaft. The mine remains at 56 °F (13 °C) constantly.
The tour spends about 30 minutes inside the Exhibit hall which contains a wide variety of mining memorabilia, mineralogical samples, fossils, and meteorites. It then leads into the mine for a 1,300 feet (400 m) walk on level ground through the underground mine.[3] [11] The walk goes through a new 240 feet (73 m) section called the Rainbow tunnel which they blasted in 1990 using 49 blasts and at a cost of $2 a foot.[4] In the Rainbow room, black lights are turned on to demonstrate the entire tunnel and various sample glowing with phosphorescence.
The mine is also home to the Ellis Astronomical Observatory, the Thomas S. Warren Museum of Fluorescence, and a collection of mining equipment.
The museum periodically arranges public mineral collecting sessions as well as more private and behind the scene events for local geology clubs.
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