The mine is home to over 350 different mineral species, many of which are found nowhere else on Earth.
Fluorescent minerals at this site emit vivid colors under shortwave ultraviolet light due to the presence of manganese.
The underground tour includes a demonstration of the 'Rainbow Tunnel,' where rock walls glow under UV lighting.
Sterling Hill was the last operating underground mine in New Jersey, closing its doors in 1986.
The site includes an extensive collection of historical mining machinery and original mine buildings.
The mine's unique geology was shaped by intense tectonic activity and chemical processes over one billion years ago.
The facility serves as a research site for international geologists and mineralogists.
The mine office and laboratory remain largely preserved as they were during the final years of operation.
The Sterling Hill Mining Museum is a former zinc mine located in the Franklin Marble belt, recognized for containing one of the world's most diverse concentrations of fluorescent minerals. Visitors tour the underground mine workings, which maintain a constant temperature of 56 degrees Fahrenheit year-round. The site features an extensive collection of mining equipment, geological specimens, and the Warren Museum of Fluorescence. The underground section spans over 35 miles of horizontal tunnels, though public access is restricted to safe, designated pathways. The mine operated commercially for over 150 years before transitioning into a museum and research facility. Geologists identify this area as the Zinc Capital of the World due to the unique ore body composition.
The fluorescent mineral display room under ultraviolet light.
Bring a sweatshirt or light jacket, as the underground mine tunnels remain cool regardless of the outside temperature.
Wear comfortable, closed-toe walking shoes to navigate uneven surfaces in the mine.
Arrive with plenty of camera battery life if you plan to photograph the fluorescent mineral displays.
Do not attempt to collect or take geological samples from the mine walls or surrounding grounds.
Tours typically follow a seasonal schedule; underground tours may be limited during winter months or extreme weather conditions.
Closed-toe shoes are mandatory for the underground tour; guests must stay with the guide at all times while in the mine.
