Sterling Hill Mining Museum

For the 2026 to 2027 season, admission is $16 for adults 13 and over, $15 for seniors 65 and over, $14 for children 4 to 12 and $5 for children under 4. The gift shop, collecting and sluicing run 10am to 4pm daily, and guided mine tours run at 1pm on Saturdays and Sundays only.

Yes, on the designated Mine Run Dump as part of a visit. That is the legitimate way to take Franklin-Sterling Hill fluorescent material home. The surrounding mine property and the historic dumps elsewhere in the district are not open to casual collecting, and entering them is both illegal and dangerous.

An underground passage on the mine tour where ultraviolet light makes the walls fluoresce: willemite glows intense green, calcite glows red, and black franklinite provides the contrast. It is the most direct public demonstration of mineral fluorescence anywhere, and it is the reason most visitors book the guided underground tour.

Yes, in any season. The underground workings hold a steady cool temperature year round, so a summer visitor in shorts and a t-shirt will be uncomfortable within minutes of entering. Closed-toe shoes with grip are also worth wearing, because the tour route is a genuine mine floor rather than a museum corridor.

For 2026 to 2027, guided mine tours run weekends only, Saturday and Sunday at 1pm. Weekdays offer the gift shop, collecting and sluicing from 10am to 4pm but no underground tour. Private tours need at least 15 paying visitors and about two weeks' notice on 973-209-7212.

Because the ore body contains activator elements, particularly manganese, built into minerals such as willemite and calcite. Under ultraviolet light those activators absorb energy and re-emit it as visible light, producing willemite's intense green and calcite's red. The unusual chemistry of this single deposit is why the effect is so strong and so widespread here.

They are two separate sites a few minutes apart in the same ore district. Sterling Hill at Ogdensburg preserves an actual mine with an underground tour and the Rainbow Tunnel, plus the Mine Run Dump. The Franklin Mineral Museum in Franklin focuses on collections and has its own collecting dump. Many visitors do both in one day.

Not for the tour, where lighting is provided, but a shortwave ultraviolet lamp transforms dump collecting, because it lets you test rock on the spot rather than guessing. If you bring one, bring eye protection with it: shortwave UV is not the same as a party blacklight and emits UVC, which damages eyes and skin.

The district has produced over three hundred species and is the type locality, meaning the place a mineral was first described, for dozens of them. Hardystonite, which fluoresces violet-blue, is one example. That concentration in a single ore body is the reason the district is internationally significant to mineralogists.

Yes. The underground tour is a walking tour on a prepared path, the Rainbow Tunnel is genuinely spectacular, and sluicing and dump collecting give children something physical to do. Children 4 to 12 pay $14 and under 4 pay $5. Bring jackets for the cool underground temperature and closed-toe shoes for the mine floor.

Collectors who do both in a day usually recommend starting with the Sterling Hill underground tour, because seeing fluorescence in place underground gives you a reference for what you are hunting on the dumps afterwards. Since the Sterling Hill mine tour runs only at 1pm on weekends in the current schedule, planning the day around that fixed time and filling the rest with dump collecting at both sites is the arrangement people report working best.

The recurring point in discussions is that shortwave is what matters for this district: willemite and calcite respond dramatically to shortwave ultraviolet and much less to the longwave blacklights sold for parties. Collectors consistently warn that proper shortwave lamps emit UVC and need eye protection and care around skin, and that cheap lamps sold as shortwave often are not. Testing rock on site with a real lamp is described as the difference between a bucket of ore and a bucket of good specimens.

Trip reports generally say yes, with the caveat that you work for it. The dump is replenished and picked over in cycles, so surface material varies between visits, and people who report good results describe turning rock rather than scanning the top layer, and testing with a lamp rather than judging by daylight appearance. The realistic expectation is a handful of good fluorescent pieces rather than a museum specimen, which is a fair return for the admission price.